source/blender/blenkernel/intern/effect.c

   1 /*  effect.c
   2  *
   3  *
   4  * $Id$
   5  *
   6  * ***** BEGIN GPL LICENSE BLOCK *****
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  *
  22  * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
  23  * All rights reserved.
  24  *
  25  * The Original Code is: all of this file.
  26  *
  27  * Contributor(s): none yet.
  28  *
  29  * ***** END GPL LICENSE BLOCK *****
  30  */
  31
  32 #include <stddef.h>
  33 #include "BLI_storage.h" /* _LARGEFILE_SOURCE */
  34
  35 #include <math.h>
  36 #include <stdlib.h>
  37
  38 #include "MEM_guardedalloc.h"
  39
  40 #include "DNA_curve_types.h"
  41 #include "DNA_effect_types.h"
  42 #include "DNA_group_types.h"
  43 #include "DNA_ipo_types.h"
  44 #include "DNA_key_types.h"
  45 #include "DNA_lattice_types.h"
  46 #include "DNA_listBase.h"
  47 #include "DNA_mesh_types.h"
  48 #include "DNA_meshdata_types.h"
  49 #include "DNA_material_types.h"
  50 #include "DNA_object_types.h"
  51 #include "DNA_object_force.h"
  52 #include "DNA_particle_types.h"
  53 #include "DNA_texture_types.h"
  54 #include "DNA_scene_types.h"
  55
  56 #include "BLI_math.h"
  57 #include "BLI_blenlib.h"
  58 #include "BLI_jitter.h"
  59 #include "BLI_listbase.h"
  60 #include "BLI_noise.h"
  61 #include "BLI_rand.h"
  62
  63 #include "PIL_time.h"
  64
  65 #include "BKE_action.h"
  66 #include "BKE_anim.h"           /* needed for where_on_path */
  67 #include "BKE_armature.h"
  68 #include "BKE_blender.h"
  69 #include "BKE_collision.h"
  70 #include "BKE_constraint.h"
  71 #include "BKE_deform.h"
  72 #include "BKE_depsgraph.h"
  73 #include "BKE_displist.h"
  74 #include "BKE_DerivedMesh.h"
  75 #include "BKE_cdderivedmesh.h"
  76 #include "BKE_effect.h"
  77 #include "BKE_global.h"
  78 #include "BKE_group.h"
  79 #include "BKE_ipo.h"
  80 #include "BKE_key.h"
  81 #include "BKE_lattice.h"
  82 #include "BKE_mesh.h"
  83 #include "BKE_material.h"
  84 #include "BKE_main.h"
  85 #include "BKE_modifier.h"
  86 #include "BKE_object.h"
  87 #include "BKE_particle.h"
  88 #include "BKE_scene.h"
  89 #include "BKE_utildefines.h"
  90
  91 #include "RE_render_ext.h"
  92 #include "RE_shader_ext.h"
  93
  94 /* fluid sim particle import */
  95 #ifndef DISABLE_ELBEEM
  96 #include "DNA_object_fluidsim.h"
  97 #include "LBM_fluidsim.h"
  98 #include <zlib.h>
  99 #include <string.h>
 100 #endif // DISABLE_ELBEEM
 101
 102 //XXX #include "BIF_screen.h"
 103
 104 EffectorWeights *BKE_add_effector_weights(Group *group)
 105 {
 106         EffectorWeights *weights = MEM_callocN(sizeof(EffectorWeights), "EffectorWeights");
 107         int i;
 108
 109         for(i=0; i<NUM_PFIELD_TYPES; i++)
 110                 weights->weight[i] = 1.0f;
 111
 112         weights->global_gravity = 1.0f;
 113
 114         weights->group = group;
 115
 116         return weights;
 117 }
 118 PartDeflect *object_add_collision_fields(int type)
 119 {
 120         PartDeflect *pd;
 121
 122         pd= MEM_callocN(sizeof(PartDeflect), "PartDeflect");
 123
 124         pd->forcefield = type;
 125         pd->pdef_sbdamp = 0.1f;
 126         pd->pdef_sbift  = 0.2f;
 127         pd->pdef_sboft  = 0.02f;
 128         pd->seed = ((unsigned int)(ceil(PIL_check_seconds_timer()))+1) % 128;
 129         pd->f_strength = 1.0f;
 130         pd->f_damp = 1.0f;
 131
