1214 lines
33 KiB
C
1214 lines
33 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/blenkernel/intern/effect.c
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* \ingroup bke
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*/
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#include <stddef.h>
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#include <stdarg.h>
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#include <math.h>
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#include <stdlib.h>
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#include "MEM_guardedalloc.h"
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#include "DNA_curve_types.h"
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#include "DNA_group_types.h"
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#include "DNA_listBase.h"
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#include "DNA_meshdata_types.h"
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#include "DNA_object_types.h"
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#include "DNA_object_force_types.h"
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#include "DNA_particle_types.h"
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#include "DNA_texture_types.h"
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#include "DNA_scene_types.h"
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#include "BLI_math.h"
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#include "BLI_blenlib.h"
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#include "BLI_noise.h"
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#include "BLI_rand.h"
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#include "BLI_utildefines.h"
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#include "BLI_ghash.h"
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#include "PIL_time.h"
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#include "BKE_anim.h" /* needed for where_on_path */
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#include "BKE_collision.h"
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#include "BKE_curve.h"
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#include "BKE_displist.h"
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#include "BKE_DerivedMesh.h"
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#include "BKE_cdderivedmesh.h"
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#include "BKE_effect.h"
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#include "BKE_global.h"
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#include "BKE_library.h"
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#include "BKE_modifier.h"
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#include "BKE_object.h"
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#include "BKE_particle.h"
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#include "BKE_scene.h"
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#include "BKE_smoke.h"
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#include "RE_render_ext.h"
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#include "RE_shader_ext.h"
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/* fluid sim particle import */
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#ifdef WITH_MOD_FLUID
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#include "LBM_fluidsim.h"
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#include <zlib.h>
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#include <string.h>
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#endif // WITH_MOD_FLUID
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EffectorWeights *BKE_add_effector_weights(Group *group)
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{
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EffectorWeights *weights = MEM_callocN(sizeof(EffectorWeights), "EffectorWeights");
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int i;
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for (i=0; i<NUM_PFIELD_TYPES; i++)
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weights->weight[i] = 1.0f;
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weights->global_gravity = 1.0f;
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weights->group = group;
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return weights;
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}
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PartDeflect *object_add_collision_fields(int type)
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{
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PartDeflect *pd;
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pd= MEM_callocN(sizeof(PartDeflect), "PartDeflect");
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pd->forcefield = type;
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pd->pdef_sbdamp = 0.1f;
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pd->pdef_sbift = 0.2f;
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pd->pdef_sboft = 0.02f;
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pd->seed = ((unsigned int)(ceil(PIL_check_seconds_timer()))+1) % 128;
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pd->f_strength = 1.0f;
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pd->f_damp = 1.0f;
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/* set sensible defaults based on type */
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switch (type) {
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case PFIELD_VORTEX:
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pd->shape = PFIELD_SHAPE_PLANE;
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break;
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case PFIELD_WIND:
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pd->shape = PFIELD_SHAPE_PLANE;
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pd->f_flow = 1.0f; /* realistic wind behavior */
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break;
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case PFIELD_TEXTURE:
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pd->f_size = 1.0f;
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break;
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case PFIELD_SMOKEFLOW:
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pd->f_flow = 1.0f;
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break;
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}
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pd->flag = PFIELD_DO_LOCATION|PFIELD_DO_ROTATION;
