diff options
author | Janne Karhu <jhkarh@gmail.com> | 2011-02-13 16:50:19 +0300 |
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committer | Janne Karhu <jhkarh@gmail.com> | 2011-02-13 16:50:19 +0300 |
commit | 7b4c4183f38a423f8129af132ef676771fb79459 (patch) | |
tree | 9e9a2ff67debfa434b062004f76f8f81d2cf8052 /source/blender/blenkernel/intern/particle_system.c | |
parent | c68a59175e8284a3475886152ecb886c6fae0f39 (diff) |
Small addition to particle grid distribution:
* New option to distribute particles in a hexagonal grid.
* This is much more stable for fluids than normal grid distribution and looks quite nice otherwise too :)
* Also some small scale code cleanup of grid distribution code.
Diffstat (limited to 'source/blender/blenkernel/intern/particle_system.c')
-rw-r--r-- | source/blender/blenkernel/intern/particle_system.c | 68 |
1 files changed, 42 insertions, 26 deletions
diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c index e29293a3087..65bd4f110b4 100644 --- a/source/blender/blenkernel/intern/particle_system.c +++ b/source/blender/blenkernel/intern/particle_system.c @@ -411,8 +411,8 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) mv=mvert; /* find bounding box of dm */ - VECCOPY(min,mv->co); - VECCOPY(max,mv->co); + copy_v3_v3(min, mv->co); + copy_v3_v3(max, mv->co); mv++; for(i=1; i<totvert; i++, mv++){ @@ -428,13 +428,13 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) VECSUB(delta,max,min); /* determine major axis */ - axis = (delta[0]>=delta[1])?0:((delta[1]>=delta[2])?1:2); - + 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); + 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); @@ -452,11 +452,11 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) 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->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->hair_index=0; /* abused in volume calculation */ + pa->hair_index = 0; /* abused in volume calculation */ } } } @@ -467,9 +467,9 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) pa=psys->particles; - min[0]-=d/2.0f; - min[1]-=d/2.0f; - min[2]-=d/2.0f; + min[0] -= d/2.0f; + min[1] -= d/2.0f; + min[2] -= d/2.0f; for(i=0,mv=mvert; i<totvert; i++,mv++){ sub_v3_v3v3(vec,mv->co,min); @@ -501,20 +501,20 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) for(a2=0; a2<size[(a+2)%3]; a2++){ mface= mface_array; - pa=psys->particles + a1*a1mul + a2*a2mul; - VECCOPY(co1,pa->fuv); - co1[a]-= d < delta[a] ? d/2.f : delta[a]/2.f; - VECCOPY(co2,co1); - co2[a]+=delta[a] + 0.001f*d; - co1[a]-=0.001f*d; + pa = psys->particles + a1*a1mul + a2*a2mul; + copy_v3_v3(co1, pa->fuv); + co1[a] -= d < delta[a] ? d/2.f : delta[a]/2.f; + copy_v3_v3(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); + copy_v3_v3(v1, mvert[mface->v1].co); + copy_v3_v3(v2, mvert[mface->v2].co); + copy_v3_v3(v3, mvert[mface->v3].co); - if(isect_axial_line_tri_v3(a,co1, co2, v2, v3, v1, &lambda)){ + if(isect_axial_line_tri_v3(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 */ @@ -522,9 +522,9 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) } if(mface->v4){ - VECCOPY(v4,mvert[mface->v4].co); + copy_v3_v3(v4, mvert[mface->v4].co); - if(isect_axial_line_tri_v3(a,co1, co2, v4, v1, v3, &lambda)){ + if(isect_axial_line_tri_v3(a, co1, co2, v4, v1, v3, &lambda)){ if(from==PART_FROM_FACE) (pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST; else @@ -549,6 +549,22 @@ static void distribute_particles_in_grid(DerivedMesh *dm, ParticleSystem *psys) } } + if(psys->part->flag & PART_GRID_HEXAGONAL) { + 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++){ + if(j%2) + pa->fuv[0] += d/2.f; + + if(k%2) { + pa->fuv[0] += d/2.f; + pa->fuv[1] += d/2.f; + } + } + } + } + } + if(psys->part->flag & PART_GRID_INVERT){ for(i=0; i<size[0]; i++){ for(j=0; j<size[1]; j++){ |