diff options
Diffstat (limited to 'source/blender/blenkernel/intern/particle_system.c')
| -rw-r--r-- | source/blender/blenkernel/intern/particle_system.c | 4371 |
1 files changed, 4371 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c new file mode 100644 index 00000000000..0bcf6be0a4a --- /dev/null +++ b/source/blender/blenkernel/intern/particle_system.c @@ -0,0 +1,4371 @@ +/* particle_system.c + * + * + * $Id: particle_system.c $ + * + * ***** BEGIN GPL/BL DUAL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. The Blender + * Foundation also sells licenses for use in proprietary software under + * the Blender License. See http://www.blender.org/BL/ for information + * about this. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The Original Code is Copyright (C) 2007 by Janne Karhu. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL/BL DUAL LICENSE BLOCK ***** + */ + +#include <stdlib.h> +#include <math.h> +#include <string.h> + +#include "MEM_guardedalloc.h" + +#include "DNA_particle_types.h" +#include "DNA_mesh_types.h" +#include "DNA_meshdata_types.h" +#include "DNA_modifier_types.h" +#include "DNA_object_force.h" +#include "DNA_object_types.h" +#include "DNA_material_types.h" +#include "DNA_ipo_types.h" +#include "DNA_curve_types.h" +#include "DNA_group_types.h" +#include "DNA_scene_types.h" +#include "DNA_texture_types.h" + +#include "BLI_rand.h" +#include "BLI_jitter.h" +#include "BLI_arithb.h" +#include "BLI_blenlib.h" +#include "BLI_kdtree.h" +#include "BLI_linklist.h" + +#include "BKE_anim.h" +#include "BKE_bad_level_calls.h" +#include "BKE_cdderivedmesh.h" +#include "BKE_displist.h" + +#include "BKE_particle.h" +#include "BKE_global.h" +#include "BKE_utildefines.h" +#include "BKE_DerivedMesh.h" +#include "BKE_object.h" +#include "BKE_material.h" +#include "BKE_ipo.h" +#include "BKE_softbody.h" +#include "BKE_depsgraph.h" +#include "BKE_lattice.h" +#include "BKE_pointcache.h" +#include "BKE_modifier.h" + +#include "BSE_headerbuttons.h" + +#include "blendef.h" + +#include "RE_shader_ext.h" + +/************************************************/ +/* Reacting to system events */ +/************************************************/ + +static int get_current_display_percentage(ParticleSystem *psys) +{ + ParticleSettings *part=psys->part; + + if(G.rendering || (part->child_nbr && part->childtype)) + return 100; + + if(part->phystype==PART_PHYS_KEYED){ + if(psys->flag & PSYS_FIRST_KEYED) + return psys->part->disp; + else + return 100; + } + else + return psys->part->disp; +} + +static void alloc_particles(ParticleSystem *psys, int new_totpart) +{ + ParticleData *newpars = 0, *pa; + int i, totpart, totsaved = 0; + + if(new_totpart<0){ + if(psys->part->distr==PART_DISTR_GRID){ + totpart= psys->part->grid_res; + totpart*=totpart*totpart; + } + else + totpart=psys->part->totpart; + } + else + totpart=new_totpart; + + if(totpart) + newpars= MEM_callocN(totpart*sizeof(ParticleData), "particles"); + if(psys->particles){ + totsaved=MIN2(psys->totpart,totpart); + /*save old pars*/ + if(totsaved) + memcpy(newpars,psys->particles,totsaved*sizeof(ParticleData)); + + for(i=totsaved, pa=psys->particles+totsaved; i<psys->totpart; i++, pa++) + if(pa->hair) MEM_freeN(pa->hair); + + MEM_freeN(psys->particles); + } + psys->particles=newpars; + + if(psys->part->child_nbr && psys->part->childtype){ + if(psys->child) + MEM_freeN(psys->child); + psys->child = NULL; + if(totpart) + psys->child= MEM_callocN(totpart*psys->part->child_nbr*sizeof(ChildParticle), "child_particles"); + psys->totchild=totpart*psys->part->child_nbr; + } + else if(psys->child){ + MEM_freeN(psys->child); + psys->child=0; + psys->totchild=0; + } + + psys->totpart=totpart; +} + +/* only run this if from == PART_FROM_FACE */ +static void psys_calc_dmfaces(Object *ob, DerivedMesh *dm, ParticleSystem *psys) +{ + /* use for building derived mesh face-origin info, + node - the allocated links - total derived mesh face count + node_array - is the array of nodes alligned with the base mesh's faces, so each original face can reference its derived faces + */ + Mesh *me= (Mesh*)ob->data; + ParticleData *pa= 0; + int p; + + /* CACHE LOCATIONS */ + if(!dm->deformedOnly) { + /* Will use later to speed up subsurf/derivedmesh */ + + int tot_dm_face = dm->getNumFaces(dm); + int totface = me->totface; + int *origindex = DM_get_face_data_layer(dm, CD_ORIGINDEX); + int i; + LinkNode *node, *node_dm_faces, **node_array; + + node_dm_faces = node = MEM_callocN(sizeof(LinkNode)*tot_dm_face, "faceindicies"); + node_array = MEM_callocN(sizeof(LinkNode *)*totface, "faceindicies array"); + + for(i=0; i < tot_dm_face; i++, origindex++, node++) { + node->link = (void *)i; // or use the index? + if(*origindex != -1) { + if(node_array[*origindex]) { + /* prepend */ + node->next = node_array[*origindex]; + node_array[*origindex] = node; + } else { + node_array[*origindex] = node; + } + } + } + + /* cache the faces! */ + + + for(p=0,pa=psys->particles; p<psys->totpart; p++,pa++) { + //i = pa->num; + //if (i<totface) // should never happen + i = psys_particle_dm_face_lookup(ob, dm, pa->num, pa->fuv, node_array[pa->num]); + pa->num_dmcache = i; + } + + //for (i=0; i < totface; i++) { + // i = psys_particle_dm_face_lookup(ob, dm, node_array[], fuv, (LinkNode*)NULL); + //} + MEM_freeN(node_array); + MEM_freeN(node_dm_faces); + + } else { + /* set the num_dmcache to an invalid value, just incase */ + /* TODO PARTICLE, make the following line unnecessary, each function should know to use the num or num_dmcache */ + + /* + for(p=0,pa=psys->particles; p<psys->totpart; p++,pa++) { + pa->num_dmcache = pa->num; + } + */ + for(p=0,pa=psys->particles; p<psys->totpart; p++,pa++) { + pa->num_dmcache = -1; + } + } +} + +static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) +{ + ParticleData *pa=0; + float min[3], max[3], delta[3], d; + MVert *mv, *mvert = dm->getVertDataArray(dm,0); + int totvert=dm->getNumVerts(dm), from=psys->part->from; + int i, j, k, p, res=psys->part->grid_res, size[3], axis; + + mv=mvert; + + /* find bounding box of dm */ + VECCOPY(min,mv->co); + VECCOPY(max,mv->co); + mv++; + + for(i=1; i<totvert; i++, mv++){ + min[0]=MIN2(min[0],mv->co[0]); + min[1]=MIN2(min[1],mv->co[1]); + min[2]=MIN2(min[2],mv->co[2]); + + max[0]=MAX2(max[0],mv->co[0]); + max[1]=MAX2(max[1],mv->co[1]); + max[2]=MAX2(max[2],mv->co[2]); + } + + VECSUB(delta,max,min); + + /* determine major axis */ + axis = (delta[0]>=delta[1])?0:((delta[1]>=delta[2])?1:2); + + d = delta[axis]/(float)res; + + size[axis]=res; + size[(axis+1)%3]=(int)ceil(delta[(axis+1)%3]/d); + size[(axis+2)%3]=(int)ceil(delta[(axis+2)%3]/d); + + /* float errors grrr.. */ + size[(axis+1)%3] = MIN2(size[(axis+1)%3],res); + size[(axis+2)%3] = MIN2(size[(axis+2)%3],res); + + min[0]+=d/2.0f; + min[1]+=d/2.0f; + min[2]+=d/2.0f; + + for(i=0,p=0,pa=psys->particles; i<res; i++){ + for(j=0; j<res; j++){ + for(k=0; k<res; k++,p++,pa++){ + pa->fuv[0]=min[0]+(float)i*d; + pa->fuv[1]=min[1]+(float)j*d; + pa->fuv[2]=min[2]+(float)k*d; + pa->flag |= PARS_UNEXIST; + pa->loop=0; /* abused in volume calculation */ + } + } + } + + /* enable particles near verts/edges/faces/inside surface */ + if(from==PART_FROM_VERT){ + float vec[3]; + + pa=psys->particles; + + min[0]-=d/2.0f; + min[1]-=d/2.0f; + min[2]-=d/2.0f; + + for(i=0,mv=mvert; i<totvert; i++,mv++){ + VecSubf(vec,mv->co,min); + vec[0]/=delta[0]; + vec[1]/=delta[1]; + vec[2]/=delta[2]; + (pa +((int)(vec[0]*(size[0]-1))*res + +(int)(vec[1]*(size[1]-1)))*res + +(int)(vec[2]*(size[2]-1)))->flag &= ~PARS_UNEXIST; + } + } + else if(ELEM(from,PART_FROM_FACE,PART_FROM_VOLUME)){ + float co1[3], co2[3]; + + MFace *mface=0; + float v1[3], v2[3], v3[3], v4[4], lambda; + int a, a1, a2, a0mul, a1mul, a2mul, totface; + int amax= from==PART_FROM_FACE ? 3 : 1; + + totface=dm->getNumFaces(dm); + mface=dm->getFaceDataArray(dm,CD_MFACE); + + for(a=0; a<amax; a++){ + if(a==0){ a0mul=res*res; a1mul=res; a2mul=1; } + else if(a==1){ a0mul=res; a1mul=1; a2mul=res*res; } + else{ a0mul=1; a1mul=res*res; a2mul=res; } + + for(a1=0; a1<size[(a+1)%3]; a1++){ + for(a2=0; a2<size[(a+2)%3]; a2++){ + mface=dm->getFaceDataArray(dm,CD_MFACE); + + pa=psys->particles + a1*a1mul + a2*a2mul; + VECCOPY(co1,pa->fuv); + co1[a]-=d/2.0f; + VECCOPY(co2,co1); + co2[a]+=delta[a] + 0.001f*d; + co1[a]-=0.001f*d; + + /* lets intersect the faces */ + for(i=0; i<totface; i++,mface++){ + VECCOPY(v1,mvert[mface->v1].co); + VECCOPY(v2,mvert[mface->v2].co); + VECCOPY(v3,mvert[mface->v3].co); + + if(AxialLineIntersectsTriangle(a,co1, co2, v2, v3, v1, &lambda)){ + if(from==PART_FROM_FACE) + (pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST; + else /* store number of intersections */ + (pa+(int)(lambda*size[a])*a0mul)->loop++; + } + + if(mface->v4){ + VECCOPY(v4,mvert[mface->v4].co); + + if(AxialLineIntersectsTriangle(a,co1, co2, v4, v1, v3, &lambda)){ + if(from==PART_FROM_FACE) + (pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST; + else + (pa+(int)(lambda*size[a])*a0mul)->loop++; + } + } + } + + if(from==PART_FROM_VOLUME){ + int in=pa->loop%2; + if(in) pa->loop++; + for(i=0; i<size[0]; i++){ + if(in || (pa+i*a0mul)->loop%2) + (pa+i*a0mul)->flag &= ~PARS_UNEXIST; + /* odd intersections == in->out / out->in */ + /* even intersections -> in stays same */ + in=(in + (pa+i*a0mul)->loop) % 2; + } + } + } + } + } + } + + if(psys->part->flag & PART_GRID_INVERT){ + for(i=0,pa=psys->particles; i<size[0]; i++){ + for(j=0; j<size[1]; j++){ + pa=psys->particles + res*(i*res + j); + for(k=0; k<size[2]; k++, pa++){ + pa->flag ^= PARS_UNEXIST; + } + } + } + } +} + +/* modified copy from effect.c */ +static void init_mv_jit(float *jit, int num, int seed2, float amount) +{ + RNG *rng; + float *jit2, x, rad1, rad2, rad3; + int i, num2; + + if(num==0) return; + + rad1= (float)(1.0/sqrt((float)num)); + rad2= (float)(1.0/((float)num)); + rad3= (float)sqrt((float)num)/((float)num); + + rng = rng_new(31415926 + num + seed2); + x= 0; + num2 = 2 * num; + for(i=0; i<num2; i+=2) { + + jit[i]= x + amount*rad1*(0.5f - rng_getFloat(rng)); + jit[i+1]= i/(2.0f*num) + amount*rad1*(0.5f - rng_getFloat(rng)); + + jit[i]-= (float)floor(jit[i]); + jit[i+1]-= (float)floor(jit[i+1]); + + x+= rad3; + x -= (float)floor(x); + } + + jit2= MEM_mallocN(12 + 2*sizeof(float)*num, "initjit"); + + for (i=0 ; i<4 ; i++) { + BLI_jitterate1(jit, jit2, num, rad1); + BLI_jitterate1(jit, jit2, num, rad1); + BLI_jitterate2(jit, jit2, num, rad2); + } + MEM_freeN(jit2); + rng_free(rng); +} + +static void psys_uv_to_w(float u, float v, int quad, float *w) +{ + float vert[4][3], co[3]; + + if(!quad) { + if(u+v > 1.0f) + v= 1.0f-v; + else + u= 1.0f-u; + } + + vert[0][0]= 0.0f; vert[0][1]= 0.0f; vert[0][2]= 0.0f; + vert[1][0]= 1.0f; vert[1][1]= 0.0f; vert[1][2]= 0.0f; + vert[2][0]= 1.0f; vert[2][1]= 1.0f; vert[2][2]= 0.0f; + + co[0]= u; + co[1]= v; + co[2]= 0.0f; + + if(quad) { + vert[3][0]= 0.0f; vert[3][1]= 1.0f; vert[3][2]= 0.0f; + MeanValueWeights(vert, 4, co, w); + } + else { + MeanValueWeights(vert, 3, co, w); + w[3]= 0.0f; + } +} + +static int binary_search_distribution(float *sum, int n, float value) +{ + int mid, low=0, high=n; + + while(low <= high) { + mid= (low + high)/2; + if(sum[mid] <= value && value <= sum[mid+1]) + return mid; + else if(sum[mid] > value) + high= mid - 1; + else if(sum[mid] < value) + low= mid + 1; + else + return mid; + } + + return low; +} + +/* creates a distribution of coordinates on a DerivedMesh */ +/* */ +/* 1. lets check from what we are emitting */ +/* 2. now we know that we have something to emit from so */ +/* let's calculate some weights */ +/* 2.1 from even distribution */ +/* 2.2 and from vertex groups */ +/* 3. next we determine the indexes of emitting thing that */ +/* the particles will have */ +/* 4. let's do jitter if we need it */ +/* 5. now we're ready to set the indexes & distributions to */ +/* the particles */ +/* 6. and we're done! */ + +/* This is to denote functionality that does not yet work with mesh - only derived mesh */ +#define ONLY_WORKING_WITH_PA_VERTS 0 +static void distribute_particles_on_dm(DerivedMesh *finaldm, Object *ob, ParticleSystem *psys, int from) +{ + Object *tob; + ParticleData *pa=0, *tpars=0, *tpa; + ParticleSettings *part; + ParticleSystem *tpsys; + ChildParticle *cpa=0; + KDTree *tree=0; + ParticleSeam *seams=0; + float *jit= NULL; + int p=0,i; + int no_distr=0, cfrom=0; + int tot=0, totpart, *index=0, children=0, totseam=0; + //int *vertpart=0; + int jitlevel= 1, intersect, distr; + float *weight=0,*sum=0,*jitoff=0; + float cur, maxweight=0.0,tweight; + float *v1, *v2, *v3, *v4, co[3], nor[3], co1[3], co2[3], nor1[3]; + float cur_d, min_d; + DerivedMesh *dm= NULL; + + if(ob==0 || psys==0 || psys->part==0) + return; + + part=psys->part; + totpart=psys->totpart; + if(totpart==0) + return; + + if (!finaldm->deformedOnly && !CustomData_has_layer( &finaldm->faceData, CD_ORIGINDEX ) ) { + error("Can't paint with the current modifier stack, disable destructive modifiers"); + return; + } + + BLI_srandom(31415926 + psys->seed); + + if(from==PART_FROM_CHILD){ + distr=PART_DISTR_RAND; + cpa=psys->child; + if(part->from!