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return pd;
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}
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/* ***************** PARTICLES ***************** */
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/* -------------------------- Effectors ------------------ */
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void free_partdeflect(PartDeflect *pd)
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{
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if (!pd)
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return;
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if (pd->rng)
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BLI_rng_free(pd->rng);
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MEM_freeN(pd);
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}
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static EffectorCache *new_effector_cache(Scene *scene, Object *ob, ParticleSystem *psys, PartDeflect *pd)
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{
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EffectorCache *eff = MEM_callocN(sizeof(EffectorCache), "EffectorCache");
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eff->scene = scene;
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eff->ob = ob;
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eff->psys = psys;
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eff->pd = pd;
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eff->frame = -1;
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return eff;
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}
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static void add_object_to_effectors(ListBase **effectors, Scene *scene, EffectorWeights *weights, Object *ob, Object *ob_src, bool for_simulation)
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{
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EffectorCache *eff = NULL;
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if ( ob == ob_src )
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return;
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if (for_simulation) {
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if (weights->weight[ob->pd->forcefield] == 0.0f )
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return;
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if (ob->pd->shape == PFIELD_SHAPE_POINTS && !ob->derivedFinal )
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return;
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}
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if (*effectors == NULL)
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*effectors = MEM_callocN(sizeof(ListBase), "effectors list");
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eff = new_effector_cache(scene, ob, NULL, ob->pd);
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/* make sure imat is up to date */
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invert_m4_m4(ob->imat, ob->obmat);
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BLI_addtail(*effectors, eff);
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}
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static void add_particles_to_effectors(ListBase **effectors, Scene *scene, EffectorWeights *weights, Object *ob, ParticleSystem *psys, ParticleSystem *psys_src, bool for_simulation)
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{
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ParticleSettings *part= psys->part;
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if ( !psys_check_enabled(ob, psys, G.is_rendering) )
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return;
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if ( psys == psys_src && (part->flag & PART_SELF_EFFECT) == 0)
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return;
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if ( part->pd && part->pd->forcefield && (!for_simulation || weights->weight[part->pd->forcefield] != 0.0f)) {
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if (*effectors == NULL)
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*effectors = MEM_callocN(sizeof(ListBase), "effectors list");
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BLI_addtail(*effectors, new_effector_cache(scene, ob, psys, part->pd));
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}
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if (part->pd2 && part->pd2->forcefield && (!for_simulation || weights->weight[part->pd2->forcefield] != 0.0f)) {
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if (*effectors == NULL)
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*effectors = MEM_callocN(sizeof(ListBase), "effectors list");
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BLI_addtail(*effectors, new_effector_cache(scene, ob, psys, part->pd2));
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}
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}
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/* returns ListBase handle with objects taking part in the effecting */
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ListBase *pdInitEffectors(Scene *scene, Object *ob_src, ParticleSystem *psys_src,
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EffectorWeights *weights, bool for_simulation)
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{
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Base *base;
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unsigned int layer= ob_src->lay;
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ListBase *effectors = NULL;
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if (weights->group) {
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GroupObject *go;
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for (go= weights->group->gobject.first; go; go= go->next) {
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if ( (go->ob->lay & layer) ) {
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if ( go->ob->pd && go->ob->pd->forcefield )
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add_object_to_effectors(&effectors, scene, weights, go->ob, ob_src, for_simulation);
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if ( go->ob->particlesystem.first ) {
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ParticleSystem *psys= go->ob->particlesystem.first;
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for ( ; psys; psys=psys->next )
