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Diffstat (limited to 'source/blender/blenkernel/intern/particle_child.c')
| -rw-r--r-- | source/blender/blenkernel/intern/particle_child.c | 732 |
1 files changed, 732 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/particle_child.c b/source/blender/blenkernel/intern/particle_child.c new file mode 100644 index 00000000000..7b2e07ea96f --- /dev/null +++ b/source/blender/blenkernel/intern/particle_child.c @@ -0,0 +1,732 @@ +/* + * ***** BEGIN GPL 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. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * The Original Code is Copyright (C) Blender Foundation + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): Lukas Toenne + * + * ***** END GPL LICENSE BLOCK ***** + */ + +/** \file blender/blenkernel/intern/particle_child.c + * \ingroup bke + */ + +#include "BLI_math.h" +#include "BLI_noise.h" + +#include "DNA_material_types.h" + +#include "BKE_colortools.h" +#include "BKE_particle.h" + +struct Material; + +void do_kink(ParticleKey *state, const float par_co[3], const float par_vel[3], const float par_rot[4], float time, float freq, float shape, float amplitude, float flat, + short type, short axis, float obmat[4][4], int smooth_start); +float do_clump(ParticleKey *state, const float par_co[3], float time, const float orco_offset[3], float clumpfac, float clumppow, float pa_clump, + bool use_clump_noise, float clump_noise_size, CurveMapping *clumpcurve); +void do_child_modifiers(ParticleSimulationData *sim, + ParticleTexture *ptex, const float par_co[3], const float par_vel[3], const float par_rot[4], const float par_orco[3], + ChildParticle *cpa, const float orco[3], float mat[4][4], ParticleKey *state, float t); + +static void get_strand_normal(Material *ma, const float surfnor[3], float surfdist, float nor[3]) +{ + float cross[3], nstrand[3], vnor[3], blend; + + if (!((ma->mode & MA_STR_SURFDIFF) || (ma->strand_surfnor > 0.0f))) + return; + + if (ma->mode & MA_STR_SURFDIFF) { + cross_v3_v3v3(cross, surfnor, nor); + cross_v3_v3v3(nstrand, nor, cross); + + blend = dot_v3v3(nstrand, surfnor); + CLAMP(blend, 0.0f, 1.0f); + + interp_v3_v3v3(vnor, nstrand, surfnor, blend); + normalize_v3(vnor); + } + else { + copy_v3_v3(vnor, nor); + } + + if (ma->strand_surfnor > 0.0f) { + if (ma->strand_surfnor > surfdist) { + blend = (ma->strand_surfnor - surfdist) / ma->strand_surfnor; + interp_v3_v3v3(vnor, vnor, surfnor, blend); + normalize_v3(vnor); + } + } + + copy_v3_v3(nor, vnor); +} + +/* ------------------------------------------------------------------------- */ + +typedef struct ParticlePathIterator { + ParticleCacheKey *key; + int index; + float time; + + ParticleCacheKey *parent_key; + float parent_rotation[4]; +} ParticlePathIterator; + +static void psys_path_iter_get(ParticlePathIterator *iter, ParticleCacheKey *keys, int totkeys, + ParticleCacheKey *parent, int index) +{ + BLI_assert(index >= 0 && index < totkeys); + + iter->key = keys + index; + iter->index = index; + iter->time = (float)index / (float)(totkeys - 1); + + if (parent) { + iter->parent_key = parent + index; + if (index > 0) + mul_qt_qtqt(iter->parent_rotation, iter->parent_key->rot, parent->rot); + else + copy_qt_qt(iter->parent_rotation, parent->rot); + } + else { + iter->parent_key = NULL; + unit_qt(iter->parent_rotation); + } +} + +typedef struct ParticlePathModifier { + struct ParticlePathModifier *next, *prev; + + void (*apply)(ParticleCacheKey *keys, int totkeys, ParticleCacheKey *parent_keys); +} ParticlePathModifier; + +/* ------------------------------------------------------------------------- */ + +static void do_kink_spiral_deform(ParticleKey *state, const float dir[3], const float kink[3], + float time, float freq, float shape, float amplitude, + const float spiral_start[3]) +{ + float result[3]; + + CLAMP(time, 0.f, 1.f); + + copy_v3_v3(result, state->co); + + { + /* Creates a logarithmic spiral: + * r(theta) = a * exp(b * theta) + * + * The "density" parameter b is defined by the shape parameter + * and goes up to the Golden Spiral for 1.0 + * http://en.wikipedia.org/wiki/Golden_spiral + */ + const float b = shape * (1.0f + sqrtf(5.0f)) / (float)M_PI * 0.25f; + /* angle of the spiral against the curve (rotated opposite to make a smooth transition) */ + const float start_angle = ((b != 0.0f) ? atanf(1.0f / b) : + (float)-M_PI_2) + (b > 0.0f ? -(float)M_PI_2 : (float)M_PI_2); + + float spiral_axis[3], rot[3][3]; + float vec[3]; + + float theta = freq * time * 2.0f * (float)M_PI; + float radius = amplitude * expf(b * theta); + + /* a bit more intuitive than using negative frequency for this */ + if (amplitude < 0.0f) + theta = -theta; + + cross_v3_v3v3(spiral_axis, dir, kink); + normalize_v3(spiral_axis); + + mul_v3_v3fl(vec, kink, -radius); + + axis_angle_normalized_to_mat3(rot, spiral_axis, theta); + mul_m3_v3(rot, vec); + + madd_v3_v3fl(vec, kink, amplitude); + + axis_angle_normalized_to_mat3(rot, spiral_axis, -start_angle); + mul_m3_v3(rot, vec); + + add_v3_v3v3(result, spiral_start, vec); + } + + copy_v3_v3(state->co, result); +} + +static void do_kink_spiral(ParticleThreadContext *ctx, ParticleTexture *ptex, const float parent_orco[3], + ChildParticle *cpa, const float orco[3], float hairmat[4][4], + ParticleCacheKey *keys, ParticleCacheKey *parent_keys, int *r_totkeys, float *r_max_length) +{ + struct ParticleSettings *part = ctx->sim.psys->part; + const int seed = ctx->sim.psys->child_seed + (int)(cpa - ctx->sim.psys->child); + const int totkeys = ctx->segments + 1; + const int extrakeys = ctx->extra_segments; + + float kink_amp_random = part->kink_amp_random; + float kink_amp = part->kink_amp * (1.0f - kink_amp_random * psys_frand(ctx->sim.psys, 93541 + seed)); + float kink_freq = part->kink_freq; + float kink_shape = part->kink_shape; + float kink_axis_random = part->kink_axis_random; + float rough1 = part->rough1; + float rough2 = part->rough2; + float rough_end = part->rough_end; + + ParticlePathIterator iter; + ParticleCacheKey *key; + int k; + + float dir[3]; + float spiral_start[3] = {0.0f, 0.0f, 0.0f}; + float spiral_start_time = 0.0f; + float spiral_par_co[3] = {0.0f, 