=PART_FROM_PARTICLE && part->childtype==PART_CHILD_FACES){ + dm= finaldm; + children=1; + + tree=BLI_kdtree_new(totpart); + + for(p=0,pa=psys->particles; p<totpart; p++,pa++){ + psys_particle_on_dm(ob,dm,part->from,pa->num,pa->num_dmcache,pa->fuv,pa->foffset,co,nor,0,0); + BLI_kdtree_insert(tree, p, co, nor); + } + + BLI_kdtree_balance(tree); + + totpart=psys->totchild; + cfrom=from=PART_FROM_FACE; + + if(part->flag&PART_CHILD_SEAMS){ + MEdge *ed, *medge=dm->getEdgeDataArray(dm,CD_MEDGE); + MVert *mvert=dm->getVertDataArray(dm,CD_MVERT); + int totedge=dm->getNumEdges(dm); + + for(p=0, ed=medge; p<totedge; p++,ed++) + if(ed->flag&ME_SEAM) + totseam++; + + if(totseam){ + ParticleSeam *cur_seam=seams=MEM_callocN(totseam*sizeof(ParticleSeam),"Child Distribution Seams"); + float temp[3],temp2[3]; + + for(p=0, ed=medge; p<totedge; p++,ed++){ + if(ed->flag&ME_SEAM){ + VecCopyf(cur_seam->v0,(mvert+ed->v1)->co); + VecCopyf(cur_seam->v1,(mvert+ed->v2)->co); + + VecSubf(cur_seam->dir,cur_seam->v1,cur_seam->v0); + + cur_seam->length2=VecLength(cur_seam->dir); + cur_seam->length2*=cur_seam->length2; + + temp[0]=(float)((mvert+ed->v1)->no[0]); + temp[1]=(float)((mvert+ed->v1)->no[1]); + temp[2]=(float)((mvert+ed->v1)->no[2]); + temp2[0]=(float)((mvert+ed->v2)->no[0]); + temp2[1]=(float)((mvert+ed->v2)->no[1]); + temp2[2]=(float)((mvert+ed->v2)->no[2]); + + VecAddf(cur_seam->nor,temp,temp2); + Normalize(cur_seam->nor); + + Crossf(cur_seam->tan,cur_seam->dir,cur_seam->nor); + + Normalize(cur_seam->tan); + + cur_seam++; + } + } + } + + } + } + else{ + /* no need to figure out distribution */ + for(i=0; i<part->child_nbr; i++){ + for(p=0; p<psys->totpart; p++,cpa++){ + float length=2.0; + cpa->parent=p; + + /* create even spherical distribution inside unit sphere */ + while(length>=1.0f){ + cpa->fuv[0]=2.0f*BLI_frand()-1.0f; + cpa->fuv[1]=2.0f*BLI_frand()-1.0f; + cpa->fuv[2]=2.0f*BLI_frand()-1.0f; + length=VecLength(cpa->fuv); + } + + cpa->rand[0]=BLI_frand(); + cpa->rand[1]=BLI_frand(); + cpa->rand[2]=BLI_frand(); + + cpa->num=-1; + } + } + + return; + } + } + else{ + dm= CDDM_from_mesh((Mesh*)ob->data, ob); + + /* special handling of grid distribution */ + if(part->distr==PART_DISTR_GRID){ + distribute_particles_in_grid(dm,psys); + dm->release(dm); + return; + } + + distr=part->distr; + pa=psys->particles; + if(from==PART_FROM_VERT){ + MVert *mv= dm->getVertDataArray(dm,0); + int totvert = dm->getNumVerts(dm); + + tree=BLI_kdtree_new(totvert); + + for(p=0; p<totvert; p++,mv++){ + VECCOPY(co,mv->co); + BLI_kdtree_insert(tree,p,co,NULL); + } + + BLI_kdtree_balance(tree); + } + } + + /* 1. */ + switch(from){ + case PART_FROM_VERT: + tot = dm->getNumVerts(dm); + break; + case PART_FROM_VOLUME: + case PART_FROM_FACE: + tot = dm->getNumFaces(dm); + break; + case PART_FROM_PARTICLE: + if(psys->target_ob) + tob=psys->target_ob; + else + tob=ob; + + if((tpsys=BLI_findlink(&tob->particlesystem,psys->target_psys-1))){ + tpars=tpsys->particles; + tot=tpsys->totpart; + } + break; + } + + if(tot==0){ + no_distr=1; + if(children){ + fprintf(stderr,"Particle child distribution error: Nothing to emit from!\n"); + for(p=0,cpa=psys->child; p<totpart; p++,cpa++){ + cpa->fuv[0]=cpa->fuv[1]=cpa->fuv[2]=cpa->fuv[3]= 0.0; + cpa->foffset= 0.0f; + cpa->parent=0; + cpa->pa[0]=cpa->pa[1]=cpa->pa[2]=cpa->pa[3]=0; + cpa->num= -1; + } + } + else { + fprintf(stderr,"Particle distribution error: Nothing to emit from!\n"); + for(p=0,pa=psys->particles; p<totpart; p++,pa++){ + pa->fuv[0]=pa->fuv[1]=pa->fuv[2]= pa->fuv[3]= 0.0; + pa->foffset= 0.0f; + pa->num= -1; + } + } + + if(dm != finaldm) dm->release(dm); + return; + } + + /* 2. */ + + weight=MEM_callocN(sizeof(float)*tot, "particle_distribution_weights"); + index=MEM_callocN(sizeof(int)*totpart, "particle_distribution_indexes"); + sum=MEM_callocN(sizeof(float)*(tot+1), "particle_distribution_sum"); + jitoff=MEM_callocN(sizeof(float)*tot, "particle_distribution_jitoff"); + + /* 2.1 */ + if((part->flag&PART_EDISTR || children) && ELEM(from,PART_FROM_PARTICLE,PART_FROM_VERT)==0){ + float totarea=0.0; + + for(i=0; i<tot; i++){ + MFace *mf=dm->getFaceData(dm,i,CD_MFACE); + MVert *mv1=dm->getVertData(dm,mf->v1,CD_MVERT); + MVert *mv2=dm->getVertData(dm,mf->v2,CD_MVERT); + MVert *mv3=dm->getVertData(dm,mf->v3,CD_MVERT); + + if (mf->v4){ + MVert *mv4=dm->getVertData(dm,mf->v4,CD_MVERT); + cur= AreaQ3Dfl(mv1->co,mv2->co,mv3->co,mv4->co); + } + else + cur= AreaT3Dfl(mv1->co,mv2->co,mv3->co); + + if(cur>maxweight) + maxweight=cur; + + weight[i]= cur; + totarea+=cur; + } + + for(i=0; i<tot; i++) + weight[i] /= totarea; + + maxweight /= totarea; + } + else if(from==PART_FROM_PARTICLE){ + float val=(float)tot/(float)totpart; + for(i=0; i<tot; i++) + weight[i]=val; + maxweight=val; + } + else{ + float min=1.0f/(float)(MIN2(tot,totpart)); + for(i=0; i<tot; i++) + weight[i]=min; + maxweight=min; + } + + /* 2.2 */ + if(ELEM3(from,PART_FROM_VERT,PART_FROM_FACE,PART_FROM_VOLUME)){ + float *vweight= psys_cache_vgroup(dm,psys,PSYS_VG_DENSITY); + + if(vweight){ + if(from==PART_FROM_VERT) { + for(i=0;i<tot; i++) + weight[i]*=vweight[i]; + } + else { /* PART_FROM_FACE / PART_FROM_VOLUME */ + for(i=0;i<tot; i++){ + MFace *mf=dm->getFaceData(dm,i,CD_MFACE); + tweight = vweight[mf->v1] + vweight[mf->v2] + vweight[mf->v3]; + + if(mf->v4) { + tweight += vweight[mf->v4]; + tweight /= 4.0; + } + else { + tweight /= 3.0; + } + + weight[i]*=tweight; + } + } + MEM_freeN(vweight); + } + } + + /* 3. */ + sum[0]= 0.0f; + for(i=0;i<tot; i++) + sum[i+1]= sum[i]+weight[i]; + + if(part->flag&PART_TRAND){ + float pos; + + for(p=0; p<totpart; p++) { + pos= BLI_frand(); + index[p]= binary_search_distribution(sum, tot, pos); + jitoff[index[p]]= pos; + } + } + else { + float step, pos; + + step= (totpart <= 1)? 0.5f: 1.0f/(totpart-1); + pos= 0.0f; + i= 0; + + for(p=0; p<totpart; p++, pos+=step) { + while((i < tot) && (pos > sum[i+1])) + i++; + + index[p]= MIN2(tot-1, i); + jitoff[index[p]]= pos; + } + } + + /* weights are no longer used except for FROM_PARTICLE, which needs them zeroed for indexing */ + if(from==PART_FROM_PARTICLE){ + for(i=0; i<tot; i++) + weight[i]=0.0f; + } + + /* 4. */ + if(distr==PART_DISTR_JIT && ELEM(from,PART_FROM_FACE,PART_FROM_VOLUME)) { + jitlevel= part->userjit; + + if(jitlevel == 0) { + jitlevel= totpart/tot; + if(part->flag & PART_EDISTR) jitlevel*= 2; /* looks better in general, not very scietific */ + if(jitlevel<3) jitlevel= 3; + //if(jitlevel>100) jitlevel= 100; + } + + jit= MEM_callocN(2+ jitlevel*2*sizeof(float), "jit"); + + init_mv_jit(jit, jitlevel, psys->seed, part->jitfac); + BLI_array_randomize(jit, 2*sizeof(float), jitlevel, psys->seed); /* for custom jit or even distribution */ + } + + /* 5. */ + if(children) from=PART_FROM_CHILD; + for(p=0,pa=psys->particles; p<totpart; p++,pa++,cpa++){ + switch(from){ + case PART_FROM_VERT: + /* TODO_PARTICLE - use original index */ + pa->num=index[p]; + pa->fuv[0] = 1.0f; + pa->fuv[1] = pa->fuv[2] = pa->fuv[3] = 0.0; + //pa->verts[0] = pa->verts[1] = pa->verts[2] = 0; + +#if ONLY_WORKING_WITH_PA_VERTS + if(tree){ + KDTreeNearest ptn[3]; + int w,maxw; + + psys_particle_on_dm(ob,dm,from,pa->num,pa->num_dmcache,pa->fuv,pa->foffset,co1,0,0,0); + maxw = BLI_kdtree_find_n_nearest(tree,3,co1,NULL,ptn); + + for(w=0; w<maxw; w++){ + pa->verts[w]=ptn->num; + } + } +#endif + break; + case PART_FROM_FACE: + case PART_FROM_VOLUME: + { + MFace *mface; + pa->num = i = index[p]; + mface = dm->getFaceData(dm,i,CD_MFACE); + + switch(distr){ + case PART_DISTR_JIT: + jitoff[i] = fmod(jitoff[i],(float)jitlevel); + psys_uv_to_w(jit[2*(int)jitoff[i]], jit[2*(int)jitoff[i]+1], mface->v4, pa->fuv); + jitoff[i]++; + //jitoff[i]=(float)fmod(jitoff[i]+maxweight/weight[i],(float)jitlevel); + break; + case PART_DISTR_RAND: + psys_uv_to_w(BLI_frand(), BLI_frand(), mface->v4, pa->fuv); + break; + } + pa->foffset= 0.0f; + + /* + pa->verts[0] = mface->v1; + pa->verts[1] = mface->v2; + pa->verts[2] = mface->v3; + */ + + /* experimental */ + if(from==PART_FROM_VOLUME){ + MVert *mvert=dm->getVertDataArray(dm,CD_MVERT); + + tot=dm->getNumFaces(dm); + + psys_interpolate_face(mvert,mface,0,pa->fuv,co1,nor,0,0); + + Normalize(nor); + VecMulf(nor,-100.0); + + VECADD(co2,co1,nor); + + min_d=2.0; + intersect=0; + + for(i=0,mface=dm->getFaceDataArray(dm,CD_MFACE); i<tot; i++,mface++){ + if(i==pa->num) continue; + + v1=mvert[mface->v1].co; + v2=mvert[mface->v2].co; + v3=mvert[mface->v3].co; + + if(LineIntersectsTriangle(co1, co2, v2, v3, v1, &cur_d, 0)){ + if(cur_d<min_d){ + min_d=cur_d; + pa->foffset=cur_d*50.0f; /* to the middle of volume */ + intersect=1; + } + } + if(mface->v4){ + v4=mvert[mface->v4].co; + + if(LineIntersectsTriangle(co1, co2, v4, v1, v3, &cur_d, 0)){ + if(cur_d<min_d){ + min_d=cur_d; + pa->foffset=cur_d*50.0f; /* to the middle of volume */ + intersect=1; + } + } + } + } + if(intersect==0) + pa->foffset=0.0; + else switch(distr){ + case PART_DISTR_JIT: + pa->foffset*= jit[2*(int)jitoff[i]]; + break; + case PART_DISTR_RAND: + pa->foffset*=BLI_frand(); + break; + } + } + break; + } + case PART_FROM_PARTICLE: + + //pa->verts[0]=0; /* not applicable */ + //pa->verts[1]=0; + //pa->verts[2]=0; + + tpa=tpars+index[p]; + pa->num=index[p]; + pa->fuv[0]=tpa->fuv[0]; + pa->fuv[1]=tpa->fuv[1]; + /* abusing foffset a little for timing in near reaction */ + pa->foffset=weight[index[p]]; + weight[index[p]]+=maxweight; + break; + case PART_FROM_CHILD: + if(index[p]>=0){ + MFace *mf; + + mf=dm->getFaceData(dm,index[p],CD_MFACE); + + //switch(distr){ + // case PART_DISTR_JIT: + // i=index[p]; + // psys_uv_to_w(jit[2*(int)jitoff[i]], jit[2*(int)jitoff[i]+1], mf->v4, cpa->fuv); + // jitoff[i]=(float)fmod(jitoff[i]+maxweight/weight[i],(float)jitlevel); + // break; + // case PART_DISTR_RAND: + psys_uv_to_w(BLI_frand(), BLI_frand(), mf->v4, cpa->fuv); + // break; + //} + + cpa->rand[0] = BLI_frand(); + cpa->rand[1] = BLI_frand(); + cpa->rand[2] = BLI_frand(); + cpa->num = index[p]; + + if(tree){ + KDTreeNearest ptn[10]; + int w,maxw, do_seams; + float maxd,mind,dd,totw=0.0; + int parent[10]; + float pweight[10]; + + do_seams= (part->flag&PART_CHILD_SEAMS && seams); + + psys_particle_on_dm(ob,dm,cfrom,cpa->num,DMCACHE_ISCHILD,cpa->fuv,cpa->foffset,co1,nor1,0,0); + maxw = BLI_kdtree_find_n_nearest(tree,(do_seams)?10:4,co1,nor1,ptn); + + maxd=ptn[maxw-1].dist; + mind=ptn[0].dist; + dd=maxd-mind; + + /* the weights here could be done better */ + for(w=0; w<maxw; w++){ + parent[w]=ptn[w].index; + pweight[w]=(float)pow(2.0,(double)(-6.0f*ptn[w].dist/maxd)); + //totw+=cpa->w[w]; + } + for(;w<10; w++){ + parent[w]=-1; + pweight[w]=0.0f; + } + if(do_seams){ + ParticleSeam *seam=seams; + float temp[3],temp2[3],tan[3]; + float inp,cur_len,min_len=10000.0f; + int min_seam=0, near_vert=0; + /* find closest seam */ + for(i=0; i<totseam; i++, seam++){ + VecSubf(temp,co1,seam->v0); + inp=Inpf(temp,seam->dir)/seam->length2; + if(inp<0.0f){ + cur_len=VecLenf(co1,seam->v0); + } + else if(inp>1.0f){ + cur_len=VecLenf(co1,seam->v1); + } + else{ + VecCopyf(temp2,seam->dir); + VecMulf(temp2,inp); + cur_len=VecLenf(temp,temp2); + } + if(cur_len<min_len){ + min_len=cur_len; + min_seam=i; + if(inp<0.0f) near_vert=-1; + else if(inp>1.0f) near_vert=1; + else near_vert=0; + } + } + seam=seams+min_seam; + + VecCopyf(temp,seam->v0); + + if(near_vert){ + if(near_vert==-1) + VecSubf(tan,co1,seam->v0); + else{ + VecSubf(tan,co1,seam->v1); + VecCopyf(temp,seam->v1); + } + + Normalize(tan); + } + else{ + VecCopyf(tan,seam->tan); + VecSubf(temp2,co1,temp); + if(Inpf(tan,temp2)<0.0f) + VecMulf(tan,-1.0f); + } + for(w=0; w<maxw; w++){ + VecSubf(temp2,ptn[w].co,temp); + if(Inpf(tan,temp2)<0.0f){ + parent[w]=-1; + pweight[w]=0.0f; + } + } + + } + + for(w=0,i=0; w<maxw && i<4; w++){ + if(parent[w]>=0){ + cpa->pa[i]=parent[w]; + cpa->w[i]=pweight[w]; + totw+=pweight[w]; + i++; + } + } + for(;i<4; i++){ + cpa->pa[i]=-1; + cpa->w[i]=0.0f; + } + + if(totw>0.0f) for(w=0; w<4; w++) + cpa->w[w]/=totw; + + cpa->parent=cpa->pa[0]; + } + } + else{ + cpa->num=0; + cpa->fuv[0]=cpa->fuv[1]=cpa->fuv[2]=cpa->fuv[3]=0.0f; + cpa->pa[0]=cpa->pa[1]=cpa->pa[2]=cpa->pa[3]=0; + cpa->rand[0]=cpa->rand[1]=cpa->rand[2]=0.0f; + } + break; + } + } + + /* 6. */ + if(jit) MEM_freeN(jit); + if(sum) MEM_freeN(sum); + if(jitoff) MEM_freeN(jitoff); + if(weight){ + MEM_freeN(weight); + weight=0; + } + if(index) MEM_freeN(index); + if(seams) MEM_freeN(seams); + //if(vertpart) MEM_freeN(vertpart); + BLI_kdtree_free(tree); + + if (from == PART_FROM_FACE) + psys_calc_dmfaces(ob, finaldm, psys); + + if(dm != finaldm) dm->release(dm); +} + +/* ready for future use, to emit particles without geometry */ +static void distribute_particles_on_shape(Object *ob, ParticleSystem *psys, int from) +{ + ParticleData *pa; + int totpart=psys->totpart, p; + + fprintf(stderr,"Shape emission not yet possible!\n"); + + for(p=0,pa=psys->particles; p<totpart; p++,pa++){ + pa->fuv[0]=pa->fuv[1]=pa->fuv[2]=pa->fuv[3]= 0.0; + pa->foffset= 0.0f; + pa->num= -1; + } +} +static void distribute_particles(Object *ob, ParticleSystem *psys, int from) +{ + ParticleSystemModifierData *psmd=0; + int distr_error=0; + psmd=psys_get_modifier(ob,psys); + + if(psmd){ + if(psmd->dm) + distribute_particles_on_dm(psmd->dm,ob,psys,from); + else + distr_error=1; + } + else + distribute_particles_on_shape(ob,psys,from); + + if(distr_error){ + ParticleData *pa; + int totpart=psys->totpart, p; + + fprintf(stderr,"Particle distribution error!\n"); + + for(p=0,pa=psys->particles; p<totpart; p++,pa++){ + pa->fuv[0]=pa->fuv[1]=pa->fuv[2]=pa->fuv[3]= 0.0; + pa->foffset= 0.0f; + pa->num= -1; + } + } +} +/* set particle parameters that don't change during particle's life */ +void initialize_particle(ParticleData *pa, int p, Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd) +{ + ParticleSettings *part; + ParticleTexture ptex; + Material *ma=0; + IpoCurve *icu=0; + int totpart; + float rand,length; + + part=psys->part; + + totpart=psys->totpart; + + ptex.life=ptex.size=ptex.exist=ptex.length=1.0; + ptex.time=(float)p/(float)totpart; + + BLI_srandom(psys->seed+p); + + if(part->from!