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add_particles_to_effectors(&effectors, scene, weights, go->ob, psys, psys_src, for_simulation);
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}
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}
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}
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}
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else {
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for (base = scene->base.first; base; base= base->next) {
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if ( (base->lay & layer) ) {
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if ( base->object->pd && base->object->pd->forcefield )
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add_object_to_effectors(&effectors, scene, weights, base->object, ob_src, for_simulation);
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if ( base->object->particlesystem.first ) {
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ParticleSystem *psys= base->object->particlesystem.first;
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for ( ; psys; psys=psys->next )
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add_particles_to_effectors(&effectors, scene, weights, base->object, psys, psys_src, for_simulation);
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}
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}
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}
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}
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if (for_simulation)
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pdPrecalculateEffectors(effectors);
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return effectors;
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}
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void pdEndEffectors(ListBase **effectors)
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{
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if (*effectors) {
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EffectorCache *eff = (*effectors)->first;
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for (; eff; eff=eff->next) {
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if (eff->guide_data)
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MEM_freeN(eff->guide_data);
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}
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BLI_freelistN(*effectors);
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MEM_freeN(*effectors);
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*effectors = NULL;
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}
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}
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static void precalculate_effector(EffectorCache *eff)
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{
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unsigned int cfra = (unsigned int)(eff->scene->r.cfra >= 0 ? eff->scene->r.cfra : -eff->scene->r.cfra);
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if (!eff->pd->rng)
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eff->pd->rng = BLI_rng_new(eff->pd->seed + cfra);
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else
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BLI_rng_srandom(eff->pd->rng, eff->pd->seed + cfra);
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if (eff->pd->forcefield == PFIELD_GUIDE && eff->ob->type==OB_CURVE) {
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Curve *cu= eff->ob->data;
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if (cu->flag & CU_PATH) {
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if (eff->ob->curve_cache == NULL || eff->ob->curve_cache->path==NULL || eff->ob->curve_cache->path->data==NULL)
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BKE_displist_make_curveTypes(eff->scene, eff->ob, 0);
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if (eff->ob->curve_cache->path && eff->ob->curve_cache->path->data) {
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where_on_path(eff->ob, 0.0, eff->guide_loc, eff->guide_dir, NULL, &eff->guide_radius, NULL);
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mul_m4_v3(eff->ob->obmat, eff->guide_loc);
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mul_mat3_m4_v3(eff->ob->obmat, eff->guide_dir);
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}
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}
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}
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else if (eff->pd->shape == PFIELD_SHAPE_SURFACE) {
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eff->surmd = (SurfaceModifierData *)modifiers_findByType( eff->ob, eModifierType_Surface );
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if (eff->ob->type == OB_CURVE)
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eff->flag |= PE_USE_NORMAL_DATA;
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}
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else if (eff->psys)
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psys_update_particle_tree(eff->psys, eff->scene->r.cfra);
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/* Store object velocity */
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if (eff->ob) {
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float old_vel[3];
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BKE_object_where_is_calc_time(eff->scene, eff->ob, cfra - 1.0f);
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copy_v3_v3(old_vel, eff->ob->obmat[3]);
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BKE_object_where_is_calc_time(eff->scene, eff->ob, cfra);
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sub_v3_v3v3(eff->velocity, eff->ob->obmat[3], old_vel);
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}
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}
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void pdPrecalculateEffectors(ListBase *effectors)
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{
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if (effectors) {
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EffectorCache *eff = effectors->first;
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for (; eff; eff=eff->next)
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precalculate_effector(eff);
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}
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}