 132         /* set sensible defaults based on type */
 133         switch(type) {
 134                 case PFIELD_VORTEX:
 135                         pd->shape = PFIELD_SHAPE_PLANE;
 136                         break;
 137                 case PFIELD_WIND:
 138                         pd->shape = PFIELD_SHAPE_PLANE;
 139                         pd->f_flow = 1.0f; /* realistic wind behavior */
 140                         break;
 141                 case PFIELD_TEXTURE:
 142                         pd->f_size = 1.0f;
 143                         break;
 144         }
 145         pd->flag = PFIELD_DO_LOCATION|PFIELD_DO_ROTATION;
 146
 147         return pd;
 148 }
 149
 150 /* temporal struct, used for reading return of mesh_get_mapped_verts_nors() */
 151
 152 typedef struct VeNoCo {
 153         float co[3], no[3];
 154 } VeNoCo;
 155
 156 /* ***************** PARTICLES ***************** */
 157
 158 /* deprecated, only keep this for readfile.c */
 159 PartEff *give_parteff(Object *ob)
 160 {
 161         PartEff *paf;
 162
 163         paf= ob->effect.first;
 164         while(paf) {
 165                 if(paf->type==EFF_PARTICLE) return paf;
 166                 paf= paf->next;
 167         }
 168         return 0;
 169 }
 170
 171 void free_effect(Effect *eff)
 172 {
 173         PartEff *paf;
 174
 175         if(eff->type==EFF_PARTICLE) {
 176                 paf= (PartEff *)eff;
 177                 if(paf->keys) MEM_freeN(paf->keys);
 178         }
 179         MEM_freeN(eff);
 180 }
 181
 182
 183 void free_effects(ListBase *lb)
 184 {
 185         Effect *eff;
 186
 187         eff= lb->first;
 188         while(eff) {
 189                 BLI_remlink(lb, eff);
 190                 free_effect(eff);
 191                 eff= lb->first;
 192         }
 193 }
 194
 195 /* -------------------------- Effectors ------------------ */
 196 void free_partdeflect(PartDeflect *pd)
 197 {
 198         if(!pd)
 199                 return;
 200
 201         if(pd->tex)
 202                 pd->tex->id.us--;
 203
 204         if(pd->rng)
 205                 rng_free(pd->rng);
 206
 207         MEM_freeN(pd);
 208 }
 209
 210 static void precalculate_effector(EffectorCache *eff)
 211 {
 212         unsigned int cfra = (unsigned int)(eff->scene->r.cfra >= 0 ? eff->scene->r.cfra : -eff->scene->r.cfra);
 213         if(!eff->pd->rng)
 214                 eff->pd->rng = rng_new(eff->pd->seed + cfra);
 215         else
 216                 rng_srandom(eff->pd->rng, eff->pd->seed + cfra);
 217
 218         if(eff->pd->forcefield == PFIELD_GUIDE && eff->ob->type==OB_CURVE) {
 219                 Curve *cu= eff->ob->data;
 220                 if(cu->flag & CU_PATH) {
 221                         if(cu->path==NULL || cu->path->data==NULL)
 222                                 makeDispListCurveTypes(eff->scene, eff->ob, 0);
 223
 224                         if(cu->path && cu->path->data) {
 225                                 where_on_path(eff->ob, 0.0, eff->guide_loc, eff->guide_dir, NULL, &eff->guide_radius, NULL);
 226                                 mul_m4_v3(eff->ob->obmat, eff->guide_loc);
 227                                 mul_mat3_m4_v3(eff->ob->obmat, eff->guide_dir);
 228                         }
 229                 }
 230         }
 231         else if(eff->pd->shape == PFIELD_SHAPE_SURFACE) {