=PART_FROM_PARTICLE){ + ma=give_current_material(ob,part->omat); + + /* TODO: needs some work to make most blendtypes generally usefull */ + psys_get_texture(ob,ma,psmd,psys,pa,&ptex,MAP_PA_INIT); + } + + pa->lifetime= part->lifetime*ptex.life; + + if(part->type==PART_HAIR) + pa->time=0.0f; + else if(part->type==PART_REACTOR && (part->flag&PART_REACT_STA_END)==0) + pa->time=MAXFRAMEF; + else{ + //icu=find_ipocurve(psys->part->ipo,PART_EMIT_TIME); + //if(icu){ + // calc_icu(icu,100*ptex.time); + // ptex.time=icu->curval; + //} + + pa->time= part->sta + (part->end - part->sta)*ptex.time; + } + + + if(part->type==PART_HAIR){ + pa->lifetime=100.0f; + } + else{ + icu=find_ipocurve(psys->part->ipo,PART_EMIT_LIFE); + if(icu){ + calc_icu(icu,100*ptex.time); + pa->lifetime*=icu->curval; + } + + /* need to get every rand even if we don't use them so that randoms don't affect eachother */ + rand= BLI_frand(); + if(part->randlife!=0.0) + pa->lifetime*= 1.0f - part->randlife*rand; + } + + pa->dietime= pa->time+pa->lifetime; + + pa->sizemul= BLI_frand(); + + rand= BLI_frand(); + + /* while loops are to have a spherical distribution (avoid cubic distribution) */ + length=2.0f; + while(length>1.0){ + pa->r_ve[0]=2.0f*(BLI_frand()-0.5f); + pa->r_ve[1]=2.0f*(BLI_frand()-0.5f); + pa->r_ve[2]=2.0f*(BLI_frand()-0.5f); + length=VecLength(pa->r_ve); + } + + length=2.0f; + while(length>1.0){ + pa->r_ave[0]=2.0f*(BLI_frand()-0.5f); + pa->r_ave[1]=2.0f*(BLI_frand()-0.5f); + pa->r_ave[2]=2.0f*(BLI_frand()-0.5f); + length=VecLength(pa->r_ave); + } + + pa->r_rot[0]=2.0f*(BLI_frand()-0.5f); + pa->r_rot[1]=2.0f*(BLI_frand()-0.5f); + pa->r_rot[2]=2.0f*(BLI_frand()-0.5f); + pa->r_rot[3]=2.0f*(BLI_frand()-0.5f); + + NormalQuat(pa->r_rot); + + if(part->distr!=PART_DISTR_GRID){ + /* any unique random number will do (r_ave[0]) */ + if(ptex.exist < 0.5*(1.0+pa->r_ave[0])) + pa->flag |= PARS_UNEXIST; + else + pa->flag &= ~PARS_UNEXIST; + } + + pa->loop=0; + /* we can't reset to -1 anymore since we've figured out correct index in distribute_particles */ + /* usage other than straight after distribute has to handle this index by itself - jahka*/ + //pa->num_dmcache = DMCACHE_NOTFOUND; /* assume we dont have a derived mesh face */ +} +static void initialize_all_particles(Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd) +{ + IpoCurve *icu=0; + ParticleData *pa; + int p, totpart=psys->totpart; + + for(p=0, pa=psys->particles; p<totpart; p++, pa++) + initialize_particle(pa,p,ob,psys,psmd); + + /* store the derived mesh face index for each particle */ + //if(psys->part->from==PART_FROM_FACE) + // psys_calc_dmfaces(ob, psmd->dm, psys); + + icu=find_ipocurve(psys->part->ipo,PART_EMIT_FREQ); + if(icu){ + float time=psys->part->sta, end=psys->part->end; + float v1, v2, a=0.0f, t1,t2, d; + + p=0; + pa=psys->particles; + + calc_icu(icu,time); + v1=icu->curval; + if(v1<0.0f) v1=0.0f; + + calc_icu(icu,time+1.0f); + v2=icu->curval; + if(v2<0.0f) v2=0.0f; + + for(p=0, pa=psys->particles; p<totpart && time<end; p++, pa++){ + while(a+0.5f*(v1+v2) < (float)(p+1) && time<end){ + a+=0.5f*(v1+v2); + v1=v2; + time++; + calc_icu(icu,time+1.0f); + v2=icu->curval; + } + if(time<end){ + if(v1==v2){ + pa->time=time+((float)(p+1)-a)/v1; + } + else{ + d=(float)sqrt(v1*v1-2.0f*(v2-v1)*(a-(float)(p+1))); + t1=(-v1+d)/(v2-v1); + t2=(-v1-d)/(v2-v1); + + /* the root between 0-1 is the correct one */ + if(t1>0.0f && t1<=1.0f) + pa->time=time+t1; + else + pa->time=time+t2; + } + } + + pa->dietime = pa->time+pa->lifetime; + pa->flag &= ~PARS_UNEXIST; + } + for(; p<totpart; p++, pa++){ + pa->flag |= PARS_UNEXIST; + } + } +} +/* sets particle to the emitter surface with initial velocity & rotation */ +void reset_particle(ParticleData *pa, ParticleSystem *psys, ParticleSystemModifierData *psmd, Object *ob, + float dtime, float cfra, float *vg_vel, float *vg_tan, float *vg_rot) +{ + ParticleSettings *part; + ParticleTexture ptex; + ParticleKey state; + IpoCurve *icu=0; + float fac, nor[3]={0,0,0},loc[3],tloc[3],vel[3]={0.0,0.0,0.0},rot[4],*q2=0; + float r_vel[3],r_ave[3],r_rot[4],p_vel[3]={0.0,0.0,0.0}; + float x_vec[3]={1.0,0.0,0.0}, utan[3]={0.0,1.0,0.0}, vtan[3]={0.0,0.0,1.0}; + + float q_one[4]={1.0,0.0,0.0,0.0}, q_phase[4]; + part=psys->part; + + ptex.ivel=1.0; + + if(part->from==PART_FROM_PARTICLE){ + Object *tob; + ParticleSystem *tpsys=0; + float speed; + + tob=psys->target_ob; + if(tob==0) + tob=ob; + + tpsys=BLI_findlink(&tob->particlesystem,psys->target_psys-1); + + /*TODO: get precise location of particle at birth*/ + + state.time=cfra; + psys_get_particle_state(tob,tpsys,pa->num,&state,1); + psys_get_from_key(&state,loc,nor,rot,0); + + QuatMulVecf(rot,vtan); + QuatMulVecf(rot,utan); + VECCOPY(r_vel,pa->r_ve); + VECCOPY(r_rot,pa->r_rot); + VECCOPY(r_ave,pa->r_ave); + + VECCOPY(p_vel,state.vel); + speed=Normalize(p_vel); + VecMulf(p_vel,Inpf(pa->r_ve,p_vel)); + VECSUB(p_vel,pa->r_ve,p_vel); + Normalize(p_vel); + VecMulf(p_vel,speed); + } + else{ + /* get precise emitter matrix if particle is born */ + if(part->type!=PART_HAIR && pa->time < cfra && pa->time >= psys->cfra) + where_is_object_time(ob,pa->time); + + /* get birth location from object */ + psys_particle_on_emitter(ob,psmd,part->from,pa->num, pa->num_dmcache, pa->fuv,pa->foffset,loc,nor,utan,vtan); + + /* save local coordinates for later */ + VECCOPY(tloc,loc); + + /* get possible textural influence */ + psys_get_texture(ob,give_current_material(ob,part->omat),psmd,psys,pa,&ptex,MAP_PA_IVEL); + + if(vg_vel){ + ptex.ivel*=psys_interpolate_value_from_verts(psmd->dm,part->from,pa->num,pa->fuv,vg_vel); + } + + /* particles live in global space so */ + /* let's convert: */ + /* -location */ + Mat4MulVecfl(ob->obmat,loc); + + /* -normal */ + VECADD(nor,tloc,nor); + Mat4MulVecfl(ob->obmat,nor); + VECSUB(nor,nor,loc); + Normalize(nor); + + /* -tangent */ + if(part->tanfac!=0.0){ + float phase=vg_rot?2.0f*(psys_interpolate_value_from_verts(psmd->dm,part->from,pa->num,pa->fuv,vg_rot)-0.5f):0.0f; + VecMulf(vtan,-(float)cos(M_PI*(part->tanphase+phase))); + fac=-(float)sin(M_PI*(part->tanphase+phase)); + VECADDFAC(vtan,vtan,utan,fac); + + VECADD(vtan,tloc,vtan); + Mat4MulVecfl(ob->obmat,vtan); + VECSUB(vtan,vtan,loc); + + VECCOPY(utan,nor); + VecMulf(utan,Inpf(vtan,nor)); + VECSUB(vtan,vtan,utan); + + Normalize(vtan); + } + + + /* -velocity */ + if(part->randfac!=0.0){ + VECADD(r_vel,tloc,pa->r_ve); + Mat4MulVecfl(ob->obmat,r_vel); + VECSUB(r_vel,r_vel,loc); + Normalize(r_vel); + } + + /* -angular velocity */ + if(part->avemode==PART_AVE_RAND){ + VECADD(r_ave,tloc,pa->r_ave); + Mat4MulVecfl(ob->obmat,r_ave); + VECSUB(r_ave,r_ave,loc); + Normalize(r_ave); + } + + /* -rotation */ + if(part->rotmode==PART_ROT_RAND){ + QUATCOPY(r_rot,pa->r_rot); + Mat4ToQuat(ob->obmat,rot); + QuatMul(r_rot,r_rot,rot); + } + } + /* conversion done so now we apply new: */ + /* -velocity from: */ + /* *emitter velocity */ + if(dtime!=0.0 && part->obfac!=0.0){ + VECSUB(vel,loc,pa->state.co); + VecMulf(vel,part->obfac/dtime); + } + + /* *emitter normal */ + if(part->normfac!=0.0) + VECADDFAC(vel,vel,nor,part->normfac); + + /* *emitter tangent */ + if(part->tanfac!=0.0) + VECADDFAC(vel,vel,vtan,part->tanfac*(vg_tan?psys_interpolate_value_from_verts(psmd->dm,part->from,pa->num,pa->fuv,vg_tan):1.0f)); + + /* *texture */ + /* TODO */ + + /* *random */ + if(part->randfac!=0.0) + VECADDFAC(vel,vel,r_vel,part->randfac); + + /* *particle */ + if(part->partfac!=0.0) + VECADDFAC(vel,vel,p_vel,part->partfac); + + icu=find_ipocurve(psys->part->ipo,PART_EMIT_VEL); + if(icu){ + calc_icu(icu,100*((pa->time-part->sta)/(part->end-part->sta))); + ptex.ivel*=icu->curval; + } + + VecMulf(vel,ptex.ivel); + + VECCOPY(pa->state.vel,vel); + + /* -location from emitter */ + VECCOPY(pa->state.co,loc); + + /* -rotation */ + pa->state.rot[0]=1.0; + pa->state.rot[1]=pa->state.rot[2]=pa->state.rot[3]=0.0; + + if(part->rotmode){ + switch(part->rotmode){ + case PART_ROT_NOR: + VecMulf(nor,-1.0); + q2= vectoquat(nor, OB_POSX, OB_POSZ); + VecMulf(nor,-1.0); + break; + case PART_ROT_VEL: + VecMulf(vel,-1.0); + q2= vectoquat(vel, OB_POSX, OB_POSZ); + VecMulf(vel,-1.0); + break; + case PART_ROT_RAND: + q2= r_rot; + break; + } + /* how much to rotate from rest position */ + QuatInterpol(rot,q_one,q2,part->rotfac); + + /* phase */ + VecRotToQuat(x_vec,part->phasefac*(float)M_PI,q_phase); + + /* combine amount & phase */ + QuatMul(pa->state.rot,rot,q_phase); + } + + /* -angular velocity */ + + pa->state.ave[0]=pa->state.ave[1]=pa->state.ave[2]=0.0; + + if(part->avemode){ + switch(part->avemode){ + case PART_AVE_SPIN: + VECCOPY(pa->state.ave,vel); + break; + case PART_AVE_RAND: + VECCOPY(pa->state.ave,r_ave); + break; + } + Normalize(pa->state.ave); + VecMulf(pa->state.ave,part->avefac); + + icu=find_ipocurve(psys->part->ipo,PART_EMIT_AVE); + if(icu){ + calc_icu(icu,100*((pa->time-part->sta)/(part->end-part->sta))); + VecMulf(pa->state.ave,icu->curval); + } + } + + pa->dietime=pa->time+pa->lifetime; + + if(pa->time >= cfra) + pa->alive=PARS_UNBORN; + + pa->state.time=cfra; + + pa->stick_ob=0; + pa->flag&=~PARS_STICKY; +} +static void reset_all_particles(Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd, float dtime, float cfra, int from) +{ + ParticleData *pa; + int p, totpart=psys->totpart; + float *vg_vel=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_VEL); + float *vg_tan=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_TAN); + float *vg_rot=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_ROT); + + //if (psys->part->from == PART_FROM_FACE) + // psys_calc_dmfaces(ob, psmd->dm, psys); + + for(p=from, pa=psys->particles+from; p<totpart; p++, pa++) + reset_particle(pa, psys, psmd, ob, dtime, cfra, vg_vel, vg_tan, vg_rot); + + if(vg_vel) + MEM_freeN(vg_vel); +} +/************************************************/ +/* Keyed particles */ +/************************************************/ +/* a bit of an unintuitive function :) counts objects in a keyed chain and returns 1 if some of them were selected (used in drawing) */ +int psys_count_keyed_targets(Object *ob, ParticleSystem *psys) +{ + ParticleSystem *kpsys=psys,*tpsys; + ParticleSettings *tpart; + Object *kob=ob,*tob; + int select=ob->flag&SELECT; + short totkeyed=0; + Base *base; + + ListBase lb; + lb.first=lb.last=0; + + tob=psys->keyed_ob; + while(tob){ + if((tpsys=BLI_findlink(&tob->particlesystem,kpsys->keyed_psys-1))){ + tpart=tpsys->part; + + if(tpart->phystype==PART_PHYS_KEYED){ + if(lb.first){ + for(base=lb.first;base;base=base->next){ + if(tob==base->object){ + fprintf(stderr,"Error: loop in keyed chain!\n"); + BLI_freelistN(&lb); + return select; + } + } + } + base=MEM_callocN(sizeof(Base), "keyed base"); + base->object=tob; + BLI_addtail(&lb,base); + + if(tob->flag&SELECT) + select++; + kob=tob; + kpsys=tpsys; + tob=tpsys->keyed_ob; + totkeyed++; + } + else{ + tob=0; + totkeyed++; + } + } + else + tob=0; + } + psys->totkeyed=totkeyed; + BLI_freelistN(&lb); + return select; +} +void set_keyed_keys(Object *ob, ParticleSystem *psys) +{ + Object *kob = ob; + ParticleSystem *kpsys = psys; + ParticleData *pa; + ParticleKey state; + int totpart = psys->totpart, i, k, totkeys = psys->totkeyed + 1; + float prevtime, nexttime, keyedtime; + + /* no proper targets so let's clear and bail out */ + if(psys->totkeyed==0){ + free_keyed_keys(psys); + psys->flag &= ~PSYS_KEYED; + return; + } + + if(totpart && psys->particles->totkey != totkeys){ + free_keyed_keys(psys); + + psys->particles->keys = MEM_callocN(psys->totpart * totkeys * sizeof(ParticleKey),"Keyed keys"); + + psys->particles->totkey = totkeys; + + for(i=1, pa=psys->particles+1; i<totpart; i++,pa++){ + pa->keys = (pa-1)->keys + totkeys; + pa->totkey = totkeys; + } + } + + psys->flag &= ~PSYS_KEYED; + state.time=-1.0; + + for(k=0; k<totkeys; k++){ + for(i=0,pa=psys->particles; i<totpart; i++, pa++){ + psys_get_particle_state(kob, kpsys, i%kpsys->totpart, pa->keys + k, 1); + + if(k==0) + pa->keys->time = pa->time; + else if(k==totkeys-1) + (pa->keys + k)->time = pa->time + pa->lifetime; + else{ + if(psys->flag & PSYS_KEYED_TIME){ + prevtime = (pa->keys + k - 1)->time; + nexttime = pa->time + pa->lifetime; + keyedtime = kpsys->part->keyed_time; + (pa->keys + k)->time = (1.0f - keyedtime) * prevtime + keyedtime * nexttime; + } + else + (pa->keys+k)->time = pa->time + (float)k / (float)(totkeys - 1) * pa->lifetime; + } + } + if(kpsys->keyed_ob){ + kob = kpsys->keyed_ob; + kpsys = BLI_findlink(&kob->particlesystem, kpsys->keyed_psys - 1); + } + } + + psys->flag |= PSYS_KEYED; +} +/************************************************/ +/* Reactors */ +/************************************************/ +static void push_reaction(Object* ob, ParticleSystem *psys, int pa_num, int event, ParticleKey *state) +{ + Object *rob; + ParticleSystem *rpsys; + ParticleSettings *rpart; + ParticleData *pa; + ListBase *lb=&psys->effectors; + ParticleEffectorCache *ec; + ParticleReactEvent *re; + + if(lb->first) for(ec = lb->first; ec; ec= ec->next){ + if(ec->type & PSYS_EC_REACTOR){ + /* all validity checks already done in add_to_effectors */ + rob=ec->ob; + rpsys=BLI_findlink(&rob->particlesystem,ec->psys_nbr); + rpart=rpsys->part; + if(rpsys->part->reactevent==event){ + pa=psys->particles+pa_num; + re= MEM_callocN(sizeof(ParticleReactEvent), "react event"); + re->event=event; + re->pa_num = pa_num; + re->ob = ob; + re->psys = psys; + re->size = pa->size; + copy_particle_key(&re->state,state,1); + + switch(event){ + case PART_EVENT_DEATH: + re->time=pa->dietime; + break; + case PART_EVENT_COLLIDE: + re->time=state->time; + break; + case PART_EVENT_NEAR: + re->time=state->time; + break; + } + + BLI_addtail(&rpsys->reactevents, re); + } + } + } +} +static void react_to_events(ParticleSystem *psys, int pa_num) +{ + ParticleSettings *part=psys->part; + ParticleData *pa=psys->particles+pa_num; + ParticleReactEvent *re=psys->reactevents.first; + int birth=0; + float dist=0.0f; + + for(re=psys->reactevents.first; re; re=re->next){ + birth=0; + if(part->from==PART_FROM_PARTICLE){ + if(pa->num==re->pa_num){ + if(re->event==PART_EVENT_NEAR){ + ParticleData *tpa = re->psys->particles+re->pa_num; + float pa_time=tpa->time + pa->foffset*tpa->lifetime; + if(re->time > pa_time){ + pa->alive=PARS_ALIVE; + pa->time=pa_time; + pa->dietime=pa->time+pa->lifetime; + } + } + else{ + if(pa->alive==PARS_UNBORN){ + pa->alive=PARS_ALIVE; + pa->time=re->time; + pa->dietime=pa->time+pa->lifetime; + } + } + } + } + else{ + dist=VecLenf(pa->state.co, re->state.co); + if(dist <= re->size){ + if(pa->alive==PARS_UNBORN){ + pa->alive=PARS_ALIVE; + pa->time=re->time; + pa->dietime=pa->time+pa->lifetime; + birth=1; + } + if(birth || part->flag&PART_REACT_MULTIPLE){ + float vec[3]; + VECSUB(vec,pa->state.co, re->state.co); + if(birth==0) + VecMulf(vec,(float)pow(1.0f-dist/re->size,part->reactshape)); + VECADDFAC(pa->state.vel,pa->state.vel,vec,part->reactfac); + VECADDFAC(pa->state.vel,pa->state.vel,re->state.vel,part->partfac); + } + if(birth) + VecMulf(pa->state.vel,(float)pow(1.0f-dist/re->size,part->reactshape)); + } + } + } +} +void psys_get_reactor_target(Object *ob, ParticleSystem *psys, Object **target_ob, ParticleSystem **target_psys) +{ + Object *tob; + + tob=psys->target_ob; + if(tob==0) + tob=ob; + + *target_psys=BLI_findlink(&tob->particlesystem,psys->target_psys-1); + if(*target_psys) + *target_ob=tob; + else + *target_ob=0; +} +/************************************************/ +/* Point Cache */ +/************************************************/ +void clear_particles_from_cache(Object *ob, ParticleSystem *psys, int cfra) +{ + ParticleSystemModifierData *psmd = psys_get_modifier(ob,psys); + int stack_index = modifiers_indexInObject(ob,(ModifierData*)psmd); + + BKE_ptcache_id_clear((ID *)ob, PTCACHE_CLEAR_ALL, cfra, stack_index); +} +static void write_particles_to_cache(Object *ob, ParticleSystem *psys, int cfra) +{ + FILE *fp = NULL; + ParticleSystemModifierData *psmd = psys_get_modifier(ob,psys); + ParticleData *pa; + int stack_index = modifiers_indexInObject(ob,(ModifierData*)psmd); + int i, totpart = psys->totpart; + + if(totpart == 0) return; + + fp = BKE_ptcache_id_fopen((ID *)ob, 'w', cfra, stack_index); + if(!fp) return; + + for(i=0, pa=psys->particles; i<totpart; i++, pa++) + fwrite(&pa->state, sizeof(ParticleKey), 1, fp); + + fclose(fp); +} +static int get_particles_from_cache(Object *ob, ParticleSystem *psys, int cfra) +{ + FILE *fp = NULL; + ParticleSystemModifierData *psmd = psys_get_modifier(ob,psys); + ParticleData *pa; + int stack_index = modifiers_indexInObject(ob,(ModifierData*)psmd); + int i, totpart = psys->totpart, ret = 1; + + if(totpart == 0) return 0; + + fp = BKE_ptcache_id_fopen((ID *)ob, 'r', cfra, stack_index); + if(!fp) + ret = 0; + else { + for(i=0, pa=psys->particles; i<totpart; i++, pa++) + if((fread(&pa->state, sizeof(ParticleKey), 1, fp)) != 1) { + ret = 0; + break; + } + + fclose(fp); + } + + return ret; +} +/************************************************/ +/* Effectors */ +/************************************************/ +static float effector_falloff(PartDeflect *pd, float *eff_velocity, float *vec_to_part) +{ + float eff_dir[3], temp[3]; + float falloff=1.0, fac, r_fac; + + VecCopyf(eff_dir,eff_velocity); + Normalize(eff_dir); + + if(pd->flag & PFIELD_POSZ && Inpf(eff_dir,vec_to_part)<0.0f) + falloff=0.0f; + else switch(pd->falloff){ + case PFIELD_FALL_SPHERE: + fac=VecLength(vec_to_part); + if(pd->flag&PFIELD_USEMAX && fac>pd->maxdist){ + falloff=0.0f; + break; + } + + if(pd->flag & PFIELD_USEMIN){ + if(fac>pd->mindist) + fac+=1.0f-pd->mindist; + else + fac=1.0f; + } + else if(fac<0.001) + fac=0.001f; + + falloff=1.0f/(float)pow((double)fac,(double)pd->f_power); + break; + + case PFIELD_FALL_TUBE: + fac=Inpf(vec_to_part,eff_dir); + if(pd->flag&PFIELD_USEMAX && ABS(fac)>pd->maxdist){ + falloff=0.0f; + break; + } + + VECADDFAC(temp,vec_to_part,eff_dir,-fac); + r_fac=VecLength(temp); + if(pd->flag&PFIELD_USEMAXR && r_fac>pd->maxrad){ + falloff=0.0f; + break; + } + + fac=ABS(fac); + + + if(pd->flag & PFIELD_USEMIN){ + if(fac>pd->mindist) + fac+=1.0f-pd->mindist; + else + fac=1.0f; + } + else if(fac<0.001) + fac=0.001f; + + if(pd->flag & PFIELD_USEMINR){ + if(r_fac>pd->minrad) + r_fac+=1.0f-pd->minrad; + else + r_fac=1.0f; + } + else if(r_fac<0.001) + r_fac=0.001f; + + falloff=1.0f/((float)pow((double)fac,(double)pd->f_power)*(float)pow((double)r_fac,(double)pd->f_power_r)); + + break; + case PFIELD_FALL_CONE: + fac=Inpf(vec_to_part,eff_dir); + if(pd->flag&PFIELD_USEMAX && ABS(fac)>pd->maxdist){ + falloff=0.0f; + break; + } + r_fac=saacos(fac/VecLength(vec_to_part))*180.0f/(float)M_PI; + if(pd->flag&PFIELD_USEMAXR && r_fac>pd->maxrad){ + falloff=0.0f; + break; + } + + if(pd->flag & PFIELD_USEMIN){ + if(fac>pd->mindist) + fac+=1.0f-pd->mindist; + else + fac=1.0f; + } + else if(fac<0.001) + fac=0.001f; + + if(pd->flag & PFIELD_USEMINR){ + if(r_fac>pd->minrad) + r_fac+=1.0f-pd->minrad; + else + r_fac=1.0f; + } + else if(r_fac<0.001) + r_fac=0.001f; + + falloff=1.0f/((float)pow((double)fac,(double)pd->f_power)*(float)pow((double)r_fac,(double)pd->f_power_r)); + + break; +// case PFIELD_FALL_INSIDE: + //for(i=0; i<totface; i++,mface++){ + // VECCOPY(v1,mvert[mface->v1].co); + // VECCOPY(v2,mvert[mface->v2].co); + // VECCOPY(v3,mvert[mface->v3].co); + + // if(AxialLineIntersectsTriangle(a,co1, co2, v2, v3, v1, &lambda)){ + // if(from==PART_FROM_FACE) + // (pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST; + // else /* store number of intersections */ + // (pa+(int)(lambda*size[a])*a0mul)->loop++; + // } + // + // if(mface->v4){ + // VECCOPY(v4,mvert[mface->v4].co); + + // if(AxialLineIntersectsTriangle(a,co1, co2, v4, v1, v3, &lambda)){ + // if(from==PART_FROM_FACE) + // (pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST; + // else + // (pa+(int)(lambda*size[a])*a0mul)->loop++; + // } + // } + //} + +// break; + } + + return falloff; +} +static void do_physical_effector(short type, float force_val, float distance, float falloff, float size, float damp, + float *eff_velocity, float *vec_to_part, float *velocity, float *field, int planar) +{ + float mag_vec[3]={0,0,0}; + float temp[3], temp2[3]; + float eff_vel[3]; + + VecCopyf(eff_vel,eff_velocity); + Normalize(eff_vel); + + switch(type){ + case PFIELD_WIND: + VECCOPY(mag_vec,eff_vel); + + VecMulf(mag_vec,force_val*falloff); + VecAddf(field,field,mag_vec); + break; + + case PFIELD_FORCE: + if(planar) + Projf(mag_vec,vec_to_part,eff_vel); + else + VecCopyf(mag_vec,vec_to_part); + + VecMulf(mag_vec,force_val*falloff); + VecAddf(field,field,mag_vec); + break; + + case PFIELD_VORTEX: + Crossf(mag_vec,eff_vel,vec_to_part); + Normalize(mag_vec); + + VecMulf(mag_vec,force_val*distance*falloff); + VecAddf(field,field,mag_vec); + + break; + case PFIELD_MAGNET: + if(planar) + VecCopyf(temp,eff_vel); + else + /* magnetic field of a moving charge */ + Crossf(temp,eff_vel,vec_to_part); + + Crossf(temp2,velocity,temp); + VecAddf(mag_vec,mag_vec,temp2); + + VecMulf(mag_vec,force_val*falloff); + VecAddf(field,field,mag_vec); + break; + case PFIELD_HARMONIC: + if(planar) + Projf(mag_vec,vec_to_part,eff_vel); + else + VecCopyf(mag_vec,vec_to_part); + + VecMulf(mag_vec,force_val*falloff); + VecSubf(field,field,mag_vec); + + VecCopyf(mag_vec,velocity); + /* 1.9 is an experimental value to get critical damping at damp=1.0 */ + VecMulf(mag_vec,damp*1.9f*(float)sqrt(force_val)); + VecSubf(field,field,mag_vec); + break; + case PFIELD_NUCLEAR: + /*pow here is root of cosine expression below*/ + //rad=(float)pow(2.0,-1.0/power)*distance/size; + //VECCOPY(mag_vec,vec_to_part); + //Normalize(mag_vec); + //VecMulf(mag_vec,(float)cos(3.0*M_PI/2.0*(1.0-1.0/(pow(rad,power)+1.0)))/(rad+0.2f)); + //VECADDFAC(field,field,mag_vec,force_val); + break; + } +} +static void do_texture_effector(Tex *tex, short mode, short is_2d, float nabla, short object, float *pa_co, float obmat[4][4], float force_val, float falloff, float *field) +{ + TexResult result[4]; + float tex_co[3], strength, mag_vec[3]; + int i; + + if(tex==0) return; + + for(i=0; i<4; i++) + result[i].nor=0; + + strength= force_val*falloff;///(float)pow((double)distance,(double)power); + + VECCOPY(tex_co,pa_co); + + if(is_2d){ + float fac=-Inpf(tex_co,obmat[2]); + VECADDFAC(tex_co,tex_co,obmat[2],fac); + } + + if(object){ + VecSubf(tex_co,tex_co,obmat[3]); + Mat4Mul3Vecfl(obmat,tex_co); + } + + multitex_ext(tex, tex_co, NULL,NULL, 1, result); + + if(mode==PFIELD_TEX_RGB){ + mag_vec[0]= (0.5f-result->tr)*strength; + mag_vec[1]= (0.5f-result->tg)*strength; + mag_vec[2]= (0.5f-result->tb)*strength; + } + else{ + strength/=nabla; + + tex_co[0]+= nabla; + multitex_ext(tex, tex_co, NULL,NULL, 1, result+1); + + tex_co[0]-= nabla; + tex_co[1]+= nabla; + multitex_ext(tex, tex_co, NULL,NULL, 1, result+2); + + tex_co[1]-= nabla; + tex_co[2]+= nabla; + multitex_ext(tex, tex_co, NULL,NULL, 1, result+3); + + if(mode==PFIELD_TEX_GRAD){ + mag_vec[0]= (result[0].tin-result[1].tin)*strength; + mag_vec[1]= (result[0].tin-result[2].tin)*strength; + mag_vec[2]= (result[0].tin-result[3].tin)*strength; + } + else{ /*PFIELD_TEX_CURL*/ + float dbdy,dgdz,drdz,dbdx,dgdx,drdy; + + dbdy= result[2].tb-result[0].tb; + dgdz= result[3].tg-result[0].tg; + drdz= result[3].tr-result[0].tr; + dbdx= result[1].tb-result[0].tb; + dgdx= result[1].tg-result[0].tg; + drdy= result[2].tr-result[0].tr; + + mag_vec[0]=(dbdy-dgdz)*strength; + mag_vec[1]=(drdz-dbdx)*strength; + mag_vec[2]=(dgdx-drdy)*strength; + } + } + + if(is_2d){ + float fac=-Inpf(mag_vec,obmat[2]); + VECADDFAC(mag_vec,mag_vec,obmat[2],fac); + } + + VecAddf(field,field,mag_vec); +} +static void add_to_effectors(ListBase *lb, Object *ob, Object *obsrc, ParticleSystem *psys) +{ + ParticleEffectorCache *ec; + PartDeflect *pd= ob->pd; + short type=0,i; + + if(pd && ob != obsrc){ + if(pd->forcefield == PFIELD_GUIDE) { + if(ob->type==OB_CURVE) { + Curve *cu= ob->data; + if(cu->flag & CU_PATH) { + if(cu->path==NULL || cu->path->data==NULL) + makeDispListCurveTypes(ob, 0); + if(cu->path && cu->path->data) { + type |= PSYS_EC_EFFECTOR; + } + } + } + } + else if(pd->forcefield) + type |= PSYS_EC_EFFECTOR; + } + + if(pd && pd->deflect) + type |= PSYS_EC_DEFLECT; + + if(type){ + ec= MEM_callocN(sizeof(ParticleEffectorCache), "effector cache"); + ec->ob= ob; + ec->type=type; + ec->distances=0; + ec->locations=0; + BLI_addtail(lb, ec); + } + + type=0; + + /* add particles as different effectors */ + if(ob->particlesystem.first){ + ParticleSystem *epsys=ob->particlesystem.first; + ParticleSettings *epart=0; + Object *tob; + + for(i=0; epsys; epsys=epsys->next,i++){ + type=0; + if(epsys!=psys){ + epart=epsys->part; + + if(epsys->part->pd && epsys->part->pd->forcefield) + type=PSYS_EC_PARTICLE; + + if(epart->type==PART_REACTOR) { + tob=epsys->target_ob; + if(tob==0) + tob=ob; + if(BLI_findlink(&tob->particlesystem,epsys->target_psys-1)==psys) + type|=PSYS_EC_REACTOR; + } + + if(type){ + ec= MEM_callocN(sizeof(ParticleEffectorCache), "effector cache"); + ec->ob= ob; + ec->type=type; + ec->psys_nbr=i; + BLI_addtail(lb, ec); + } + } + } + + } +} +void psys_init_effectors(Object *obsrc, Group *group, ParticleSystem *psys) +{ + ListBase *listb=&psys->effectors; + Base *base; + unsigned int layer= obsrc->lay; + + listb->first=listb->last=0; + + if(group) { + GroupObject *go; + + for(go= group->gobject.first; go; go= go->next) { + if( (go->ob->lay & layer) && (go->ob->pd || go->ob->particlesystem.first)) { + add_to_effectors(listb, go->ob, obsrc, psys); + } + } + } + else { + for(base = G.scene->base.first; base; base= base->next) { + if( (base->lay & layer) && (base->object->pd || base->object->particlesystem.first)) { + add_to_effectors(listb, base->object, obsrc, psys); + } + } + } +} + +void psys_end_effectors(ParticleSystem *psys) +{ + ListBase *lb=&psys->effectors; + if(lb->first) { + ParticleEffectorCache *ec; + for(ec= lb->first; ec; ec= ec->next){ + if(ec->distances) + MEM_freeN(ec->distances); + + if(ec->locations) + MEM_freeN(ec->locations); + + if(ec->face_minmax) + MEM_freeN(ec->face_minmax); + + if(ec->vert_cos) + MEM_freeN(ec->vert_cos); + + if(ec->tree) + BLI_kdtree_free(ec->tree); + } + + BLI_freelistN(lb); + } +} + +static void precalc_effectors(Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd) +{ + ListBase *lb=&psys->effectors; + ParticleEffectorCache *ec; + ParticleSettings *part=psys->part; + ParticleData *pa; + float vec2[3],loc[3],*co=0; + int p,totpart,totvert; + + for(ec= lb->first; ec; ec= ec->next) { + PartDeflect *pd= ec->ob->pd; + + if(ec->type==PSYS_EC_EFFECTOR && pd->forcefield==PFIELD_GUIDE && ec->ob->type==OB_CURVE + && part->phystype!