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void pd_point_from_particle(ParticleSimulationData *sim, ParticleData *pa, ParticleKey *state, EffectedPoint *point)
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{
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ParticleSettings *part = sim->psys->part;
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point->loc = state->co;
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point->vel = state->vel;
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point->index = pa - sim->psys->particles;
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point->size = pa->size;
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point->charge = 0.0f;
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if (part->pd && part->pd->forcefield == PFIELD_CHARGE)
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point->charge += part->pd->f_strength;
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if (part->pd2 && part->pd2->forcefield == PFIELD_CHARGE)
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point->charge += part->pd2->f_strength;
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point->vel_to_sec = 1.0f;
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point->vel_to_frame = psys_get_timestep(sim);
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point->flag = 0;
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if (sim->psys->part->flag & PART_ROT_DYN) {
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point->ave = state->ave;
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point->rot = state->rot;
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}
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else
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point->ave = point->rot = NULL;
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point->psys = sim->psys;
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}
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void pd_point_from_loc(Scene *scene, float *loc, float *vel, int index, EffectedPoint *point)
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{
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point->loc = loc;
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point->vel = vel;
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point->index = index;
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point->size = 0.0f;
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point->vel_to_sec = (float)scene->r.frs_sec;
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point->vel_to_frame = 1.0f;
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point->flag = 0;
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point->ave = point->rot = NULL;
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point->psys = NULL;
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}
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void pd_point_from_soft(Scene *scene, float *loc, float *vel, int index, EffectedPoint *point)
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{
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point->loc = loc;
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point->vel = vel;
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point->index = index;
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point->size = 0.0f;
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point->vel_to_sec = (float)scene->r.frs_sec;
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point->vel_to_frame = 1.0f;
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point->flag = PE_WIND_AS_SPEED;
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point->ave = point->rot = NULL;
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point->psys = NULL;
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}
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/************************************************/
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/* Effectors */
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/************************************************/
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// triangle - ray callback function
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static void eff_tri_ray_hit(void *UNUSED(userData), int UNUSED(index), const BVHTreeRay *UNUSED(ray), BVHTreeRayHit *hit)
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{
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/* whenever we hit a bounding box, we don't check further */
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hit->dist = -1;
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hit->index = 1;
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}
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// get visibility of a wind ray
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static float eff_calc_visibility(ListBase *colliders, EffectorCache *eff, EffectorData *efd, EffectedPoint *point)
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{
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const int raycast_flag = BVH_RAYCAST_DEFAULT & ~(BVH_RAYCAST_WATERTIGHT);
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ListBase *colls = colliders;
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ColliderCache *col;
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float norm[3], len = 0.0;
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float visibility = 1.0, absorption = 0.0;
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if (!(eff->pd->flag & PFIELD_VISIBILITY))
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return visibility;
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if (!colls)
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colls = get_collider_cache(eff->scene, eff->ob, NULL);
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if (!colls)
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return visibility;
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negate_v3_v3(norm, efd->vec_to_point);
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len = normalize_v3(norm);
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/* check all collision objects */
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for (col = colls->first; col; col = col->next) {
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CollisionModifierData *collmd = col->collmd;
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if (col->ob == eff->ob)
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continue;
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if (collmd->bvhtree) {