0.0f, 0.0f}; + float spiral_par_vel[3] = {0.0f, 0.0f, 0.0f}; + float spiral_par_rot[4] = {1.0f, 0.0f, 0.0f, 0.0f}; + float totlen; + float cut_time; + int start_index = 0, end_index = 0; + float kink_base[3]; + + if (ptex) { + kink_amp *= ptex->kink_amp; + kink_freq *= ptex->kink_freq; + rough1 *= ptex->rough1; + rough2 *= ptex->rough2; + rough_end *= ptex->roughe; + } + + cut_time = (totkeys - 1) * ptex->length; + zero_v3(spiral_start); + + for (k = 0, key = keys; k < totkeys-1; k++, key++) { + if ((float)(k + 1) >= cut_time) { + float fac = cut_time - (float)k; + ParticleCacheKey *par = parent_keys + k; + + start_index = k + 1; + end_index = start_index + extrakeys; + + spiral_start_time = ((float)k + fac) / (float)(totkeys - 1); + interp_v3_v3v3(spiral_start, key->co, (key+1)->co, fac); + + interp_v3_v3v3(spiral_par_co, par->co, (par+1)->co, fac); + interp_v3_v3v3(spiral_par_vel, par->vel, (par+1)->vel, fac); + interp_qt_qtqt(spiral_par_rot, par->rot, (par+1)->rot, fac); + + break; + } + } + + zero_v3(dir); + + zero_v3(kink_base); + kink_base[part->kink_axis] = 1.0f; + mul_mat3_m4_v3(ctx->sim.ob->obmat, kink_base); + + for (k = 0, key = keys; k < end_index; k++, key++) { + float par_time; + float *par_co, *par_vel, *par_rot; + + psys_path_iter_get(&iter, keys, end_index, NULL, k); + if (k < start_index) { + sub_v3_v3v3(dir, (key+1)->co, key->co); + normalize_v3(dir); + + par_time = (float)k / (float)(totkeys - 1); + par_co = parent_keys[k].co; + par_vel = parent_keys[k].vel; + par_rot = parent_keys[k].rot; + } + else { + float spiral_time = (float)(k - start_index) / (float)(extrakeys-1); + float kink[3], tmp[3]; + + /* use same time value for every point on the spiral */ + par_time = spiral_start_time; + par_co = spiral_par_co; + par_vel = spiral_par_vel; + par_rot = spiral_par_rot; + + project_v3_v3v3(tmp, kink_base, dir); + sub_v3_v3v3(kink, kink_base, tmp); + normalize_v3(kink); + + if (kink_axis_random > 0.0f) { + float a = kink_axis_random * (psys_frand(ctx->sim.psys, 7112 + seed) * 2.0f - 1.0f) * (float)M_PI; + float rot[3][3]; + + axis_angle_normalized_to_mat3(rot, dir, a); + mul_m3_v3(rot, kink); + } + + do_kink_spiral_deform((ParticleKey *)key, dir, kink, spiral_time, kink_freq, kink_shape, kink_amp, spiral_start); + } + + /* apply different deformations to the child path */ + do_child_modifiers(&ctx->sim, ptex, par_co, par_vel, par_rot, parent_orco, cpa, orco, hairmat, (ParticleKey *)key, par_time); + } + + totlen = 0.0f; + for (k = 0, key = keys; k < end_index-1; k++, key++) + totlen += len_v3v3((key+1)->co, key->co); + + *r_totkeys = end_index; + *r_max_length = totlen; +} + +/* ------------------------------------------------------------------------- */ + +static bool check_path_length(int k, ParticleCacheKey *keys, ParticleCacheKey *key, float max_length, float step_length, float *cur_length, float dvec[3]) +{ + if (*cur_length + step_length > max_length) { + sub_v3_v3v3(dvec, key->co, (key-1)->co); + mul_v3_fl(dvec, (max_length - *cur_length) / step_length); + add_v3_v3v3(key->co, (key-1)->co, dvec); + keys->segments = k; + /* something over the maximum step value */ + return false; + } + else { + *cur_length += step_length; + return true; + } +} + +void psys_apply_child_modifiers(ParticleThreadContext *ctx, struct ListBase *modifiers, + ChildParticle *cpa, ParticleTexture *ptex, const float orco[3], const float ornor[3], float hairmat[4][4], + ParticleCacheKey *keys, ParticleCacheKey *parent_keys, const float parent_orco[3]) +{ + struct ParticleSettings *part = ctx->sim.psys->part; + struct Material *ma = ctx->ma; + const bool draw_col_ma = (part->draw_col == PART_DRAW_COL_MAT); + const bool use_length_check = !ELEM(part->kink, PART_KINK_SPIRAL); + + ParticlePathModifier *mod; + ParticleCacheKey *key; + int totkeys, k; + float max_length; + +#if 0 /* TODO for the future: use true particle modifiers that work on the whole curve */ + for (mod = modifiers->first; mod; mod = mod->next) { + mod->apply(keys, totkeys, parent_keys); + } +#else + (void)modifiers; + (void)mod; + + if (part->kink == PART_KINK_SPIRAL) { + do_kink_spiral(ctx, ptex, parent_orco, cpa, orco, hairmat, keys, parent_keys, &totkeys, &max_length); + keys->segments = totkeys - 1; + } + else { + ParticlePathIterator iter; + + totkeys = ctx->segments + 1; + max_length = ptex->length; + + for (k = 0, key = keys; k < totkeys; k++, key++) { + ParticleKey *par; + + psys_path_iter_get(&iter, keys, totkeys, parent_keys, k); + par = (ParticleKey *)iter.parent_key; + + /* apply different deformations to the child path */ + do_child_modifiers(&ctx->sim, ptex, par->co, par->vel, iter.parent_rotation, parent_orco, cpa, orco, hairmat, (ParticleKey *)key, iter.time); + } + } + + { + const float step_length = 1.0f / (float)(totkeys - 1); + + float cur_length = 0.0f; + + /* we have to correct velocity because of kink & clump */ + for (k = 0, key = keys; k < totkeys; ++k, ++key) { + if (k >= 2) { + sub_v3_v3v3((key-1)->vel, key->co, (key-2)->co); + mul_v3_fl((key-1)->vel, 0.5); + + if (ma && draw_col_ma) + get_strand_normal(ma, ornor, cur_length, (key-1)->vel); + } + + if (use_length_check && k > 1) { + float dvec[3]; + /* check if path needs to be cut before actual end of data points */ + if (!check_path_length(k, keys, key, max_length, step_length, &cur_length, dvec)) { + /* last key */ + sub_v3_v3v3(key->vel, key->co, (key-1)->co); + if (ma && draw_col_ma) { + copy_v3_v3(key->col, &ma->r); + } + break; + } + } + if (k == totkeys-1) { + /* last key */ + sub_v3_v3v3(key->vel, key->co, (key-1)->co); + } + + if (ma && draw_col_ma) { + copy_v3_v3(key->col, &ma->r); + get_strand_normal(ma, ornor, cur_length, key->vel); + } + } + } +#endif +} + +/* ------------------------------------------------------------------------- */ + +void do_kink(ParticleKey *state, const float par_co[3], const float par_vel[3], const float par_rot[4], float time, float freq, float shape, + float amplitude, float flat, short type, short axis, float obmat[4][4], int smooth_start) +{ + float kink[3] = {1.f, 0.f, 0.f}, par_vec[3], q1[4] = {1.f, 0.f, 0.f, 0.f}; + float t, dt = 1.f, result[3]; + + if (ELEM(type, PART_KINK_NO, PART_KINK_SPIRAL)) + return; + + CLAMP(time, 