=PART_PHYS_BOIDS) { + float vec[4]; + + where_on_path(ec->ob, 0.0, vec, vec2); + + Mat4MulVecfl(ec->ob->obmat,vec); + Mat4Mul3Vecfl(ec->ob->obmat,vec2); + + QUATCOPY(ec->firstloc,vec); + VECCOPY(ec->firstdir,vec2); + + totpart=psys->totpart; + + if(totpart){ + ec->distances=MEM_callocN(totpart*sizeof(float),"particle distances"); + ec->locations=MEM_callocN(totpart*3*sizeof(float),"particle locations"); + + for(p=0,pa=psys->particles; p<totpart; p++, pa++){ + psys_particle_on_emitter(ob,psmd,part->from,pa->num,pa->num_dmcache,pa->fuv,pa->foffset,loc,0,0,0); + Mat4MulVecfl(ob->obmat,loc); + ec->distances[p]=VecLenf(loc,vec); + VECSUB(loc,loc,vec); + VECCOPY(ec->locations+3*p,loc); + } + } + } + else if(ec->type==PSYS_EC_DEFLECT){ + DerivedMesh *dm; + MFace *mface=0; + MVert *mvert=0; + int i, totface; + float v1[3],v2[3],v3[3],v4[4], *min, *max; + + if(ob==ec->ob) + dm=psmd->dm; + else{ + psys_disable_all(ec->ob); + + dm=mesh_get_derived_final(ec->ob,0); + + psys_enable_all(ec->ob); + } + + if(dm){ + totvert=dm->getNumVerts(dm); + totface=dm->getNumFaces(dm); + mface=dm->getFaceDataArray(dm,CD_MFACE); + mvert=dm->getVertDataArray(dm,CD_MVERT); + + /* Decide which is faster to calculate by the amount of*/ + /* matrice multiplications needed to convert spaces. */ + /* With size deflect we have to convert allways because */ + /* the object can be scaled nonuniformly (sphere->ellipsoid). */ + if(totvert<2*psys->totpart || part->flag & PART_SIZE_DEFL){ + co=ec->vert_cos=MEM_callocN(sizeof(float)*3*totvert,"Particle deflection vert cos"); + /* convert vert coordinates to global (particle) coordinates */ + for(i=0; i<totvert; i++, co+=3){ + VECCOPY(co,mvert[i].co); + Mat4MulVecfl(ec->ob->obmat,co); + } + co=ec->vert_cos; + } + else + ec->vert_cos=0; + + INIT_MINMAX(ec->ob_minmax,ec->ob_minmax+3); + + min=ec->face_minmax=MEM_callocN(sizeof(float)*6*totface,"Particle deflection face minmax"); + max=min+3; + + for(i=0; i<totface; i++,mface++,min+=6,max+=6){ + if(co){ + VECCOPY(v1,co+3*mface->v1); + VECCOPY(v2,co+3*mface->v2); + VECCOPY(v3,co+3*mface->v3); + } + else{ + VECCOPY(v1,mvert[mface->v1].co); + VECCOPY(v2,mvert[mface->v2].co); + VECCOPY(v3,mvert[mface->v3].co); + } + INIT_MINMAX(min,max); + DO_MINMAX(v1,min,max); + DO_MINMAX(v2,min,max); + DO_MINMAX(v3,min,max); + + if(mface->v4){ + if(co){ + VECCOPY(v4,co+3*mface->v4); + } + else{ + VECCOPY(v4,mvert[mface->v4].co); + } + DO_MINMAX(v4,min,max); + } + + DO_MINMAX(min,ec->ob_minmax,ec->ob_minmax+3); + DO_MINMAX(max,ec->ob_minmax,ec->ob_minmax+3); + } + } + else + ec->face_minmax=0; + } + else if(ec->type==PSYS_EC_PARTICLE){ + if(psys->part->phystype==PART_PHYS_BOIDS){ + Object *eob = ec->ob; + ParticleSystem *epsys; + ParticleSettings *epart; + ParticleData *epa; + ParticleKey state; + PartDeflect *pd; + int totepart, p; + epsys= BLI_findlink(&eob->particlesystem,ec->psys_nbr); + epart= epsys->part; + pd= epart->pd; + totepart= epsys->totpart; + if(pd->forcefield==PFIELD_FORCE && totepart){ + KDTree *tree; + + tree=BLI_kdtree_new(totepart); + ec->tree=tree; + + for(p=0, epa=epsys->particles; p<totepart; p++,epa++) + if(epa->alive==PARS_ALIVE && psys_get_particle_state(eob,epsys,p,&state,0)) + BLI_kdtree_insert(tree, p, state.co, NULL); + + BLI_kdtree_balance(tree); + } + } + } + } +} + + +/* calculate forces that all effectors apply to a particle*/ +static void do_effectors(int pa_no, ParticleData *pa, ParticleKey *state, Object *ob, ParticleSystem *psys, float *force_field, float *vel,float framestep, float cfra) +{ + Object *eob; + ParticleSystem *epsys; + ParticleSettings *epart; + ParticleData *epa; + ParticleKey estate; + PartDeflect *pd; + ListBase *lb=&psys->effectors; + ParticleEffectorCache *ec; + float distance, vec_to_part[3]; + float falloff; + int p; + + /* check all effector objects for interaction */ + if(lb->first){ + for(ec = lb->first; ec; ec= ec->next){ + eob= ec->ob; + if(ec->type & PSYS_EC_EFFECTOR){ + pd=eob->pd; + if(psys->part->type!=PART_HAIR && psys->part->integrator) + where_is_object_time(eob,cfra); + /* Get IPO force strength and fall off values here */ + //if (has_ipo_code(eob->ipo, OB_PD_FSTR)) + // force_val = IPO_GetFloatValue(eob->ipo, OB_PD_FSTR, cfra); + //else + // force_val = pd->f_strength; + + //if (has_ipo_code(eob->ipo, OB_PD_FFALL)) + // ffall_val = IPO_GetFloatValue(eob->ipo, OB_PD_FFALL, cfra); + //else + // ffall_val = pd->f_power; + + //if (has_ipo_code(eob->ipo, OB_PD_FMAXD)) + // maxdist = IPO_GetFloatValue(eob->ipo, OB_PD_FMAXD, cfra); + //else + // maxdist = pd->maxdist; + + /* use center of object for distance calculus */ + //obloc= eob->obmat[3]; + VecSubf(vec_to_part, state->co, eob->obmat[3]); + distance = VecLength(vec_to_part); + + falloff=effector_falloff(pd,eob->obmat[2],vec_to_part); + + if(falloff<=0.0f) + ; /* don't do anything */ + else if(pd->forcefield==PFIELD_TEXTURE) + do_texture_effector(pd->tex, pd->tex_mode, pd->flag&PFIELD_TEX_2D, pd->tex_nabla, + pd->flag & PFIELD_TEX_OBJECT, state->co, eob->obmat, + pd->f_strength, falloff, force_field); + else + do_physical_effector(pd->forcefield,pd->f_strength,distance, + falloff,pd->f_dist,pd->f_damp,eob->obmat[2],vec_to_part, + pa->state.vel,force_field,pd->flag&PFIELD_PLANAR); + } + if(ec->type & PSYS_EC_PARTICLE){ + int totepart; + epsys= BLI_findlink(&eob->particlesystem,ec->psys_nbr); + epart= epsys->part; + pd= epart->pd; + totepart= epsys->totpart; + + if(pd->forcefield==PFIELD_HARMONIC){ + /* every particle is mapped to only one harmonic effector particle */ + p= pa_no%epsys->totpart; + totepart= p+1; + } + else{ + p=0; + } + + epsys->lattice=psys_get_lattice(ob,psys); + + for(; p<totepart; p++){ + epa = epsys->particles + p; + estate.time=-1.0; + if(psys_get_particle_state(eob,epsys,p,&estate,0)){ + VECSUB(vec_to_part, state->co, estate.co); + distance = VecLength(vec_to_part); + + //if(pd->forcefield==PFIELD_HARMONIC){ + // //if(cfra < epa->time + radius){ /* radius is fade-in in ui */ + // // eforce*=(cfra-epa->time)/radius; + // //} + //} + //else{ + // /* Limit minimum distance to effector particle so that */ + // /* the force is not too big */ + // if (distance < 0.001) distance = 0.001f; + //} + + falloff=effector_falloff(pd,estate.vel,vec_to_part); + + if(falloff<=0.0f) + ; /* don't do anything */ + else + do_physical_effector(pd->forcefield,pd->f_strength,distance, + falloff,epart->size,pd->f_damp,estate.vel,vec_to_part, + state->vel,force_field,0); + } + else if(pd->forcefield==PFIELD_HARMONIC && cfra-framestep <= epa->dietime && cfra>epa->dietime){ + /* first step after key release */ + psys_get_particle_state(eob,epsys,p,&estate,1); + VECADD(vel,vel,estate.vel); + /* TODO: add rotation handling here too */ + } + } + + if(epsys->lattice){ + end_latt_deform(); + epsys->lattice=0; + } + } + } + } +} + +/************************************************/ +/* Newtonian physics */ +/************************************************/ +/* gathers all forces that effect particles and calculates a new state for the particle */ +static void apply_particle_forces(int pa_no, ParticleData *pa, Object *ob, ParticleSystem *psys, ParticleSettings *part, float timestep, float dfra, float cfra, ParticleKey *state) +{ + ParticleKey states[5], tkey; + float force[3],tvel[3],dx[4][3],dv[4][3]; + float dtime=dfra*timestep, time, pa_mass=part->mass, fac, fra=psys->cfra; + int i, steps=1; + + /* maintain angular velocity */ + VECCOPY(state->ave,pa->state.ave); + + if(part->flag & PART_SIZEMASS) + pa_mass*=pa->size; + + switch(part->integrator){ + case PART_INT_EULER: + steps=1; + break; + case PART_INT_MIDPOINT: + steps=2; + break; + case PART_INT_RK4: + steps=4; + break; + } + + copy_particle_key(states,&pa->state,1); + + for(i=0; i<steps; i++){ + force[0]=force[1]=force[2]=0.0; + tvel[0]=tvel[1]=tvel[2]=0.0; + /* add effectors */ + do_effectors(pa_no,pa,states+i,ob,psys,force,tvel,dfra,fra); + + /* calculate air-particle interaction */ + if(part->dragfac!=0.0f){ + fac=-part->dragfac*pa->size*pa->size*VecLength(states[i].vel); + VECADDFAC(force,force,states[i].vel,fac); + } + + /* brownian force */ + if(part->brownfac!=0.0){ + force[0]+=(BLI_frand()-0.5f)*part->brownfac; + force[1]+=(BLI_frand()-0.5f)*part->brownfac; + force[2]+=(BLI_frand()-0.5f)*part->brownfac; + } + + /* force to acceleration*/ + VecMulf(force,1.0f/pa_mass); + + /* add global acceleration (gravitation) */ + VECADD(force,force,part->acc); + + //VecMulf(force,dtime); + + /* calculate next state */ + VECADD(states[i].vel,states[i].vel,tvel); + + //VecMulf(force,0.5f*dt); + switch(part->integrator){ + case PART_INT_EULER: + VECADDFAC(state->co,states->co,states->vel,dtime); + VECADDFAC(state->vel,states->vel,force,dtime); + break; + case PART_INT_MIDPOINT: + if(i==0){ + VECADDFAC(states[1].co,states->co,states->vel,dtime*0.5f); + VECADDFAC(states[1].vel,states->vel,force,dtime*0.5f); + fra=psys->cfra+0.5f*dfra; + } + else{ + VECADDFAC(state->co,states->co,states[1].vel,dtime); + VECADDFAC(state->vel,states->vel,force,dtime); + } + break; + case PART_INT_RK4: + switch(i){ + case 0: + VECCOPY(dx[0],states->vel); + VecMulf(dx[0],dtime); + VECCOPY(dv[0],force); + VecMulf(dv[0],dtime); + + VECADDFAC(states[1].co,states->co,dx[0],0.5f); + VECADDFAC(states[1].vel,states->vel,dv[0],0.5f); + fra=psys->cfra+0.5f*dfra; + break; + case 1: + VECADDFAC(dx[1],states->vel,dv[0],0.5f); + VecMulf(dx[1],dtime); + VECCOPY(dv[1],force); + VecMulf(dv[1],dtime); + + VECADDFAC(states[2].co,states->co,dx[1],0.5f); + VECADDFAC(states[2].vel,states->vel,dv[1],0.5f); + break; + case 2: + VECADDFAC(dx[2],states->vel,dv[1],0.5f); + VecMulf(dx[2],dtime); + VECCOPY(dv[2],force); + VecMulf(dv[2],dtime); + + VECADD(states[3].co,states->co,dx[2]); + VECADD(states[3].vel,states->vel,dv[2]); + fra=cfra; + break; + case 3: + VECADD(dx[3],states->vel,dv[2]); + VecMulf(dx[3],dtime); + VECCOPY(dv[3],force); + VecMulf(dv[3],dtime); + + VECADDFAC(state->co,states->co,dx[0],1.0f/6.0f); + VECADDFAC(state->co,state->co,dx[1],1.0f/3.0f); + VECADDFAC(state->co,state->co,dx[2],1.0f/3.0f); + VECADDFAC(state->co,state->co,dx[3],1.0f/6.0f); + + VECADDFAC(state->vel,states->vel,dv[0],1.0f/6.0f); + VECADDFAC(state->vel,state->vel,dv[1],1.0f/3.0f); + VECADDFAC(state->vel,state->vel,dv[2],1.0f/3.0f); + VECADDFAC(state->vel,state->vel,dv[3],1.0f/6.0f); + } + break; + } + //VECADD(states[i+1].co,states[i+1].co,force); + } + + /* damp affects final velocity */ + if(part->dampfac!=0.0) + VecMulf(state->vel,1.0f-part->dampfac); + + /* finally we do guides */ + time=(cfra-pa->time)/pa->lifetime; + CLAMP(time,0.0,1.0); + + VECCOPY(tkey.co,state->co); + VECCOPY(tkey.vel,state->vel); + tkey.time=state->time; + if(do_guide(&tkey,pa_no,time,&psys->effectors)){ + VECCOPY(state->co,tkey.co); + /* guides don't produce valid velocity */ + VECSUB(state->vel,tkey.co,pa->state.co); + VecMulf(state->vel,1.0f/dtime); + state->time=tkey.time; + } +} +static void rotate_particle(ParticleSettings *part, ParticleData *pa, float dfra, float timestep, ParticleKey *state) +{ + float rotfac, rot1[4], rot2[4]={1.0,0.0,0.0,0.0}, dtime=dfra*timestep; + + if((part->flag & PART_ROT_DYN)==0){ + if(ELEM(part->avemode,PART_AVE_SPIN,PART_AVE_VEL)){ + float angle; + float len1 = VecLength(pa->state.vel); + float len2 = VecLength(state->vel); + + if(len1==0.0f || len2==0.0f) + state->ave[0]=state->ave[1]=state->ave[2]=0.0f; + else{ + Crossf(state->ave,pa->state.vel,state->vel); + Normalize(state->ave); + angle=Inpf(pa->state.vel,state->vel)/(len1*len2); + VecMulf(state->ave,saacos(angle)/dtime); + } + } + + if(part->avemode == PART_AVE_SPIN) + VecRotToQuat(state->vel,dtime*part->avefac,rot2); + } + + rotfac=VecLength(state->ave); + if(rotfac==0.0){ /* QuatOne (in VecRotToQuat) doesn't give unit quat [1,0,0,0]?? */ + rot1[0]=1.0; + rot1[1]=rot1[2]=rot1[3]=0; + } + else{ + VecRotToQuat(state->ave,rotfac*dtime,rot1); + } + QuatMul(state->rot,rot1,pa->state.rot); + QuatMul(state->rot,rot2,state->rot); + + /* keep rotation quat in good health */ + NormalQuat(state->rot); +} + +/* convert from triangle barycentric weights to quad mean value weights */ +static void intersect_dm_quad_weights(float *v1, float *v2, float *v3, float *v4, float *w) +{ + float co[3], vert[4][3]; + + VECCOPY(vert[0], v1); + VECCOPY(vert[1], v2); + VECCOPY(vert[2], v3); + VECCOPY(vert[3], v4); + + co[0]= v1[0]*w[0] + v2[0]*w[1] + v3[0]*w[2] + v4[0]*w[3]; + co[1]= v1[1]*w[0] + v2[1]*w[1] + v3[1]*w[2] + v4[1]*w[3]; + co[2]= v1[2]*w[0] + v2[2]*w[1] + v3[2]*w[2] + v4[2]*w[3]; + + MeanValueWeights(vert, 4, co, w); +} + +/* check intersection with a derivedmesh */ +int psys_intersect_dm(Object *ob, DerivedMesh *dm, float *vert_cos, float *co1, float* co2, float *min_d, int *min_face, float *min_w, + float *face_minmax, float *pa_minmax, float radius, float *ipoint) +{ + MFace *mface=0; + MVert *mvert=0; + int i, totface, intersect=0; + float cur_d, cur_uv[2], v1[3], v2[3], v3[3], v4[3], min[3], max[3], p_min[3],p_max[3]; + float cur_ipoint[3]; + + if(dm==0){ + psys_disable_all(ob); + + dm=mesh_get_derived_final(ob,0); + if(dm==0) + mesh_get_derived_deform(ob,0); + + psys_enable_all(ob); + + if(dm==0) + return 0; + } + + + + if(pa_minmax==0){ + INIT_MINMAX(p_min,p_max); + DO_MINMAX(co1,p_min,p_max); + DO_MINMAX(co2,p_min,p_max); + } + else{ + VECCOPY(p_min,pa_minmax); + VECCOPY(p_max,pa_minmax+3); + } + + totface=dm->getNumFaces(dm); + mface=dm->getFaceDataArray(dm,CD_MFACE); + mvert=dm->getVertDataArray(dm,CD_MVERT); + + /* lets intersect the faces */ + for(i=0; i<totface; i++,mface++){ + if(vert_cos){ + VECCOPY(v1,vert_cos+3*mface->v1); + VECCOPY(v2,vert_cos+3*mface->v2); + VECCOPY(v3,vert_cos+3*mface->v3); + if(mface->v4) + VECCOPY(v4,vert_cos+3*mface->v4) + } + else{ + VECCOPY(v1,mvert[mface->v1].co); + VECCOPY(v2,mvert[mface->v2].co); + VECCOPY(v3,mvert[mface->v3].co); + if(mface->v4) + VECCOPY(v4,mvert[mface->v4].co) + } + + if(face_minmax==0){ + INIT_MINMAX(min,max); + DO_MINMAX(v1,min,max); + DO_MINMAX(v2,min,max); + DO_MINMAX(v3,min,max); + if(mface->v4) + DO_MINMAX(v4,min,max) + if(AabbIntersectAabb(min,max,p_min,p_max)==0) + continue; + } + else{ + VECCOPY(min, face_minmax+6*i); + VECCOPY(max, face_minmax+6*i+3); + if(AabbIntersectAabb(min,max,p_min,p_max)==0) + continue; + } + + if(radius>0.0f){ + if(SweepingSphereIntersectsTriangleUV(co1, co2, radius, v2, v3, v1, &cur_d, cur_ipoint)){ + if(cur_d<*min_d){ + *min_d=cur_d; + VECCOPY(ipoint,cur_ipoint); + *min_face=i; + intersect=1; + } + } + if(mface->v4){ + if(SweepingSphereIntersectsTriangleUV(co1, co2, radius, v4, v1, v3, &cur_d, cur_ipoint)){ + if(cur_d<*min_d){ + *min_d=cur_d; + VECCOPY(ipoint,cur_ipoint); + *min_face=i; + intersect=1; + } + } + } + } + else{ + if(LineIntersectsTriangle(co1, co2, v1, v2, v3, &cur_d, cur_uv)){ + if(cur_d<*min_d){ + *min_d=cur_d; + min_w[0]= 1.0 - cur_uv[0] - cur_uv[1]; + min_w[1]= cur_uv[0]; + min_w[2]= cur_uv[1]; + min_w[3]= 0.0f; + if(mface->v4) + intersect_dm_quad_weights(v1, v2, v3, v4, min_w); + *min_face=i; + intersect=1; + } + } + if(mface->v4){ + if(LineIntersectsTriangle(co1, co2, v1, v3, v4, &cur_d, cur_uv)){ + if(cur_d<*min_d){ + *min_d=cur_d; + min_w[0]= 1.0 - cur_uv[0] - cur_uv[1]; + min_w[1]= 0.0f; + min_w[2]= cur_uv[0]; + min_w[3]= cur_uv[1]; + intersect_dm_quad_weights(v1, v2, v3, v4, min_w); + *min_face=i; + intersect=1; + } + } + } + } + } + return intersect; +} +/* particle - mesh collision code */ +/* in addition to basic point to surface collisions handles friction & damping,*/ +/* angular momentum <-> linear momentum and swept sphere - mesh collisions */ +/* 1. check for all possible deflectors for closest intersection on particle path */ +/* 2. if deflection was found kill the particle or calculate new coordinates */ +static void deflect_particle(Object *pob, ParticleSystemModifierData *psmd, ParticleSystem *psys, ParticleSettings *part, ParticleData *pa, int p, float dfra, float cfra, ParticleKey *state, int *pa_die){ + Object *ob, *min_ob; + MFace *mface; + MVert *mvert; + DerivedMesh *dm; + ListBase *lb=&psys->effectors; + ParticleEffectorCache *ec; + ParticleKey cstate; + float imat[4][4]; + float co1[3],co2[3],def_loc[3],def_nor[3],unit_nor[3],def_tan[3],dvec[3],def_vel[3],dave[3],dvel[3]; + float pa_minmax[6]; + float min_w[4], zerovec[3]={0.0,0.0,0.0}, ipoint[3]; + float min_d,dotprod,damp,frict,o_len,d_len,radius=-1.0f; + int min_face=0, intersect=1, through=0; + short deflections=0, global=0; + + VECCOPY(def_loc,pa->state.co); + VECCOPY(def_vel,pa->state.vel); + + /* 10 iterations to catch multiple deflections */ + if(lb->first) while(deflections<10){ + intersect=0; + global=0; + min_d=20000.0; + min_ob=NULL; + /* 1. */ + for(ec=lb->first; ec; ec=ec->next){ + if(ec->type & PSYS_EC_DEFLECT){ + ob= ec->ob; + + if(part->type!