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BVHTreeRayHit hit;
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hit.index = -1;
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hit.dist = len + FLT_EPSILON;
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/* check if the way is blocked */
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if (BLI_bvhtree_ray_cast_ex(
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collmd->bvhtree, point->loc, norm, 0.0f, &hit,
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eff_tri_ray_hit, NULL, raycast_flag) != -1)
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{
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absorption= col->ob->pd->absorption;
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/* visibility is only between 0 and 1, calculated from 1-absorption */
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visibility *= CLAMPIS(1.0f-absorption, 0.0f, 1.0f);
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if (visibility <= 0.0f)
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break;
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}
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}
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}
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if (!colliders)
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free_collider_cache(&colls);
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return visibility;
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}
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// noise function for wind e.g.
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static float wind_func(struct RNG *rng, float strength)
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{
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int random = (BLI_rng_get_int(rng)+1) % 128; // max 2357
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float force = BLI_rng_get_float(rng) + 1.0f;
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float ret;
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float sign = 0;
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sign = ((float)random > 64.0f) ? 1.0f: -1.0f; // dividing by 2 is not giving equal sign distribution
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ret = sign*((float)random / force)*strength/128.0f;
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return ret;
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}
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/* maxdist: zero effect from this distance outwards (if usemax) */
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/* mindist: full effect up to this distance (if usemin) */
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/* power: falloff with formula 1/r^power */
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static float falloff_func(float fac, int usemin, float mindist, int usemax, float maxdist, float power)
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{
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/* first quick checks */
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if (usemax && fac > maxdist)
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return 0.0f;
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if (usemin && fac < mindist)
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return 1.0f;
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if (!usemin)
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mindist = 0.0;
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return pow((double)(1.0f+fac-mindist), (double)(-power));
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}
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static float falloff_func_dist(PartDeflect *pd, float fac)
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{
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return falloff_func(fac, pd->flag&PFIELD_USEMIN, pd->mindist, pd->flag&PFIELD_USEMAX, pd->maxdist, pd->f_power);
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}
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static float falloff_func_rad(PartDeflect *pd, float fac)
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{
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return falloff_func(fac, pd->flag&PFIELD_USEMINR, pd->minrad, pd->flag&PFIELD_USEMAXR, pd->maxrad, pd->f_power_r);
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}
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float effector_falloff(EffectorCache *eff, EffectorData *efd, EffectedPoint *UNUSED(point), EffectorWeights *weights)
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{
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float temp[3];
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float falloff = weights ? weights->weight[0] * weights->weight[eff->pd->forcefield] : 1.0f;
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float fac, r_fac;
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|
|
fac = dot_v3v3(efd->nor, efd->vec_to_point2);
|
|
|
|
if (eff->pd->zdir == PFIELD_Z_POS && fac < 0.0f)
|
|
falloff=0.0f;
|
|
else if (eff->pd->zdir == PFIELD_Z_NEG && fac > 0.0f)
|
|
falloff=0.0f;
|
|
else {
|
|
switch (eff->pd->falloff) {
|
|
case PFIELD_FALL_SPHERE:
|
|
falloff*= falloff_func_dist(eff->pd, efd->distance);
|
|
break;
|
|
|
|
case PFIELD_FALL_TUBE:
|
|
falloff*= falloff_func_dist(eff->pd, ABS(fac));
|
|
if (falloff == 0.0f)
|
|
break;
|
|
|
|
madd_v3_v3v3fl(temp, efd->vec_to_point2, efd->nor, -fac);
|
|
r_fac= len_v3(temp);
|
|
falloff*= falloff_func_rad(eff->pd, r_fac);
|
|
break;
|
|
case PFIELD_FALL_CONE:
|
|
falloff*= falloff_func_dist(eff->pd, ABS(fac));
|
|
if (falloff == 0.0f)
|
|
break;
|
|
|
|
r_fac= RAD2DEGF(saacos(fac/len_v3(efd->vec_to_point)));
|
|
falloff*= falloff_func_rad(eff->pd, r_fac);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return falloff;
|
|
}
|
|
|
|
int closest_point_on_surface(SurfaceModifierData *surmd, const float co[3], float surface_co[3], float surface_nor[3], float surface_vel[3])
|
|
{
|
|
BVHTreeNearest nearest;
|
|
|
|
nearest.index = -1;
|
|
nearest.dist_sq = FLT_MAX;
|
|
|
|
BLI_bvhtree_find_nearest(surmd->bvhtree->tree, co, &nearest, surmd->bvhtree->nearest_callback, surmd->bvhtree);
|
|
|
|
if (nearest.index != -1) {
|
|
copy_v3_v3(surface_co, nearest.co);
|
|
|
|
if (surface_nor) {
|
|
copy_v3_v3(surface_nor, nearest.no);
|
|
}
|
|
|
|
if (surface_vel) {
|
|
const MLoop *mloop = surmd->bvhtree->loop;
|
|
const MLoopTri *lt = &surmd->bvhtree->looptri[nearest.index];