0.f, 1.f); + + if (shape != 0.0f && !ELEM(type, PART_KINK_BRAID)) { + if (shape < 0.0f) + time = (float)pow(time, 1.f + shape); + else + time = (float)pow(time, 1.f / (1.f - shape)); + } + + t = time * freq * (float)M_PI; + + if (smooth_start) { + dt = fabsf(t); + /* smooth the beginning of kink */ + CLAMP(dt, 0.f, (float)M_PI); + dt = sinf(dt / 2.f); + } + + if (!ELEM(type, PART_KINK_RADIAL)) { + float temp[3]; + + kink[axis] = 1.f; + + if (obmat) + mul_mat3_m4_v3(obmat, kink); + + mul_qt_v3(par_rot, kink); + + /* make sure kink is normal to strand */ + project_v3_v3v3(temp, kink, par_vel); + sub_v3_v3(kink, temp); + normalize_v3(kink); + } + + copy_v3_v3(result, state->co); + sub_v3_v3v3(par_vec, par_co, state->co); + + switch (type) { + case PART_KINK_CURL: + { + float curl_offset[3]; + + /* rotate kink vector around strand tangent */ + mul_v3_v3fl(curl_offset, kink, amplitude); + axis_angle_to_quat(q1, par_vel, t); + mul_qt_v3(q1, curl_offset); + + interp_v3_v3v3(par_vec, state->co, par_co, flat); + add_v3_v3v3(result, par_vec, curl_offset); + break; + } + case PART_KINK_RADIAL: + { + if (flat > 0.f) { + float proj[3]; + /* flatten along strand */ + project_v3_v3v3(proj, par_vec, par_vel); + madd_v3_v3fl(result, proj, flat); + } + + madd_v3_v3fl(result, par_vec, -amplitude * sinf(t)); + break; + } + case PART_KINK_WAVE: + { + madd_v3_v3fl(result, kink, amplitude * sinf(t)); + + if (flat > 0.f) { + float proj[3]; + /* flatten along wave */ + project_v3_v3v3(proj, par_vec, kink); + madd_v3_v3fl(result, proj, flat); + + /* flatten along strand */ + project_v3_v3v3(proj, par_vec, par_vel); + madd_v3_v3fl(result, proj, flat); + } + break; + } + case PART_KINK_BRAID: + { + float y_vec[3] = {0.f, 1.f, 0.f}; + float z_vec[3] = {0.f, 0.f, 1.f}; + float vec_one[3], state_co[3]; + float inp_y, inp_z, length; + + if (par_rot) { + mul_qt_v3(par_rot, y_vec); + mul_qt_v3(par_rot, z_vec); + } + + negate_v3(par_vec); + normalize_v3_v3(vec_one, par_vec); + + inp_y = dot_v3v3(y_vec, vec_one); + inp_z = dot_v3v3(z_vec, vec_one); + + if (inp_y > 0.5f) { + copy_v3_v3(state_co, y_vec); + + mul_v3_fl(y_vec, amplitude * cosf(t)); + mul_v3_fl(z_vec, amplitude / 2.f * sinf(2.f * t)); + } + else if (inp_z > 0.0f) { + mul_v3_v3fl(state_co, z_vec, sinf((float)M_PI / 3.f)); + madd_v3_v3fl(state_co, y_vec, -0.5f); + + mul_v3_fl(y_vec, -amplitude * cosf(t + (float)M_PI / 3.f)); + mul_v3_fl(z_vec, amplitude / 2.f * cosf(2.f * t + (float)M_PI / 6.f)); + } + else { + mul_v3_v3fl(state_co, z_vec, -sinf((float)M_PI / 3.f)); + madd_v3_v3fl(state_co, y_vec, -0.5f); + + mul_v3_fl(y_vec, amplitude * -sinf(t + (float)M_PI / 6.f)); + mul_v3_fl(z_vec, amplitude / 2.f * -sinf(2.f * t + (float)M_PI / 3.f)); + } + + mul_v3_fl(state_co, amplitude); + add_v3_v3(state_co, par_co); + sub_v3_v3v3(par_vec, state->co, state_co); + + length = normalize_v3(par_vec); + mul_v3_fl(par_vec, MIN2(length, amplitude / 2.f)); + + add_v3_v3v3(state_co, par_co, y_vec); + add_v3_v3(state_co, z_vec); + add_v3_v3(state_co, par_vec); + + shape = 2.f * (float)M_PI * (1.f + shape); + + if (t < shape) { + shape = t / shape; + shape = (float)sqrt((double)shape); + interp_v3_v3v3(result, result, state_co, shape); + } + else { + copy_v3_v3(result, state_co); + } + break; + } + } + + /* blend the start of the kink */ + if (dt < 1.f) + interp_v3_v3v3(state->co, state->co, result, dt); + else + copy_v3_v3(state->co, result); +} + +static float do_clump_level(float result[3], const float co[3], const float par_co[3], float time, + float clumpfac, float clumppow, float pa_clump, CurveMapping *clumpcurve) +{ + float clump = 0.0f; + + if (clumpcurve) { + clump = pa_clump * (1.0f - CLAMPIS(curvemapping_evaluateF(clumpcurve, 0, time), 0.0f, 1.0f)); + + interp_v3_v3v3(result, co, par_co, clump); + } + else if (clumpfac != 0.0f) { + float cpow; + + if (clumppow < 0.0f) + cpow = 1.0f + clumppow; + else + cpow = 1.0f + 9.0f * clumppow; + + if (clumpfac < 0.0f) /* clump roots instead of tips */ + clump = -clumpfac * pa_clump * (float)pow(1.0 - (double)time, (double)cpow); + else + clump = clumpfac * pa_clump * (float)pow((double)time, (double)cpow); + + interp_v3_v3v3(result, co, par_co, clump); + } + + return clump; +} + +float do_clump(ParticleKey *state, const float par_co[3], float time, const float orco_offset[3], float clumpfac, float clumppow, float pa_clump, + bool use_clump_noise, float clump_noise_size, CurveMapping *clumpcurve) +{ + float clump; + + if (use_clump_noise && clump_noise_size != 0.0f) { + float center[3], noisevec[3]; + float da[4], pa[12]; + + mul_v3_v3fl(noisevec, orco_offset, 1.0f / clump_noise_size); + voronoi(noisevec[0], noisevec[1], noisevec[2], da, pa, 1.0f, 0); + mul_v3_fl(&pa[0], clump_noise_size); + add_v3_v3v3(center, par_co, &pa[0]); + + do_clump_level(state->co, state->co, center, time, clumpfac, clumppow, pa_clump, clumpcurve); + } + + clump = do_clump_level(state->co, state->co, par_co, time, clumpfac, clumppow, pa_clump, clumpcurve); + + return clump; +} + +static void do_rough(const float loc[3], float mat[4][4], float t, float fac, float size, float thres, ParticleKey *state) +{ + float rough[3]; + float rco[3]; + + if (thres != 0.0f) { + if (fabsf((float)(-1.5f + loc[0] + loc[1] + loc[2])) < 1.5f * thres) { + return; + } + } + + copy_v3_v3(rco, loc); + mul_v3_fl(rco, t); + rough[0] = -1.0f + 2.0f * BLI_gTurbulence(size, rco[0], rco[1], rco[2], 2, 0, 2); + rough[1] = -1.0f + 2.0f * BLI_gTurbulence(size, rco[1], rco[2], rco[0], 2, 0, 2); + rough[2] = -1.0f + 2.0f * BLI_gTurbulence(size, rco[2], rco[0], rco[1], 2, 0, 2); + + madd_v3_v3fl(state->co, mat[0], fac * rough[0]); + madd_v3_v3fl(state->co, mat[1], fac * rough[1]); + madd_v3_v3fl(state->co, mat[2], fac * rough[2]); +} + +static void do_rough_end(const float loc[3], float mat[4][4], float t, float fac, float shape, ParticleKey *state) +{ + float rough[2]; + float roughfac; + + roughfac = fac * (float)pow((double)t, shape); + copy_v2_v2(rough, loc); + rough[0] = -1.0f + 2.0f * rough[0]; + rough[1] = -1.0f + 2.0f * rough[1]; + mul_v2_fl(rough, roughfac); + + madd_v3_v3fl(state->co, mat[0], rough[0]); + madd_v3_v3fl(state->co, mat[1], rough[1]); +} + +static