=PART_HAIR) + where_is_object_time(ob,cfra); + + if(ob==pob){ + dm=psmd->dm; + /* particles should not collide with emitter at birth */ + if(pa->time < cfra && pa->time >= psys->cfra) + continue; + } + else + dm=0; + + VECCOPY(co1,def_loc); + VECCOPY(co2,state->co); + + if(ec->vert_cos==0){ + /* convert particle coordinates to object coordinates */ + Mat4Invert(imat,ob->obmat); + + Mat4MulVecfl(imat,co1); + Mat4MulVecfl(imat,co2); + } + + INIT_MINMAX(pa_minmax,pa_minmax+3); + DO_MINMAX(co1,pa_minmax,pa_minmax+3); + DO_MINMAX(co2,pa_minmax,pa_minmax+3); + if(part->flag&PART_SIZE_DEFL){ + pa_minmax[0]-=pa->size; + pa_minmax[1]-=pa->size; + pa_minmax[2]-=pa->size; + pa_minmax[3]+=pa->size; + pa_minmax[4]+=pa->size; + pa_minmax[5]+=pa->size; + + radius=pa->size; + } + + if(ec->face_minmax==0 || AabbIntersectAabb(pa_minmax,pa_minmax+3,ec->ob_minmax,ec->ob_minmax+3)) + if(psys_intersect_dm(ob,dm,ec->vert_cos,co1,co2,&min_d,&min_face,min_w, + ec->face_minmax,pa_minmax,radius,ipoint)){ + min_ob=ob; + if(ec->vert_cos) + global=1; + else + global=0; + } + } + } + + /* 2. */ + if(min_ob){ + BLI_srandom((int)cfra+p); + ob=min_ob; + + if(ob==pob){ + dm=psmd->dm; + } + else{ + psys_disable_all(ob); + + dm=mesh_get_derived_final(ob,0); + + psys_enable_all(ob); + } + + mface=dm->getFaceDataArray(dm,CD_MFACE); + mface+=min_face; + mvert=dm->getVertDataArray(dm,CD_MVERT); + + + /* permeability check */ + if(BLI_frand()<ob->pd->pdef_perm) + through=1; + else + through=0; + + if(through==0 && (part->flag & PART_DIE_ON_COL || ob->pd->flag & PDEFLE_KILL_PART)){ + pa->dietime = cfra-(1.0f-min_d)*dfra; + VecLerpf(def_loc,co1,co2,min_d); + + if(global==0) + Mat4MulVecfl(ob->obmat,def_loc); + + VECCOPY(state->co,def_loc); + VecLerpf(state->vel,pa->state.vel,state->vel,min_d); + QuatInterpol(state->rot,pa->state.rot,state->rot,min_d); + VecLerpf(state->ave,pa->state.ave,state->ave,min_d); + + *pa_die=1; + + /* particle is dead so we don't need to calculate further */ + deflections=10; + + /* store for reactors */ + copy_particle_key(&cstate,state,0); + + if(part->flag & PART_STICKY){ + pa->stick_ob=ob; + pa->flag |= PARS_STICKY; + //stick_particle_to_object(ob,pa,state); + } + } + else{ + VecLerpf(def_loc,co1,co2,min_d); + + if(radius>0.0f){ + VECSUB(unit_nor,def_loc,ipoint); + } + else{ + /* get deflection point & normal */ + psys_interpolate_face(mvert,mface,0,min_w,ipoint,unit_nor,0,0); + if(global){ + Mat4Mul3Vecfl(ob->obmat,unit_nor); + Mat4MulVecfl(ob->obmat,ipoint); + } + } + + Normalize(unit_nor); + + VECSUB(dvec,co1,co2); + /* scale to remaining length after deflection */ + VecMulf(dvec,1.0f-min_d); + + /* flip normal to face particle */ + if(Inpf(unit_nor,dvec)<0.0f) + VecMulf(unit_nor,-1.0f); + + /* store for easy velocity calculation */ + o_len=VecLength(dvec); + + /* project particle movement to normal & create tangent */ + dotprod=Inpf(dvec,unit_nor); + VECCOPY(def_nor,unit_nor); + VecMulf(def_nor,dotprod); + VECSUB(def_tan,def_nor,dvec); + + damp=ob->pd->pdef_damp+ob->pd->pdef_rdamp*2*(BLI_frand()-0.5f); + + /* create location after deflection */ + VECCOPY(dvec,def_nor); + damp=ob->pd->pdef_damp+ob->pd->pdef_rdamp*2*(BLI_frand()-0.5f); + CLAMP(damp,0.0,1.0); + VecMulf(dvec,1.0f-damp); + if(through) + VecMulf(dvec,-1.0); + + frict=ob->pd->pdef_frict+ob->pd->pdef_rfrict*2.0f*(BLI_frand()-0.5f); + CLAMP(frict,0.0,1.0); + VECADDFAC(dvec,dvec,def_tan,1.0f-frict); + + /* store for easy velocity calculation */ + d_len=VecLength(dvec); + + /* just to be sure we don't hit the current face again */ + if(through){ + VECADDFAC(ipoint,ipoint,unit_nor,-0.0001f); + VECADDFAC(def_loc,def_loc,unit_nor,-0.0001f); + + if(part->flag & PART_ROT_DYN){ + VECADDFAC(def_tan,def_tan,unit_nor,-0.0001f); + VECADDFAC(def_nor,def_nor,unit_nor,-0.0001f); + } + } + else{ + VECADDFAC(ipoint,ipoint,unit_nor,0.0001f); + VECADDFAC(def_loc,def_loc,unit_nor,0.0001f); + + if(part->flag & PART_ROT_DYN){ + VECADDFAC(def_tan,def_tan,unit_nor,0.0001f); + VECADDFAC(def_nor,def_nor,unit_nor,0.0001f); + } + } + + /* lets get back to global space */ + if(global==0){ + Mat4Mul3Vecfl(ob->obmat,dvec); + Mat4MulVecfl(ob->obmat,ipoint); + Mat4MulVecfl(ob->obmat,def_loc);/* def_loc remains as intersection point for next iteration */ + } + + /* store for reactors */ + VECCOPY(cstate.co,ipoint); + VecLerpf(cstate.vel,pa->state.vel,state->vel,min_d); + QuatInterpol(cstate.rot,pa->state.rot,state->rot,min_d); + + /* slightly unphysical but looks nice enough */ + if(part->flag & PART_ROT_DYN){ + if(global==0){ + Mat4Mul3Vecfl(ob->obmat,def_nor); + Mat4Mul3Vecfl(ob->obmat,def_tan); + } + + Normalize(def_tan); + Normalize(def_nor); + VECCOPY(unit_nor,def_nor); + + /* create normal velocity */ + VecMulf(def_nor,Inpf(pa->state.vel,def_nor)); + + /* create tangential velocity */ + VecMulf(def_tan,Inpf(pa->state.vel,def_tan)); + + /* angular velocity change due to tangential velocity */ + Crossf(dave,unit_nor,def_tan); + VecMulf(dave,1.0f/pa->size); + + /* linear velocity change due to angular velocity */ + VecMulf(unit_nor,pa->size); /* point of impact from particle center */ + Crossf(dvel,pa->state.ave,unit_nor); + + if(through) + VecMulf(def_nor,-1.0); + + VecMulf(def_nor,1.0f-damp); + VECSUB(dvel,dvel,def_nor); + + VecMulf(dvel,1.0f-frict); + VecMulf(dave,1.0f-frict); + } + + if(d_len<0.001 && VecLength(pa->state.vel)<0.001){ + /* kill speed to stop slipping */ + VECCOPY(state->vel,zerovec); + VECCOPY(state->co,def_loc); + if(part->flag & PART_ROT_DYN) + VECCOPY(state->ave,zerovec); + deflections=10; + } + else{ + + /* apply new coordinates */ + VECADD(state->co,def_loc,dvec); + + Normalize(dvec); + + /* we have to use original velocity because otherwise we get slipping */ + /* when forces like gravity balance out damping & friction */ + VecMulf(dvec,VecLength(pa->state.vel)*(d_len/o_len)); + VECCOPY(state->vel,dvec); + + if(part->flag & PART_ROT_DYN){ + VECADD(state->vel,state->vel,dvel); + VecMulf(state->vel,0.5); + VECADD(state->ave,state->ave,dave); + VecMulf(state->ave,0.5); + } + } + } + deflections++; + + cstate.time=cfra-(1.0f-min_d)*dfra; + //particle_react_to_collision(min_ob,pob,psys,pa,p,&cstate); + push_reaction(pob,psys,p,PART_EVENT_COLLIDE,&cstate); + } + else + return; + } +} +/************************************************/ +/* Boid physics */ +/************************************************/ +static int boid_see_mesh(ListBase *lb, Object *pob, ParticleSystem *psys, float *vec1, float *vec2, float *loc, float *nor, float cfra) +{ + Object *ob, *min_ob; + DerivedMesh *dm; + MFace *mface; + MVert *mvert; + ParticleEffectorCache *ec; + ParticleSystemModifierData *psmd=psys_get_modifier(pob,psys); + float imat[4][4]; + float co1[3], co2[3], min_w[4], min_d; + int min_face=0, intersect=0; + + if(lb->first){ + intersect=0; + min_d=20000.0; + min_ob=NULL; + for(ec=lb->first; ec; ec=ec->next){ + if(ec->type & PSYS_EC_DEFLECT){ + ob= ec->ob; + + if(psys->part->type!=PART_HAIR) + where_is_object_time(ob,cfra); + + if(ob==pob) + dm=psmd->dm; + else + dm=0; + + VECCOPY(co1,vec1); + VECCOPY(co2,vec2); + + if(ec->vert_cos==0){ + /* convert particle coordinates to object coordinates */ + Mat4Invert(imat,ob->obmat); + + Mat4MulVecfl(imat,co1); + Mat4MulVecfl(imat,co2); + } + + if(psys_intersect_dm(ob,dm,ec->vert_cos,co1,co2,&min_d,&min_face,min_w,ec->face_minmax,0,0,0)) + min_ob=ob; + } + } + if(min_ob){ + ob=min_ob; + + if(ob==pob){ + dm=psmd->dm; + } + else{ + psys_disable_all(ob); + + dm=mesh_get_derived_deform(ob,0); + + psys_enable_all(ob); + } + + mface=dm->getFaceDataArray(dm,CD_MFACE); + mface+=min_face; + mvert=dm->getVertDataArray(dm,CD_MVERT); + + /* get deflection point & normal */ + psys_interpolate_face(mvert,mface,0,min_w,loc,nor,0,0); + + VECADD(nor,nor,loc); + Mat4MulVecfl(ob->obmat,loc); + Mat4MulVecfl(ob->obmat,nor); + VECSUB(nor,nor,loc); + return 1; + } + } + return 0; +} +/* vector calculus functions in 2d vs. 3d */ +static void set_boid_vec_func(BoidVecFunc *bvf, int is_2d) +{ + if(is_2d){ + bvf->Addf = Vec2Addf; + bvf->Subf = Vec2Subf; + bvf->Mulf = Vec2Mulf; + bvf->Length = Vec2Length; + bvf->Normalize = Normalize2; + bvf->Inpf = Inp2f; + bvf->Copyf = Vec2Copyf; + } + else{ + bvf->Addf = VecAddf; + bvf->Subf = VecSubf; + bvf->Mulf = VecMulf; + bvf->Length = VecLength; + bvf->Normalize = Normalize; + bvf->Inpf = Inpf; + bvf->Copyf = VecCopyf; + } +} +/* boids have limited processing capability so once there's too much information (acceleration) no more is processed */ +static int add_boid_acc(BoidVecFunc *bvf, float lat_max, float tan_max, float *lat_accu, float *tan_accu, float *acc, float *dvec, float *vel) +{ + static float tangent[3]; + static float tan_length; + + if(vel){ + bvf->Copyf(tangent,vel); + tan_length=bvf->Normalize(tangent); + return 1; + } + else{ + float cur_tan, cur_lat; + float tan_acc[3], lat_acc[3]; + int ret=0; + + bvf->Copyf(tan_acc,tangent); + + if(tan_length>0.0){ + bvf->Mulf(tan_acc,Inpf(tangent,dvec)); + + bvf->Subf(lat_acc,dvec,tan_acc); + } + else{ + bvf->Copyf(tan_acc,dvec); + lat_acc[0]=lat_acc[1]=lat_acc[2]=0.0f; + *lat_accu=lat_max; + } + + cur_tan=bvf->Length(tan_acc); + cur_lat=bvf->Length(lat_acc); + + /* add tangential acceleration */ + if(*lat_accu+cur_lat<=lat_max){ + bvf->Addf(acc,acc,lat_acc); + *lat_accu+=cur_lat; + ret=1; + } + else{ + bvf->Mulf(lat_acc,(lat_max-*lat_accu)/cur_lat); + bvf->Addf(acc,acc,lat_acc); + *lat_accu=lat_max; + } + + /* add lateral acceleration */ + if(*tan_accu+cur_tan<=tan_max){ + bvf->Addf(acc,acc,tan_acc); + *tan_accu+=cur_tan; + ret=1; + } + else{ + bvf->Mulf(tan_acc,(tan_max-*tan_accu)/cur_tan); + bvf->Addf(acc,acc,tan_acc); + *tan_accu=tan_max; + } + + return ret; + } +} +/* determines the acceleration that the boid tries to acchieve */ +static void boid_brain(BoidVecFunc *bvf, ParticleData *pa, Object *ob, ParticleSystem *psys, ParticleSettings *part, KDTree *tree, float timestep, float cfra, float *acc, int *pa_die) +{ + ParticleData *pars=psys->particles; + KDTreeNearest ptn[MAX_BOIDNEIGHBOURS+1]; + ParticleEffectorCache *ec=0; + float dvec[3]={0.0,0.0,0.0}, ob_co[3], ob_nor[3]; + float avoid[3]={0.0,0.0,0.0}, velocity[3]={0.0,0.0,0.0}, center[3]={0.0,0.0,0.0}; + float cubedist[MAX_BOIDNEIGHBOURS+1]; + int i, n, neighbours=0, near, not_finished=1; + + float cur_vel; + float lat_accu=0.0f, max_lat_acc=part->max_vel*part->max_lat_acc; + float tan_accu=0.0f, max_tan_acc=part->max_vel*part->max_tan_acc; + float avg_vel=part->average_vel*part->max_vel; + + acc[0]=acc[1]=acc[2]=0.0f; + /* the +1 neighbour is because boid itself is in the tree */ + neighbours=BLI_kdtree_find_n_nearest(tree,part->boidneighbours+1,pa->state.co,NULL,ptn); + + for(n=1; n<neighbours; n++){ + cubedist[n]=(float)pow((double)(ptn[n].dist/pa->size),3.0); + cubedist[n]=1.0f/MAX2(cubedist[n],1.0f); + } + + /* initialize tangent */ + add_boid_acc(bvf,0.0,0.0,0,0,0,0,pa->state.vel); + + for(i=0; i<BOID_TOT_RULES && not_finished; i++){ + switch(part->boidrule[i]){ + case BOID_COLLIDE: + /* collision avoidance */ + bvf->Copyf(dvec,pa->state.vel); + bvf->Mulf(dvec,5.0f); + bvf->Addf(dvec,dvec,pa->state.co); + if(boid_see_mesh(&psys->effectors,ob,psys,pa->state.co,dvec,ob_co,ob_nor,cfra)){ + float probelen = bvf->Length(dvec); + float proj; + float oblen; + + Normalize(ob_nor); + proj = bvf->Inpf(ob_nor,pa->state.vel); + + bvf->Subf(dvec,pa->state.co,ob_co); + oblen=bvf->Length(dvec); + + bvf->Copyf(dvec,ob_nor); + bvf->Mulf(dvec,-proj); + bvf->Mulf(dvec,((probelen/oblen)-1.0f)*100.0f*part->boidfac[BOID_COLLIDE]); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + break; + case BOID_AVOID: + /* predator avoidance */ + if(psys->effectors.first){ + for(ec=psys->effectors.first; ec; ec=ec->next){ + if(ec->type & PSYS_EC_EFFECTOR){ + Object *eob = ec->ob; + PartDeflect *pd = eob->pd; + + if(pd->forcefield==PFIELD_FORCE && pd->f_strength<0.0){ + float