|
|
|
|
copy_v3_v3(surface_vel, surmd->v[mloop[lt->tri[0]].v].co);
|
|
add_v3_v3(surface_vel, surmd->v[mloop[lt->tri[1]].v].co);
|
|
add_v3_v3(surface_vel, surmd->v[mloop[lt->tri[2]].v].co);
|
|
|
|
mul_v3_fl(surface_vel, (1.0f / 3.0f));
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
int get_effector_data(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, int real_velocity)
|
|
{
|
|
float cfra = eff->scene->r.cfra;
|
|
int ret = 0;
|
|
|
|
/* In case surface object is in Edit mode when loading the .blend, surface modifier is never executed
|
|
* and bvhtree never built, see T48415. */
|
|
if (eff->pd && eff->pd->shape==PFIELD_SHAPE_SURFACE && eff->surmd && eff->surmd->bvhtree) {
|
|
/* closest point in the object surface is an effector */
|
|
float vec[3];
|
|
|
|
/* using velocity corrected location allows for easier sliding over effector surface */
|
|
copy_v3_v3(vec, point->vel);
|
|
mul_v3_fl(vec, point->vel_to_frame);
|
|
add_v3_v3(vec, point->loc);
|
|
|
|
ret = closest_point_on_surface(eff->surmd, vec, efd->loc, efd->nor, real_velocity ? efd->vel : NULL);
|
|
|
|
efd->size = 0.0f;
|
|
}
|
|
else if (eff->pd && eff->pd->shape==PFIELD_SHAPE_POINTS) {
|
|
|
|
if (eff->ob->derivedFinal) {
|
|
DerivedMesh *dm = eff->ob->derivedFinal;
|
|
|
|
dm->getVertCo(dm, *efd->index, efd->loc);
|
|
dm->getVertNo(dm, *efd->index, efd->nor);
|
|
|
|
mul_m4_v3(eff->ob->obmat, efd->loc);
|
|
mul_mat3_m4_v3(eff->ob->obmat, efd->nor);
|
|
|
|
normalize_v3(efd->nor);
|
|
|
|
efd->size = 0.0f;
|
|
|
|
/**/
|
|
ret = 1;
|
|
}
|
|
}
|
|
else if (eff->psys) {
|
|
ParticleData *pa = eff->psys->particles + *efd->index;
|
|
ParticleKey state;
|
|
|
|
/* exclude the particle itself for self effecting particles */
|
|
if (eff->psys == point->psys && *efd->index == point->index) {
|
|
/* pass */
|
|
}
|
|
else {
|
|
ParticleSimulationData sim= {NULL};
|
|
sim.scene= eff->scene;
|
|
sim.ob= eff->ob;
|
|
sim.psys= eff->psys;
|
|
|
|
/* TODO: time from actual previous calculated frame (step might not be 1) */
|
|
state.time = cfra - 1.0f;
|
|
ret = psys_get_particle_state(&sim, *efd->index, &state, 0);
|
|
|
|
/* TODO */
|
|
//if (eff->pd->forcefiled == PFIELD_HARMONIC && ret==0) {
|
|
// if (pa->dietime < eff->psys->cfra)
|
|
// eff->flag |= PE_VELOCITY_TO_IMPULSE;
|
|
//}
|
|
|
|
copy_v3_v3(efd->loc, state.co);
|
|
|
|
/* rather than use the velocity use rotated x-axis (defaults to velocity) */
|
|
efd->nor[0] = 1.f;
|
|
efd->nor[1] = efd->nor[2] = 0.f;
|
|
mul_qt_v3(state.rot, efd->nor);
|
|
|
|
if (real_velocity)
|
|
copy_v3_v3(efd->vel, state.vel);
|
|
|
|
efd->size = pa->size;
|
|
}
|
|
}
|
|
else {
|
|
/* use center of object for distance calculus */
|
|
const Object *ob = eff->ob;
|
|
|
|
/* use z-axis as normal*/
|
|
normalize_v3_v3(efd->nor, ob->obmat[2]);
|
|
|
|
if (eff->pd && eff->pd->shape == PFIELD_SHAPE_PLANE) {
|
|
float temp[3], translate[3];
|
|
sub_v3_v3v3(temp, point->loc, ob->obmat[3]);
|
|
project_v3_v3v3(translate, temp, efd->nor);
|
|
|
|
/* for vortex the shape chooses between old / new force */
|
|
if (eff->pd->forcefield == PFIELD_VORTEX)
|
|
add_v3_v3v3(efd->loc, ob->obmat[3], translate);
|
|
else /* normally efd->loc is closest point on effector xy-plane */
|
|
sub_v3_v3v3(efd->loc, point->loc, translate);
|
|
}
|
|
else {
|
|
copy_v3_v3(efd->loc, ob->obmat[3]);
|
|
}
|
|
|
|
if (real_velocity)
|
|
copy_v3_v3(efd->vel, eff->velocity);
|
|
|
|
efd->size = 0.0f;
|
|
|
|
ret = 1;
|
|
}
|
|
|
|
if (ret) {
|
|
sub_v3_v3v3(efd->vec_to_point, point->loc, efd->loc);
|
|
efd->distance = len_v3(efd->vec_to_point);
|
|
|
|
/* rest length for harmonic effector, will have to see later if this could be extended to other effectors */
|
|
if (eff->pd && eff->pd->forcefield == PFIELD_HARMONIC && eff->pd->f_size)
|
|
mul_v3_fl(efd->vec_to_point, (efd->distance-eff->pd->f_size)/efd->distance);
|
|
|
|
if (eff->flag & PE_USE_NORMAL_DATA) {
|
|
copy_v3_v3(efd->vec_to_point2, efd->vec_to_point);
|
|
copy_v3_v3(efd->nor2, efd->nor);
|
|
}
|
|
else {
|
|
/* for some effectors we need the object center every time */
|
|
sub_v3_v3v3(efd->vec_to_point2, point->loc, eff->ob->obmat[3]);
|
|
normalize_v3_v3(efd->nor2, eff->ob->obmat[2]);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
static void get_effector_tot(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, int *tot, int *p, int *step)
|
|
{
|
|
*p = 0;
|
|
efd->index = p;
|
|
|
|
if (eff->pd->shape == PFIELD_SHAPE_POINTS) {
|
|
*tot = eff->ob->derivedFinal ? eff->ob->derivedFinal->numVertData : 1;
|
|
|
|
if (*tot && eff->pd->forcefield == PFIELD_HARMONIC && point->index >= 0) {
|
|
*p = point->index % *tot;
|
|
*tot = *p+1;
|
|
}
|
|
}
|
|
else if (eff->psys) {
|
|
*tot = eff->psys->totpart;
|
|
|
|
if (eff->pd->forcefield == PFIELD_CHARGE) {
|
|
/* Only the charge of the effected particle is used for
|
|
* interaction, not fall-offs. If the fall-offs aren't the
|
|
* same this will be unphysical, but for animation this
|
|
* could be the wanted behavior. If you want physical
|
|
* correctness the fall-off should be spherical 2.0 anyways.
|
|
*/
|
|
efd->charge = eff->pd->f_strength;
|
|
}
|
|
else if (eff->pd->forcefield == PFIELD_HARMONIC && (eff->pd->flag & PFIELD_MULTIPLE_SPRINGS)==0) {
|
|
/* every particle is mapped to only one harmonic effector particle */
|
|
*p= point->index % eff->psys->totpart;
|
|
*tot= *p + 1;
|
|
}
|
|
|
|
if (eff->psys->part->effector_amount) {
|
|
int totpart = eff->psys->totpart;
|
|
int amount = eff->psys->part->effector_amount;
|
|
|
|
*step = (totpart > amount) ? totpart/amount : 1;
|
|
}
|
|
}
|
|
else {
|
|
*tot = 1;
|
|
}
|
|
}
|
|
static void do_texture_effector(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, float *total_force)
|
|
{
|
|
TexResult result[4];
|
|
float tex_co[3], strength, force[3];
|
|
float nabla = eff->pd->tex_nabla;
|
|
int hasrgb;
|
|
short mode = eff->pd->tex_mode;
|
|
bool scene_color_manage;
|
|
|
|
if (!eff->pd->tex)
|
|
return;
|
|
|
|
result[0].nor = result[1].nor = result[2].nor = result[3].nor = NULL;
|
|
|
|
strength= eff->pd->f_strength * efd->falloff;
|
|
|
|
copy_v3_v3(tex_co, point->loc);
|
|
|
|
if (eff->pd->flag & PFIELD_TEX_OBJECT) {
|
|
mul_m4_v3(eff->ob->imat, tex_co);
|
|
|
|
if (eff->pd->flag & PFIELD_TEX_2D)
|
|
tex_co[2] = 0.0f;
|
|
}
|
|
else if (eff->pd->flag & PFIELD_TEX_2D) {
|
|
float fac=-dot_v3v3(tex_co, efd->nor);
|
|
madd_v3_v3fl(tex_co, efd->nor, fac);
|
|
}
|
|
|
|
scene_color_manage = BKE_scene_check_color_management_enabled(eff->scene);
|
|
|
|
hasrgb = multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result, 0, NULL, scene_color_manage, false);