void do_rough_curve(const float loc[3], float mat[4][4], float time, float fac, float size, CurveMapping *roughcurve, ParticleKey *state) +{ + float rough[3]; + float rco[3]; + + if (!roughcurve) + return; + + fac *= CLAMPIS(curvemapping_evaluateF(roughcurve, 0, time), 0.0f, 1.0f); + + copy_v3_v3(rco, loc); + mul_v3_fl(rco, time); + rough[0] = -1.0f + 2.0f * BLI_gTurbulence(size, rco[0], rco[1], rco[2], 2, 0, 2); + rough[1] = -1.0f + 2.0f * BLI_gTurbulence(size, rco[1], rco[2], rco[0], 2, 0, 2); + rough[2] = -1.0f + 2.0f * BLI_gTurbulence(size, rco[2], rco[0], rco[1], 2, 0, 2); + + madd_v3_v3fl(state->co, mat[0], fac * rough[0]); + madd_v3_v3fl(state->co, mat[1], fac * rough[1]); + madd_v3_v3fl(state->co, mat[2], fac * rough[2]); +} + +void do_child_modifiers(ParticleSimulationData *sim, ParticleTexture *ptex, const float par_co[3], const float par_vel[3], const float par_rot[4], const float par_orco[3], + ChildParticle *cpa, const float orco[3], float mat[4][4], ParticleKey *state, float t) +{ + ParticleSettings *part = sim->psys->part; + CurveMapping *clumpcurve = (part->child_flag & PART_CHILD_USE_CLUMP_CURVE) ? part->clumpcurve : NULL; + CurveMapping *roughcurve = (part->child_flag & PART_CHILD_USE_ROUGH_CURVE) ? part->roughcurve : NULL; + int i = cpa - sim->psys->child; + int guided = 0; + + float kink_amp = part->kink_amp; + float kink_amp_clump = part->kink_amp_clump; + float kink_freq = part->kink_freq; + float rough1 = part->rough1; + float rough2 = part->rough2; + float rough_end = part->rough_end; + const bool smooth_start = (sim->psys->part->childtype == PART_CHILD_FACES); + + if (ptex) { + kink_amp *= ptex->kink_amp; + kink_freq *= ptex->kink_freq; + rough1 *= ptex->rough1; + rough2 *= ptex->rough2; + rough_end *= ptex->roughe; + } + + if (part->flag & PART_CHILD_EFFECT) + /* state is safe to cast, since only co and vel are used */ + guided = do_guides(sim->psys->part, sim->psys->effectors, (ParticleKey *)state, cpa->parent, t); + + if (guided == 0) { + float orco_offset[3]; + float clump; + + sub_v3_v3v3(orco_offset, orco, par_orco); + clump = do_clump(state, par_co, t, orco_offset, part->clumpfac, part->clumppow, ptex ? ptex->clump : 1.f, + part->child_flag & PART_CHILD_USE_CLUMP_NOISE, part->clump_noise_size, clumpcurve); + + if (kink_freq != 0.f) { + kink_amp *= (1.f - kink_amp_clump * clump); + + do_kink(state, par_co, par_vel, par_rot, t, kink_freq, part->kink_shape, + kink_amp, part->kink_flat, part->kink, part->kink_axis, + sim->ob->obmat, smooth_start); + } + } + + if (roughcurve) { + do_rough_curve(orco, mat, t, rough1, part->rough1_size, roughcurve, state); + } + else { + if (rough1 > 0.f) + do_rough(orco, mat, t, rough1, part->rough1_size, 0.0, state); + + if (rough2 > 0.f) { + float vec[3]; + psys_frand_vec(sim->psys, i + 27, vec); + do_rough(vec, mat, t, rough2, part->rough2_size, part->rough2_thres, state); + } + + if (rough_end > 0.f) { + float vec[3]; + psys_frand_vec(sim->psys, i + 27, vec); + do_rough_end(vec, mat, t, rough_end, part->rough_end_shape, state); + } + } +} |