distance; + VECSUB(dvec,eob->obmat[3],pa->state.co); + + distance=Normalize(dvec); + + if(part->flag & PART_DIE_ON_COL && distance < pd->mindist){ + *pa_die=1; + pa->dietime=cfra; + i=BOID_TOT_RULES; + break; + } + + if(pd->flag&PFIELD_USEMAX && distance > pd->maxdist) + ; + else{ + bvf->Mulf(dvec,part->boidfac[BOID_AVOID]*pd->f_strength/(float)pow((double)distance,(double)pd->f_power)); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + } + } + else if(ec->type & PSYS_EC_PARTICLE){ + Object *eob = ec->ob; + ParticleSystem *epsys; + ParticleSettings *epart; + ParticleKey state; + PartDeflect *pd; + KDTreeNearest ptn2[MAX_BOIDNEIGHBOURS]; + int totepart, p, count; + float distance; + epsys= BLI_findlink(&eob->particlesystem,ec->psys_nbr); + epart= epsys->part; + pd= epart->pd; + totepart= epsys->totpart; + + if(pd->forcefield==PFIELD_FORCE && pd->f_strength<0.0){ + count=BLI_kdtree_find_n_nearest(ec->tree,epart->boidneighbours,pa->state.co,NULL,ptn2); + for(p=0; p<count; p++){ + state.time=-1.0; + if(psys_get_particle_state(eob,epsys,ptn2[p].index,&state,0)){ + VECSUB(dvec, state.co, pa->state.co); + + distance = Normalize(dvec); + + if(part->flag & PART_DIE_ON_COL && distance < (epsys->particles+ptn2[p].index)->size){ + *pa_die=1; + pa->dietime=cfra; + i=BOID_TOT_RULES; + break; + } + + if(pd->flag&PFIELD_USEMAX && distance > pd->maxdist) + ; + else{ + bvf->Mulf(dvec,part->boidfac[BOID_AVOID]*pd->f_strength/(float)pow((double)distance,(double)pd->f_power)); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + } + } + } + } + } + } + break; + case BOID_CROWD: + /* crowd avoidance */ + near=0; + for(n=1; n<neighbours; n++){ + if(ptn[n].dist<2.0f*pa->size){ + bvf->Subf(dvec,pa->state.co,pars[ptn[n].index].state.co); + bvf->Mulf(dvec,(2.0f*pa->size-ptn[n].dist)/ptn[n].dist); + bvf->Addf(avoid,avoid,dvec); + near++; + } + /* ptn[] is distance ordered so no need to check others */ + else break; + } + if(near){ + bvf->Mulf(avoid,part->boidfac[BOID_CROWD]*2.0f/timestep); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,avoid,0); + } + break; + case BOID_CENTER: + /* flock centering */ + if(neighbours>1){ + for(n=1; n<neighbours; n++){ + bvf->Addf(center,center,pars[ptn[n].index].state.co); + } + bvf->Mulf(center,1.0f/((float)neighbours-1.0f)); + + bvf->Subf(dvec,center,pa->state.co); + + bvf->Mulf(dvec,part->boidfac[BOID_CENTER]*2.0f); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + break; + case BOID_AV_VEL: + /* average velocity */ + cur_vel=bvf->Length(pa->state.vel); + if(cur_vel>0.0){ + bvf->Copyf(dvec,pa->state.vel); + bvf->Mulf(dvec,part->boidfac[BOID_AV_VEL]*(avg_vel-cur_vel)/cur_vel); + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + break; + case BOID_VEL_MATCH: + /* velocity matching */ + if(neighbours>1){ + for(n=1; n<neighbours; n++){ + bvf->Copyf(dvec,pars[ptn[n].index].state.vel); + bvf->Mulf(dvec,cubedist[n]); + bvf->Addf(velocity,velocity,dvec); + } + bvf->Mulf(velocity,1.0f/((float)neighbours-1.0f)); + + bvf->Subf(dvec,velocity,pa->state.vel); + + bvf->Mulf(dvec,part->boidfac[BOID_VEL_MATCH]); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + break; + case BOID_GOAL: + /* goal seeking */ + if(psys->effectors.first){ + for(ec=psys->effectors.first; ec; ec=ec->next){ + if(ec->type & PSYS_EC_EFFECTOR){ + Object *eob = ec->ob; + PartDeflect *pd = eob->pd; + float temp[4]; + + if(pd->forcefield==PFIELD_FORCE && pd->f_strength>0.0){ + float distance; + VECSUB(dvec,eob->obmat[3],pa->state.co); + + distance=Normalize(dvec); + + if(pd->flag&PFIELD_USEMAX && distance > pd->maxdist) + ; + else{ + VecMulf(dvec,pd->f_strength*part->boidfac[BOID_GOAL]/(float)pow((double)distance,(double)pd->f_power)); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + } + else if(pd->forcefield==PFIELD_GUIDE){ + float distance; + + where_on_path(eob, (cfra-pa->time)/pa->lifetime, temp, dvec); + + VECSUB(dvec,temp,pa->state.co); + + distance=Normalize(dvec); + + if(pd->flag&PFIELD_USEMAX && distance > pd->maxdist) + ; + else{ + VecMulf(dvec,pd->f_strength*part->boidfac[BOID_GOAL]/(float)pow((double)distance,(double)pd->f_power)); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + } + } + else if(ec->type & PSYS_EC_PARTICLE){ + Object *eob = ec->ob; + ParticleSystem *epsys; + ParticleSettings *epart; + ParticleKey state; + PartDeflect *pd; + KDTreeNearest ptn2[MAX_BOIDNEIGHBOURS]; + int totepart, p, count; + float distance; + epsys= BLI_findlink(&eob->particlesystem,ec->psys_nbr); + epart= epsys->part; + pd= epart->pd; + totepart= epsys->totpart; + + if(pd->forcefield==PFIELD_FORCE && pd->f_strength>0.0){ + count=BLI_kdtree_find_n_nearest(ec->tree,epart->boidneighbours,pa->state.co,NULL,ptn2); + for(p=0; p<count; p++){ + state.time=-1.0; + if(psys_get_particle_state(eob,epsys,ptn2[p].index,&state,0)){ + VECSUB(dvec, state.co, pa->state.co); + + distance = Normalize(dvec); + + if(pd->flag&PFIELD_USEMAX && distance > pd->maxdist) + ; + else{ + bvf->Mulf(dvec,part->boidfac[BOID_AVOID]*pd->f_strength/(float)pow((double)distance,(double)pd->f_power)); + + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + } + } + } + } + } + } + break; + case BOID_LEVEL: + /* level flight */ + if((part->flag & PART_BOIDS_2D)==0){ + dvec[0]=dvec[1]=0.0; + dvec[2]=-pa->state.vel[2]; + + VecMulf(dvec,part->boidfac[BOID_LEVEL]); + not_finished=add_boid_acc(bvf,max_lat_acc,max_tan_acc,&lat_accu,&tan_accu,acc,dvec,0); + } + break; + } + } +} +/* tries to realize the wanted acceleration */ +static void boid_body(BoidVecFunc *bvf, ParticleData *pa, ParticleSystem *psys, ParticleSettings *part, float timestep, float *acc, ParticleKey *state) +{ + float dvec[3], bvec[3], length, max_vel=part->max_vel; + float *q2, q[4]; + float g=9.81f, pa_mass=part->mass; + float yvec[3]={0.0,1.0,0.0}, zvec[3]={0.0,0.0,-1.0}, bank; + + /* apply new velocity, location & rotation */ + copy_particle_key(state,&pa->state,0); + + if(part->flag & PART_SIZEMASS) + pa_mass*=pa->size; + + /* by regarding the acceleration as a force at this stage we*/ + /* can get better controll allthough it's a bit unphysical */ + bvf->Mulf(acc,1.0f/pa_mass); + + bvf->Copyf(dvec,acc); + bvf->Mulf(dvec,timestep*timestep*0.5f); + + bvf->Copyf(bvec,state->vel); + bvf->Mulf(bvec,timestep); + bvf->Addf(dvec,dvec,bvec); + bvf->Addf(state->co,state->co,dvec); + + /* air speed from wind effectors */ + if(psys->effectors.first){ + ParticleEffectorCache *ec; + for(ec=psys->effectors.first; ec; ec=ec->next){ + if(ec->type & PSYS_EC_EFFECTOR){ + Object *eob = ec->ob; + PartDeflect *pd = eob->pd; + + if(pd->forcefield==PFIELD_WIND && pd->f_strength!=0.0){ + float distance, wind[3]; + VecCopyf(wind,eob->obmat[2]); + distance=VecLenf(state->co,eob->obmat[3]); + + if (distance < 0.001) distance = 0.001f; + + if(pd->flag&PFIELD_USEMAX && distance > pd->maxdist) + ; + else{ + Normalize(wind); + VecMulf(wind,pd->f_strength/(float)pow((double)distance,(double)pd->f_power)); + bvf->Addf(state->co,state->co,wind); + } + } + } + } + } + + + if((part->flag & PART_BOIDS_2D)==0 && pa->state.vel[0]!=0.0 && pa->state.vel[0]!=0.0 && pa->state.vel[0]!=0.0){ + Crossf(yvec,state->vel,zvec); + + Normalize(yvec); + + bank=Inpf(yvec,acc); + + bank=-(float)atan((double)(bank/g)); + + bank*=part->banking; + + bank-=pa->bank; + if(bank>M_PI*part->max_bank){ + bank=pa->bank+(float)M_PI*part->max_bank; + } + else if(bank<-M_PI*part->max_bank){ + bank=pa->bank-(float)M_PI*part->max_bank; + } + else + bank+=pa->bank; + + pa->bank=bank; + } + else{ + bank=0.0; + } + + + VecRotToQuat(state->vel,bank,q); + + VECCOPY(dvec,state->vel); + VecMulf(dvec,-1.0f); + q2= vectoquat(dvec, OB_POSX, OB_POSZ); + + QuatMul(state->rot,q,q2); + + bvf->Mulf(acc,timestep); + bvf->Addf(state->vel,state->vel,acc); + + if(part->flag & PART_BOIDS_2D){ + state->vel[2]=0.0; + state->co[2]=part->groundz; + + if(psys->keyed_ob){ + Object *zob=psys->keyed_ob; + int min_face; + float co1[3],co2[3],min_d=2.0,min_w[4],imat[4][4]; + VECCOPY(co1,state->co); + VECCOPY(co2,state->co); + + co1[2]=1000.0f; + co2[2]=-1000.0f; + + Mat4Invert(imat,zob->obmat); + Mat4MulVecfl(imat,co1); + Mat4MulVecfl(imat,co2); + + if(psys_intersect_dm(zob,0,0,co1,co2,&min_d,&min_face,min_w,0,0,0,0)){ + DerivedMesh *dm; + MFace *mface; + MVert *mvert; + float loc[3],nor[3],q1[4]; + + psys_disable_all(zob); + dm=mesh_get_derived_final(zob,0); + psys_enable_all(zob); + + mface=dm->getFaceDataArray(dm,CD_MFACE); + mface+=min_face; + mvert=dm->getVertDataArray(dm,CD_MVERT); + + /* get deflection point & normal */ + psys_interpolate_face(mvert,mface,0,min_w,loc,nor,0,0); + + Mat4MulVecfl(zob->obmat,loc); + Mat4Mul3Vecfl(zob->obmat,nor); + + Normalize(nor); + + VECCOPY(state->co,loc); + + zvec[2]=1.0; + + Crossf(loc,zvec,nor); + + bank=VecLength(loc); + if(bank>0.0){ + bank=saasin(bank); + + VecRotToQuat(loc,bank,q); + + QUATCOPY(q1,state->rot); + + QuatMul(state->rot,q,q1); + } + } + } + } + + length=bvf->Length(state->vel); + if(length > max_vel) + bvf->Mulf(state->vel,max_vel/length); +} +/************************************************/ +/* Hair */ +/************************************************/ +void save_hair(Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd, float cfra){ + ParticleData *pa; + HairKey *key; + int totpart; + int i; + + Mat4Invert(ob->imat,ob->obmat); + + psys->lattice=psys_get_lattice(ob,psys); + + if(psys->totpart==0) return; + + totpart=psys->totpart; + + /* save new keys for elements if needed */ + for(i=0,pa=psys->particles; i<totpart; i++,pa++) { + /* first time alloc */ + if(pa->totkey==0 || pa->hair==NULL) { + pa->hair = MEM_callocN((psys->part->hair_step + 1) * sizeof(HairKey), "HairKeys"); + pa->totkey = 0; + } + + key = pa->hair + pa->totkey; + + /* convert from global to geometry space */ + VecCopyf(key->co, pa->state.co); + Mat4MulVecfl(ob->imat, key->co); + + if(pa->totkey) { + VECSUB(key->co, key->co, pa->hair->co); + psys_vec_rot_to_face(psmd->dm, pa, key->co); + } + + key->time = pa->state.time; + + key->weight = 1.0f - key->time / 100.0f; + + pa->totkey++; + + /* root is always in the origin of hair space so we set it to be so after the last key is saved*/ + if(pa->totkey == psys->part->hair_step + 1) + pa->hair->co[0] = pa->hair->co[1] = pa->hair->co[2] = 0.0f; + } +} +/************************************************/ +/* System Core */ +/************************************************/ +/* unbaked particles are calculated dynamically */ +static void dynamics_step(Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd, float cfra, + float *vg_vel, float *vg_tan, float *vg_rot, float *vg_size) +{ + ParticleData *pa; + ParticleKey *outstate, *key; + ParticleSettings *part=psys->part; + KDTree *tree=0; + BoidVecFunc bvf; + IpoCurve *icu_esize=find_ipocurve(part->ipo,PART_EMIT_SIZE); + Material *ma=give_current_material(ob,part->omat); + float timestep; + int p, totpart, pa_die; + /* current time */ + float ctime, ipotime; + /* frame & time changes */ + float dfra, dtime, pa_dtime, pa_dfra=0.0; + float birthtime, dietime; + + /* where have we gone in time since last time */ + dfra= cfra - psys->cfra; + + totpart=psys->totpart; + + timestep=psys_get_timestep(part); + dtime= dfra*timestep; + ctime= cfra*timestep; + ipotime= cfra; + + if(part->flag&PART_ABS_TIME && part->ipo){ + calc_ipo(part->ipo, cfra); + execute_ipo((ID *)part, part->ipo); + } + + if(dfra<0.0){ + float *vg_size=0; + if(part->type==PART_REACTOR) + vg_size=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_SIZE); + + for(p=0, pa=psys->particles; p<totpart; p++,pa++){ + if(pa->flag & (PARS_NO_DISP+PARS_UNEXIST)) continue; + + /* set correct ipo timing */ + if((part->flag&PART_ABS_TIME)==0 && part->ipo){ + ipotime=100.0f*(cfra-pa->time)/pa->lifetime; + calc_ipo(part->ipo, ipotime); + execute_ipo((ID *)part, part->ipo); + } + pa->size=psys_get_size(ob,ma,psmd,icu_esize,psys,part,pa,vg_size); + + if(part->type==PART_REACTOR) + initialize_particle(pa,p,ob,psys,psmd); + + reset_particle(pa,psys,psmd,ob,dtime,cfra,vg_vel,vg_tan,vg_rot); + + if(cfra>pa->time && part->flag & PART_LOOP && (part->flag & PART_LOOP_INSTANT)==0){ + pa->loop=(short)((cfra-pa->time)/pa->lifetime)+1; + pa->alive=PARS_UNBORN; + } + else{ + pa->loop=0; + if(cfra<=pa->time) + pa->alive=PARS_UNBORN; + /* without dynamics the state is allways known so no need to kill */ + else if(ELEM(part->phystype,PART_PHYS_NO,PART_PHYS_KEYED)==0) + pa->alive=PARS_KILLED; + } + } + + if(vg_size) + MEM_freeN(vg_size); + + //if(part->phystype==PART_PHYS_SOLID) + // reset_to_first_fragment(psys); + } + else{ + BLI_srandom(31415926 + (int)cfra + psys->seed); + + /* outstate is used so that particles are updated in parallel */ + outstate=MEM_callocN(totpart*sizeof(ParticleKey),"Particle Outstates"); + + /* update effectors */ + if(psys->effectors.first) + psys_end_effectors(psys); + + psys_init_effectors(ob,part->eff_group,psys); + + if(psys->effectors.first) + precalc_effectors(ob,psys,psmd); + + if(part->phystype==PART_PHYS_BOIDS){ + /* create particle tree for fast inter-particle comparisons */ + KDTree *tree=BLI_kdtree_new(totpart); + for(p=0, pa=psys->particles; p<totpart; p++,pa++){ + if(pa->flag & (PARS_NO_DISP+PARS_UNEXIST) || pa->alive!