|
|
|
|
if (hasrgb && mode==PFIELD_TEX_RGB) {
|
|
force[0] = (0.5f - result->tr) * strength;
|
|
force[1] = (0.5f - result->tg) * strength;
|
|
force[2] = (0.5f - result->tb) * strength;
|
|
}
|
|
else if (nabla != 0) {
|
|
strength/=nabla;
|
|
|
|
tex_co[0] += nabla;
|
|
multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result+1, 0, NULL, scene_color_manage, false);
|
|
|
|
tex_co[0] -= nabla;
|
|
tex_co[1] += nabla;
|
|
multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result+2, 0, NULL, scene_color_manage, false);
|
|
|
|
tex_co[1] -= nabla;
|
|
tex_co[2] += nabla;
|
|
multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result+3, 0, NULL, scene_color_manage, false);
|
|
|
|
if (mode == PFIELD_TEX_GRAD || !hasrgb) { /* if we don't have rgb fall back to grad */
|
|
/* generate intensity if texture only has rgb value */
|
|
if (hasrgb & TEX_RGB) {
|
|
int i;
|
|
for (i=0; i<4; i++)
|
|
result[i].tin = (1.0f / 3.0f) * (result[i].tr + result[i].tg + result[i].tb);
|
|
}
|
|
force[0] = (result[0].tin - result[1].tin) * strength;
|
|
force[1] = (result[0].tin - result[2].tin) * strength;
|
|
force[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;
|
|
|
|
force[0] = (dbdy - dgdz) * strength;
|
|
force[1] = (drdz - dbdx) * strength;
|
|
force[2] = (dgdx - drdy) * strength;
|
|
}
|
|
}
|
|
else {
|
|
zero_v3(force);
|
|
}
|
|
|
|
if (eff->pd->flag & PFIELD_TEX_2D) {
|
|
float fac = -dot_v3v3(force, efd->nor);
|
|
madd_v3_v3fl(force, efd->nor, fac);
|
|
}
|
|
|
|
add_v3_v3(total_force, force);
|
|
}
|
|
static void do_physical_effector(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, float *total_force)
|
|
{
|
|
PartDeflect *pd = eff->pd;
|
|
RNG *rng = pd->rng;
|
|
float force[3] = {0, 0, 0};
|
|
float temp[3];
|
|
float fac;
|
|
float strength = pd->f_strength;
|
|
float damp = pd->f_damp;
|
|
float noise_factor = pd->f_noise;
|
|
|
|
if (noise_factor > 0.0f) {
|
|
strength += wind_func(rng, noise_factor);
|
|
|
|
if (ELEM(pd->forcefield, PFIELD_HARMONIC, PFIELD_DRAG))
|
|
damp += wind_func(rng, noise_factor);
|
|
}
|
|
|
|
copy_v3_v3(force, efd->vec_to_point);
|
|
|
|
switch (pd->forcefield) {
|
|
case PFIELD_WIND:
|
|
copy_v3_v3(force, efd->nor);
|
|
mul_v3_fl(force, strength * efd->falloff);
|
|
break;
|
|
case PFIELD_FORCE:
|
|
normalize_v3(force);
|
|
if (pd->flag & PFIELD_GRAVITATION){ /* Option: Multiply by 1/distance^2 */
|
|
if (efd->distance < FLT_EPSILON){
|
|
strength = 0.0f;
|
|
}
|
|
else {
|
|
strength *= powf(efd->distance, -2.0f);
|
|
}
|
|
}
|
|
mul_v3_fl(force, strength * efd->falloff);
|
|
break;
|
|
case PFIELD_VORTEX:
|
|
/* old vortex force */
|
|
if (pd->shape == PFIELD_SHAPE_POINT) {
|
|
cross_v3_v3v3(force, efd->nor, efd->vec_to_point);
|
|
normalize_v3(force);
|
|
mul_v3_fl(force, strength * efd->distance * efd->falloff);
|
|
}
|
|
else {
|
|
/* new vortex force */
|
|
cross_v3_v3v3(temp, efd->nor2, efd->vec_to_point2);
|
|
mul_v3_fl(temp, strength * efd->falloff);
|
|
|
|
cross_v3_v3v3(force, efd->nor2, temp);
|
|
mul_v3_fl(force, strength * efd->falloff);
|
|
|
|
madd_v3_v3fl(temp, point->vel, -point->vel_to_sec);
|
|
add_v3_v3(force, temp);
|
|
}
|
|
break;
|
|
case PFIELD_MAGNET:
|
|
if (eff->pd->shape == PFIELD_SHAPE_POINT)
|
|
/* magnetic field of a moving charge */
|
|
cross_v3_v3v3(temp, efd->nor, efd->vec_to_point);
|
|
else
|
|
copy_v3_v3(temp, efd->nor);
|
|
|
|
normalize_v3(temp);
|
|
mul_v3_fl(temp, strength * efd->falloff);
|
|
cross_v3_v3v3(force, point->vel, temp);
|
|
mul_v3_fl(force, point->vel_to_sec);
|
|
break;
|
|
case PFIELD_HARMONIC:
|
|
mul_v3_fl(force, -strength * efd->falloff);
|
|
copy_v3_v3(temp, point->vel);
|
|
mul_v3_fl(temp, -damp * 2.0f * sqrtf(fabsf(strength)) * point->vel_to_sec);
|
|
add_v3_v3(force, temp);
|
|
break;
|
|
case PFIELD_CHARGE:
|
|
mul_v3_fl(force, point->charge * strength * efd->falloff);
|
|
break;
|
|
case PFIELD_LENNARDJ:
|
|
fac = pow((efd->size + point->size) / efd->distance, 6.0);
|
|
|
|
fac = - fac * (1.0f - fac) / efd->distance;
|
|
|
|
/* limit the repulsive term drastically to avoid huge forces */
|
|
fac = ((fac>2.0f) ? 2.0f : fac);
|
|
|
|
mul_v3_fl(force, strength * fac);
|
|
break;
|
|
case PFIELD_BOID:
|
|
/* Boid field is handled completely in boids code. */
|
|
return;
|
|
case PFIELD_TURBULENCE:
|
|
if (pd->flag & PFIELD_GLOBAL_CO) {
|
|
copy_v3_v3(temp, point->loc);
|
|
}
|
|
else {
|
|
add_v3_v3v3(temp, efd->vec_to_point2, efd->nor2);
|
|
}
|
|
force[0] = -1.0f + 2.0f * BLI_gTurbulence(pd->f_size, temp[0], temp[1], temp[2], 2, 0, 2);
|
|
force[1] = -1.0f + 2.0f * BLI_gTurbulence(pd->f_size, temp[1], temp[2], temp[0], 2, 0, 2);
|
|
force[2] = -1.0f + 2.0f * BLI_gTurbulence(pd->f_size, temp[2], temp[0], temp[1], 2, 0, 2);
|
|
mul_v3_fl(force, strength * efd->falloff);
|
|
break;
|
|
case PFIELD_DRAG:
|
|
copy_v3_v3(force, point->vel);
|
|
fac = normalize_v3(force) * point->vel_to_sec;
|
|
|
|
strength = MIN2(strength, 2.0f);
|
|
damp = MIN2(damp, 2.0f);
|
|
|
|
mul_v3_fl(force, -efd->falloff * fac * (strength * fac + damp));
|
|
break;
|
|
case PFIELD_SMOKEFLOW:
|
|
zero_v3(force);
|
|
if (pd->f_source) {
|
|
float density;
|
|
if ((density = smoke_get_velocity_at(pd->f_source, point->loc, force)) >= 0.0f) {
|
|
float influence = strength * efd->falloff;
|
|
if (pd->flag & PFIELD_SMOKE_DENSITY)
|
|
influence *= density;
|
|
mul_v3_fl(force, influence);
|
|
/* apply flow */
|
|
madd_v3_v3fl(total_force, point->vel, -pd->f_flow * influence);
|
|
}
|
|
}
|
|
break;
|
|
|
|
}
|
|
|
|
if (pd->flag & PFIELD_DO_LOCATION) {
|
|
madd_v3_v3fl(total_force, force, 1.0f/point->vel_to_sec);
|
|
|
|
if (ELEM(pd->forcefield, PFIELD_HARMONIC, PFIELD_DRAG, PFIELD_SMOKEFLOW)==0 && pd->f_flow != 0.0f) {
|
|
madd_v3_v3fl(total_force, point->vel, -pd->f_flow * efd->falloff);
|
|
}
|
|
}
|
|
|
|
if (point->ave)
|
|
zero_v3(point->ave);
|
|
if (pd->flag & PFIELD_DO_ROTATION && point->ave && point->rot) {
|
|
float xvec[3] = {1.0f, 0.0f, 0.0f};
|
|
float dave[3];
|
|
mul_qt_v3(point->rot, xvec);
|
|
cross_v3_v3v3(dave, xvec, force);
|
|
if (pd->f_flow != 0.0f) {
|
|
madd_v3_v3fl(dave, point->ave, -pd->f_flow * efd->falloff);
|
|
}
|
|
add_v3_v3(point->ave, dave);
|
|
}
|
|
}
|
|
|
|
/* -------- pdDoEffectors() --------
|
|
* generic force/speed system, now used for particles and softbodies
|
|
* scene = scene where it runs in, for time and stuff
|
|
* lb = listbase with objects that take part in effecting
|
|
* opco = global coord, as input
|
|
* force = force accumulator
|
|
* speed = actual current speed which can be altered
|
|
* cur_time = "external" time in frames, is constant for static particles