=PARS_ALIVE) + continue; + + BLI_kdtree_insert(tree, p, pa->state.co, NULL); + } + BLI_kdtree_balance(tree); + set_boid_vec_func(&bvf,part->flag&PART_BOIDS_2D); + } + + /* main loop: calculate physics for all particles */ + for(p=0, pa=psys->particles, key=outstate; p<totpart; p++,pa++,key++){ + if(pa->flag & (PARS_NO_DISP|PARS_UNEXIST)) continue; + + copy_particle_key(key,&pa->state,1); + + /* set correct ipo timing */ + if((part->flag&PART_ABS_TIME)==0 && part->ipo){ + ipotime=100.0f*(cfra-pa->time)/pa->lifetime; + calc_ipo(part->ipo, ipotime); + execute_ipo((ID *)part, part->ipo); + } + pa->size=psys_get_size(ob,ma,psmd,icu_esize,psys,part,pa,vg_size); + + pa_die=0; + + if(pa->alive==PARS_UNBORN || pa->alive==PARS_KILLED || ELEM(part->phystype,PART_PHYS_NO,PART_PHYS_KEYED)){ + /* allways reset particles to emitter before birth */ + reset_particle(pa,psys,psmd,ob,dtime,cfra,vg_vel,vg_tan,vg_rot); + copy_particle_key(key,&pa->state,1); + } + + if(dfra>0.0 || psys->recalc){ + + if(psys->reactevents.first && ELEM(pa->alive,PARS_DEAD,PARS_KILLED)==0) + react_to_events(psys,p); + + pa_dfra= dfra; + pa_dtime= dtime; + + if(pa->flag & PART_LOOP && pa->flag & PART_LOOP_INSTANT) + birthtime=pa->dietime; + else + birthtime=pa->time+pa->loop*pa->lifetime; + + dietime=birthtime+pa->lifetime; + + if(birthtime < cfra && birthtime >= psys->cfra){ + /* particle is born some time between this and last step*/ + pa->alive=PARS_ALIVE; + pa_dfra= cfra - birthtime; + pa_dtime= pa_dfra*timestep; + } + else if(dietime <= cfra && psys->cfra < dietime){ + /* particle dies some time between this and last step */ + pa_dfra= dietime - psys->cfra; + pa_dtime= pa_dfra*timestep; + pa_die=1; + } + else if(dietime < cfra){ + /* TODO: figure out if there's something to be done when particle is dead */ + } + + copy_particle_key(key,&pa->state,1); + + if(dfra>0.0 && pa->alive==PARS_ALIVE){ + switch(part->phystype){ + case PART_PHYS_NEWTON: + /* do global forces & effectors */ + apply_particle_forces(p,pa,ob,psys,part,timestep,pa_dfra,cfra,key); + + /* deflection */ + deflect_particle(ob,psmd,psys,part,pa,p,pa_dfra,cfra,key,&pa_die); + + /* rotations */ + rotate_particle(part,pa,pa_dfra,timestep,key); + + break; + case PART_PHYS_BOIDS: + { + float acc[3]; + boid_brain(&bvf,pa,ob,psys,part,tree,timestep,cfra,acc,&pa_die); + if(pa_die==0) + boid_body(&bvf,pa,psys,part,timestep,acc,key); + break; + } + } + + push_reaction(ob,psys,p,PART_EVENT_NEAR,key); + + if(pa_die){ + push_reaction(ob,psys,p,PART_EVENT_DEATH,key); + + if(part->flag & PART_LOOP){ + pa->loop++; + + if(part->flag & PART_LOOP_INSTANT){ + reset_particle(pa,psys,psmd,ob,0.0,cfra,vg_vel,vg_tan,vg_rot); + pa->alive=PARS_ALIVE; + copy_particle_key(key,&pa->state,1); + } + else + pa->alive=PARS_UNBORN; + } + else{ + pa->alive=PARS_DEAD; + key->time=pa->dietime; + + if(pa->flag&PARS_STICKY) + psys_key_to_object(pa->stick_ob,key,0); + } + } + else + key->time=cfra; + } + } + } + /* apply outstates to particles */ + for(p=0, pa=psys->particles, key=outstate; p<totpart; p++,pa++,key++) + copy_particle_key(&pa->state,key,1); + + MEM_freeN(outstate); + } + if(psys->reactevents.first) + BLI_freelistN(&psys->reactevents); + + if(tree) + BLI_kdtree_free(tree); +} + +/* check if path cache or children need updating and do it if needed */ +static void psys_update_path_cache(Object *ob, ParticleSystemModifierData *psmd, ParticleSystem *psys, float cfra) +{ + ParticleSettings *part=psys->part; + ParticleEditSettings *pset=&G.scene->toolsettings->particle; + int distr=0,alloc=0; + + if((psys->part->childtype && psys->totchild != psys->totpart*part->child_nbr) || psys->recalc&PSYS_ALLOC) + alloc=1; + + if(alloc || psys->recalc&PSYS_DISTR || (psys->vgroup[PSYS_VG_DENSITY] && (G.f & G_WEIGHTPAINT))) + distr=1; + + if(distr){ + if(alloc) + alloc_particles(psys,psys->totpart); + + if(psys->totchild && part->childtype){ + distribute_particles(ob,psys,PART_FROM_CHILD); + + if(part->from!=PART_FROM_PARTICLE && part->childtype==PART_CHILD_FACES && part->parents!=0.0) + psys_find_parents(ob,psmd,psys); + } + } + + if((part->type==PART_HAIR || psys->flag&PSYS_KEYED) && (psys_in_edit_mode(psys) + || part->draw_as==PART_DRAW_PATH || part->draw&PART_DRAW_KEYS)){ + psys_cache_paths(ob, psys, cfra, 0); + + if(part->childtype){ + if((G.rendering || (part->flag&PART_CHILD_RENDER)==0) + || (psys_in_edit_mode(psys) && (pset->flag&PE_SHOW_CHILD))) + psys_cache_child_paths(ob, psys, cfra, 0); + } + } + else if(psys->pathcache) + psys_free_path_cache(psys); +} + +static void hair_step(Object *ob, ParticleSystemModifierData *psmd, ParticleSystem *psys, float cfra) +{ + ParticleSettings *part = psys->part; + + if(psys->recalc & PSYS_DISTR){ + /* need this for changing subsurf levels */ + psys_calc_dmfaces(ob, psmd->dm, psys); + } + + if(psys->effectors.first) + psys_end_effectors(psys); + + psys_init_effectors(ob,part->eff_group,psys); + if(psys->effectors.first) + precalc_effectors(ob,psys,psmd); + + if(psys_in_edit_mode(psys)) + PE_recalc_world_cos(ob, psys); + + psys_update_path_cache(ob,psmd,psys,cfra); +} + +/* updates cached particles' alive & other flags etc..*/ +static void cached_step(Object *ob, ParticleSystemModifierData *psmd, ParticleSystem *psys, float cfra, float *vg_size) +{ + ParticleSettings *part=psys->part; + ParticleData *pa; + ParticleKey state; + IpoCurve *icu_esize=find_ipocurve(part->ipo,PART_EMIT_SIZE); + Material *ma=give_current_material(ob,part->omat); + int p; + float ipotime=cfra, disp; + + /* deprecated */ + //if(psys->recalc&PSYS_DISTR){ + // /* The dm could have been changed so particle emitter element */ + // /* indices might be wrong. There's really no "nice" way to handle*/ + // /* this so we just try not to crash by correcting indices. */ + // int totnum=-1; + // switch(part->from){ + // case PART_FROM_VERT: + // totnum=psmd->dm->getNumVerts(psmd->dm); + // break; + // case PART_FROM_FACE: + // case PART_FROM_VOLUME: + // totnum=psmd->dm->getNumFaces(psmd->dm); + // break; + // } + + // if(totnum==0){ + // /* Now we're in real trouble, there's no emitter elements!! */ + // for(p=0, pa=psys->particles; p<psys->totpart; p++,pa++) + // pa->num=-1; + // } + // else if(totnum>0){ + // for(p=0, pa=psys->particles; p<psys->totpart; p++,pa++) + // pa->num=pa->num%totnum; + // } + //} + + if(psys->effectors.first) + psys_end_effectors(psys); + + //if(part->flag & (PART_BAKED_GUIDES+PART_BAKED_DEATHS)){ + psys_init_effectors(ob,part->eff_group,psys); + if(psys->effectors.first) + precalc_effectors(ob,psys,psmd); + //} + + disp= (float)get_current_display_percentage(psys)/50.0f-1.0f; + + for(p=0, pa=psys->particles; p<psys->totpart; p++,pa++){ + if((part->flag&PART_ABS_TIME)==0 && part->ipo){ + ipotime=100.0f*(cfra-pa->time)/pa->lifetime; + calc_ipo(part->ipo, ipotime); + execute_ipo((ID *)part, part->ipo); + } + pa->size= psys_get_size(ob,ma,psmd,icu_esize,psys,part,pa,vg_size); + + psys->lattice=psys_get_lattice(ob,psys); + + /* update alive status and push events */ + if(pa->time>cfra) + pa->alive=PARS_UNBORN; + else if(pa->dietime<=cfra){ + if(pa->dietime>psys->cfra){ + state.time=pa->dietime; + psys_get_particle_state(ob,psys,p,&state,1); + push_reaction(ob,psys,p,PART_EVENT_DEATH,&state); + } + pa->alive=PARS_DEAD; + } + else{ + pa->alive=PARS_ALIVE; + state.time=cfra; + psys_get_particle_state(ob,psys,p,&state,1); + state.time=cfra; + push_reaction(ob,psys,p,PART_EVENT_NEAR,&state); + } + + if(psys->lattice){ + end_latt_deform(); + psys->lattice=0; + } + + if(pa->r_rot[0] > disp) + pa->flag |= PARS_NO_DISP; + else + pa->flag &= ~PARS_NO_DISP; + } +} +/* Calculates the next state for all particles of the system */ +/* In particles code most fra-ending are frames, time-ending are fra*timestep (seconds)*/ +static void system_step(Object *ob, ParticleSystem *psys, ParticleSystemModifierData *psmd, float cfra) +{ + ParticleSettings *part; + ParticleData *pa; + int totpart,oldtotpart=0,p; + float disp, *vg_vel=0, *vg_tan=0, *vg_rot=0, *vg_size=0; + int init=0,distr=0,alloc=0; + + /*----start validity checks----*/ + + part=psys->part; + + if(part->flag&PART_ABS_TIME && part->ipo){ + calc_ipo(part->ipo, cfra); + execute_ipo((ID *)part, part->ipo); + } + + if(part->from!=PART_FROM_PARTICLE) + vg_size=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_SIZE); + + if(part->type == PART_HAIR) { + if(psys->flag & PSYS_HAIR_DONE) { + hair_step(ob, psmd, psys, cfra); + psys->cfra = cfra; + psys->recalc = 0; + return; + } + } + else { + if(psys->recalc) + clear_particles_from_cache(ob,psys,(int)cfra); + else if(get_particles_from_cache(ob, psys, (int)cfra)){ + cached_step(ob,psmd,psys,cfra,vg_size); + psys->cfra=cfra; + psys->recalc = 0; + return; + } + } + + /* if still here react to events */ + + if(psys->recalc&PSYS_TYPE) { + /* system type has changed so set sensible defaults and clear non applicable flags */ + if(part->from == PART_FROM_PARTICLE) { + if(part->type != PART_REACTOR) + part->from = PART_FROM_FACE; + if(part->distr == PART_DISTR_GRID) + part->distr = PART_DISTR_JIT; + } + + if(psys->part->phystype != PART_PHYS_KEYED) + psys->flag &= ~PSYS_KEYED; + + if(part->type == PART_HAIR) { + part->draw_as = PART_DRAW_PATH; + part->rotfrom = PART_ROT_IINCR; + } + else + free_hair(psys); + + psys->recalc &= ~PSYS_TYPE; + alloc = 1; + } + else + oldtotpart = psys->totpart; + + if(part->distr == PART_DISTR_GRID) + totpart = part->grid_res * part->grid_res * part->grid_res; + else + totpart = psys->part->totpart; + + if(oldtotpart != totpart || psys->recalc&PSYS_ALLOC || (psys->part->childtype && psys->totchild != psys->totpart*part->child_nbr)) + alloc = 1; + + if(alloc || psys->recalc&PSYS_DISTR || (psys->vgroup[PSYS_VG_DENSITY] && (G.f & G_WEIGHTPAINT) && ob==OBACT)) + distr = 1; + + if(distr || psys->recalc&PSYS_INIT) + init = 1; + + if(init) { + if(distr) { + if(alloc) + alloc_particles(psys, totpart); + + distribute_particles(ob, psys, part->from); + + if(psys->totchild && part->childtype) + distribute_particles(ob, psys, PART_FROM_CHILD); + } + initialize_all_particles(ob, psys, psmd); + + if(alloc) + reset_all_particles(ob, psys, psmd, 0.0, cfra, oldtotpart); + + /* flag for possible explode modifiers after this system */ + psmd->flag |= eParticleSystemFlag_Pars; + } + + + if(part->phystype==PART_PHYS_KEYED && psys->flag&PSYS_FIRST_KEYED) + psys_count_keyed_targets(ob,psys); + + if(part->from!=PART_FROM_PARTICLE){ + vg_vel=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_VEL); + vg_tan=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_TAN); + vg_rot=psys_cache_vgroup(psmd->dm,psys,PSYS_VG_ROT); + } + + /* set particles to be not calculated */ + disp= (float)get_current_display_percentage(psys)/50.0f-1.0f; + + if(disp<1.0f) for(p=0, pa=psys->particles; p<totpart; p++,pa++){ + if(pa->r_rot[0] > disp) + pa->flag |= PARS_NO_DISP; + else + pa->flag &= ~PARS_NO_DISP; + } + + /* ok now we're all set so let's go */ + if(psys->totpart) { + //if(psys->part->from==PART_FROM_FACE) { + // psys_calc_dmfaces(ob, psmd->dm, psys); + //} + dynamics_step(ob,psys,psmd,cfra,vg_vel,vg_tan,vg_rot,vg_size); + } + psys->recalc = 0; + psys->cfra=cfra; + + if(part->type!=PART_HAIR) + write_particles_to_cache(ob, psys, cfra); + + /* for keyed particles the path is allways known so it can be drawn */ + if(part->phystype==PART_PHYS_KEYED && psys->flag&PSYS_FIRST_KEYED){ + set_keyed_keys(ob, psys); + psys_update_path_cache(ob,psmd,psys,(int)cfra); + } + else if(psys->pathcache) + psys_free_path_cache(psys); + + if(vg_vel) + MEM_freeN(vg_vel); + + if(psys->lattice){ + end_latt_deform(); + psys->lattice=0; + } +} + +void psys_to_softbody(Object *ob, ParticleSystem *psys, int force_recalc) +{ + SoftBody *sb; + short softflag; + + if((psys->softflag&OB_SB_ENABLE)==0) return; + + if((ob->recalc&OB_RECALC_TIME)==0) + psys->softflag|=OB_SB_REDO; + + /* let's replace the object's own softbody with the particle softbody */ + /* a temporary solution before cloth simulation is implemented, jahka */ + + /* save these */ + sb=ob->soft; + softflag=ob->softflag; + + /* swich to new ones */ + ob->soft=psys->soft; + ob->softflag=psys->softflag; + + /* signal for before/free bake */ + //if(psys->flag & PSYS_SOFT_BAKE || force_recalc){ + // sbObjectToSoftbody(ob); + // psys->flag &= ~PSYS_SOFT_BAKE; + //} + + /* do softbody */ + sbObjectStep(ob, (float)G.scene->r.cfra, NULL, psys_count_keys(psys)); + + /* return things back to normal */ + psys->soft=ob->soft; + psys->softflag=ob->softflag; + + ob->soft=sb; + ob->softflag=softflag; +} +static int hair_needs_recalc(ParticleSystem *psys) +{ + if((psys->flag & PSYS_EDITED)==0 && ( + (psys->flag & PSYS_HAIR_DONE)==0 + || psys->recalc & PSYS_RECALC_HAIR) + ) { + psys->recalc &= ~PSYS_RECALC_HAIR; + return 1; + } + + return 0; +} +/* main particle update call, checks that things are ok on the large scale before actual particle calculations */ +void particle_system_update(Object *ob, ParticleSystem *psys){ + + ParticleSystemModifierData *psmd=0; + float cfra; + + if((psys->flag & PSYS_ENABLED)==0) return; + + psmd=psys_get_modifier(ob,psys); + + cfra=bsystem_time(ob,(float)CFRA,0.0); + + /* system was already updated from modifier stack */ + if(psmd->flag&eParticleSystemFlag_psys_updated){ + psmd->flag &= ~eParticleSystemFlag_psys_updated; + /* make sure it really was updated to cfra */ + if(psys->cfra==cfra) + return; + } + + /* baked path softbody */ + if(psys->part->type==PART_HAIR && psys->soft) + psys_to_softbody(ob, psys, 0); + + /* not needed, this is all handled in hair_step */ + ///* is the mesh changing under the edited particles? */ + //if((psys->flag & PSYS_EDITED) && psys->part->type==PART_HAIR && psys->recalc & PSYS_RECALC_HAIR) { + // /* Just update the particles on the mesh */ + // psys_update_edithair_dmfaces(ob, psmd->dm, psys); + //} + + if(psys->part->type==PART_HAIR && hair_needs_recalc(psys)){ + float hcfra=0.0f; + int i; + free_hair(psys); + + /* first step is negative so particles get killed and reset */ + psys->cfra=1.0f; + + for(i=0; i<=psys->part->hair_step; i++){ + hcfra=100.0f*(float)i/(float)psys->part->hair_step; + system_step(ob,psys,psmd,hcfra); + save_hair(ob,psys,psmd,hcfra); + } + + psys->flag |= PSYS_HAIR_DONE; + + if(psys->softflag&OB_SB_ENABLE) + psys_to_softbody(ob,psys,1); + } + + system_step(ob,psys,psmd,cfra); + + Mat4CpyMat4(psys->imat, ob->imat); /* used for duplicators */ +} + |