|
|
* loc_time = "local" time in frames, range <0-1> for the lifetime of particle
|
|
* par_layer = layer the caller is in
|
|
* flags = only used for softbody wind now
|
|
* guide = old speed of particle
|
|
*/
|
|
void pdDoEffectors(ListBase *effectors, ListBase *colliders, EffectorWeights *weights, EffectedPoint *point, float *force, float *impulse)
|
|
{
|
|
/*
|
|
* Modifies the force on a particle according to its
|
|
* relation with the effector object
|
|
* Different kind of effectors include:
|
|
* Forcefields: Gravity-like attractor
|
|
* (force power is related to the inverse of distance to the power of a falloff value)
|
|
* Vortex fields: swirling effectors
|
|
* (particles rotate around Z-axis of the object. otherwise, same relation as)
|
|
* (Forcefields, but this is not done through a force/acceleration)
|
|
* Guide: particles on a path
|
|
* (particles are guided along a curve bezier or old nurbs)
|
|
* (is independent of other effectors)
|
|
*/
|
|
EffectorCache *eff;
|
|
EffectorData efd;
|
|
int p=0, tot = 1, step = 1;
|
|
|
|
/* Cycle through collected objects, get total of (1/(gravity_strength * dist^gravity_power)) */
|
|
/* Check for min distance here? (yes would be cool to add that, ton) */
|
|
|
|
if (effectors) for (eff = effectors->first; eff; eff=eff->next) {
|
|
/* object effectors were fully checked to be OK to evaluate! */
|
|
|
|
get_effector_tot(eff, &efd, point, &tot, &p, &step);
|
|
|
|
for (; p<tot; p+=step) {
|
|
if (get_effector_data(eff, &efd, point, 0)) {
|
|
efd.falloff= effector_falloff(eff, &efd, point, weights);
|
|
|
|
if (efd.falloff > 0.0f)
|
|
efd.falloff *= eff_calc_visibility(colliders, eff, &efd, point);
|
|
|
|
if (efd.falloff <= 0.0f) {
|
|
/* don't do anything */
|
|
}
|
|
else if (eff->pd->forcefield == PFIELD_TEXTURE) {
|
|
do_texture_effector(eff, &efd, point, force);
|
|
}
|
|
else {
|
|
float temp1[3] = {0, 0, 0}, temp2[3];
|
|
copy_v3_v3(temp1, force);
|
|
|
|
do_physical_effector(eff, &efd, point, force);
|
|
|
|
/* for softbody backward compatibility */
|
|
if (point->flag & PE_WIND_AS_SPEED && impulse) {
|
|
sub_v3_v3v3(temp2, force, temp1);
|
|
sub_v3_v3v3(impulse, impulse, temp2);
|
|
}
|
|
}
|
|
}
|
|
else if (eff->flag & PE_VELOCITY_TO_IMPULSE && impulse) {
|
|
/* special case for harmonic effector */
|
|
add_v3_v3v3(impulse, impulse, efd.vel);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ======== Simulation Debugging ======== */
|
|
|
|
SimDebugData *_sim_debug_data = NULL;
|
|
|
|
unsigned int BKE_sim_debug_data_hash(int i)
|
|
{
|
|
return BLI_ghashutil_uinthash((unsigned int)i);
|
|
}
|
|
|
|
unsigned int BKE_sim_debug_data_hash_combine(unsigned int kx, unsigned int ky)
|
|
{
|
|
#define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
|
|
|
|
unsigned int a, b, c;
|
|
|
|
a = b = c = 0xdeadbeef + (2 << 2) + 13;
|
|
a += kx;
|
|
b += ky;
|
|
|
|
c ^= b; c -= rot(b,14);
|
|
a ^= c; a -= rot(c,11);
|
|
b ^= a; b -= rot(a,25);
|
|
c ^= b; c -= rot(b,16);
|
|
a ^= c; a -= rot(c,4);
|
|
b ^= a; b -= rot(a,14);
|
|
c ^= b; c -= rot(b,24);
|
|
|
|
return c;
|
|
|
|
#undef rot
|
|
}
|
|
|
|
static unsigned int debug_element_hash(const void *key)
|
|
{
|
|
const SimDebugElement *elem = key;
|
|
return elem->hash;
|
|
}
|
|
|
|
static bool debug_element_compare(const void *a, const void *b)
|
|
{
|
|
const SimDebugElement *elem1 = a;
|
|
const SimDebugElement *elem2 = b;
|
|
|
|
if (elem1->hash == elem2->hash) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void debug_element_free(void *val)
|
|
{
|
|
SimDebugElement *elem = val;
|
|
MEM_freeN(elem);
|
|
}
|
|
|
|
void BKE_sim_debug_data_set_enabled(bool enable)
|
|
{
|
|
if (enable) {
|
|
if (!_sim_debug_data) {
|
|
_sim_debug_data = MEM_callocN(sizeof(SimDebugData), "sim debug data");
|
|
_sim_debug_data->gh = BLI_ghash_new(debug_element_hash, debug_element_compare, "sim debug element hash");
|
|
}
|
|
}
|
|
else {
|
|
BKE_sim_debug_data_free();
|
|
}
|
|
}
|
|
|
|
bool BKE_sim_debug_data_get_enabled(void)
|
|
{
|
|
return _sim_debug_data != NULL;
|
|
}
|
|
|
|
void BKE_sim_debug_data_free(void)
|
|
{
|
|
if (_sim_debug_data) {
|
|
if (_sim_debug_data->gh)
|
|
BLI_ghash_free(_sim_debug_data->gh, NULL, debug_element_free);
|
|
MEM_freeN(_sim_debug_data);
|
|
}
|
|
}
|
|
|
|
static void debug_data_insert(SimDebugData *debug_data, SimDebugElement *elem)
|
|
{
|
|
SimDebugElement *old_elem = BLI_ghash_lookup(debug_data->gh, elem);
|
|
if (old_elem) {
|
|
*old_elem = *elem;
|
|
MEM_freeN(elem);
|
|
}
|
|
else
|
|
BLI_ghash_insert(debug_data->gh, elem, elem);
|
|
}
|
|
|
|
void BKE_sim_debug_data_add_element(int type, const float v1[3], const float v2[3], const char *str, float r, float g, float b, const char *category, unsigned int hash)
|
|
{
|
|
unsigned int category_hash = BLI_ghashutil_strhash_p(category);
|
|
SimDebugElement *elem;
|
|
|
|
if (!_sim_debug_data) {
|
|
if (G.debug & G_DEBUG_SIMDATA)
|
|
BKE_sim_debug_data_set_enabled(true);
|
|
else
|
|
return;
|
|
}
|
|
|
|
elem = MEM_callocN(sizeof(SimDebugElement), "sim debug data element");
|
|
elem->type = type;
|
|
elem->category_hash = category_hash;
|
|
elem->hash = hash;
|
|
elem->color[0] = r;
|
|
elem->color[1] = g;
|
|
elem->color[2] = b;
|
|
if (v1)
|
|
copy_v3_v3(elem->v1, v1);
|
|
else
|
|
zero_v3(elem->v1);
|
|
if (v2)
|
|
copy_v3_v3(elem->v2, v2);
|
|
else
|
|
zero_v3(elem->v2);
|
|
if (str)
|
|
BLI_strncpy(elem->str, str, sizeof(elem->str));
|
|
else
|
|
elem->str[0] = '\0';
|
|
|
|
debug_data_insert(_sim_debug_data, elem);
|
|
}
|
|
|
|
void BKE_sim_debug_data_remove_element(unsigned int hash)
|
|
{
|
|
SimDebugElement dummy;
|
|
if (!_sim_debug_data)
|
|
return;
|
|
|
|
dummy.hash = hash;
|
|
BLI_ghash_remove(_sim_debug_data->gh, &dummy, NULL, debug_element_free);
|
|
}
|
|
|
|
void BKE_sim_debug_data_clear(void)
|
|
{
|
|
if (!_sim_debug_data)
|
|
return;
|
|
|
|
if (_sim_debug_data->gh)
|
|
BLI_ghash_clear(_sim_debug_data->gh, NULL, debug_element_free);
|
|
}
|
|
|
|
void BKE_sim_debug_data_clear_category(const char *category)
|
|
{
|
|
int category_hash = (int)BLI_ghashutil_strhash_p(category);
|
|
|
|
if (!_sim_debug_data)
|
|
return;
|
|
|
|
if (_sim_debug_data->gh) {
|
|
GHashIterator iter;
|
|
BLI_ghashIterator_init(&iter, _sim_debug_data->gh);
|
|
while (!BLI_ghashIterator_done(&iter)) {
|
|
const SimDebugElement *elem = BLI_ghashIterator_getValue(&iter);
|
|
BLI_ghashIterator_step(&iter); /* removing invalidates the current iterator, so step before removing */
|
|
|
|
if (elem->category_hash == category_hash)
|
|
BLI_ghash_remove(_sim_debug_data->gh, elem, NULL, debug_element_free);
|
|
}
|
|
}
|
|
}
|