 232                 eff->surmd = (SurfaceModifierData *)modifiers_findByType ( eff->ob, eModifierType_Surface );
 233                 if(eff->ob->type == OB_CURVE)
 234                         eff->flag |= PE_USE_NORMAL_DATA;
 235         }
 236         else if(eff->psys)
 237                 psys_update_particle_tree(eff->psys, eff->scene->r.cfra);
 238 }
 239 static EffectorCache *new_effector_cache(Scene *scene, Object *ob, ParticleSystem *psys, PartDeflect *pd)
 240 {
 241         EffectorCache *eff = MEM_callocN(sizeof(EffectorCache), "EffectorCache");
 242         eff->scene = scene;
 243         eff->ob = ob;
 244         eff->psys = psys;
 245         eff->pd = pd;
 246         eff->frame = -1;
 247
 248         precalculate_effector(eff);
 249
 250         return eff;
 251 }
 252 static void add_object_to_effectors(ListBase **effectors, Scene *scene, EffectorWeights *weights, Object *ob, Object *ob_src)
 253 {
 254         EffectorCache *eff = NULL;
 255
 256         if( ob == ob_src || weights->weight[ob->pd->forcefield] == 0.0f )
 257                 return;
 258
 259         if (ob->pd->shape == PFIELD_SHAPE_POINTS && !ob->derivedFinal )
 260                 return;
 261
 262         if(*effectors == NULL)
 263                 *effectors = MEM_callocN(sizeof(ListBase), "effectors list");
 264
 265         eff = new_effector_cache(scene, ob, NULL, ob->pd);
 266
 267         /* make sure imat is up to date */
 268         invert_m4_m4(ob->imat, ob->obmat);
 269
 270         BLI_addtail(*effectors, eff);
 271 }
 272 static void add_particles_to_effectors(ListBase **effectors, Scene *scene, EffectorWeights *weights, Object *ob, ParticleSystem *psys, ParticleSystem *psys_src)
 273 {
 274         ParticleSettings *part= psys->part;
 275
 276         if( !psys_check_enabled(ob, psys) )
 277                 return;
 278
 279         if( psys == psys_src && (part->flag & PART_SELF_EFFECT) == 0)
 280                 return;
 281
 282         if( part->pd && part->pd->forcefield && weights->weight[part->pd->forcefield] != 0.0f) {
 283                 if(*effectors == NULL)
 284                         *effectors = MEM_callocN(sizeof(ListBase), "effectors list");
 285
 286                 BLI_addtail(*effectors, new_effector_cache(scene, ob, psys, part->pd));
 287         }
 288
 289         if (part->pd2 && part->pd2->forcefield && weights->weight[part->pd2->forcefield] != 0.0f) {
 290                 if(*effectors == NULL)
 291                         *effectors = MEM_callocN(sizeof(ListBase), "effectors list");
 292
 293                 BLI_addtail(*effectors, new_effector_cache(scene, ob, psys, part->pd2));
 294         }
 295 }
 296
 297 /* returns ListBase handle with objects taking part in the effecting */
 298 ListBase *pdInitEffectors(Scene *scene, Object *ob_src, ParticleSystem *psys_src, EffectorWeights *weights)
 299 {
 300         Base *base;
 301         unsigned int layer= ob_src->lay;
 302         ListBase *effectors = NULL;
 303
 304         if(weights->group) {
 305                 GroupObject *go;
 306
 307                 for(go= weights->group->gobject.first; go; go= go->next) {
 308                         if( (go->ob->lay & layer) ) {
 309                                 if( go->ob->pd && go->ob->pd->forcefield )
 310                                         add_object_to_effectors(&effectors, scene, weights, go->ob, ob_src);
 311
 312                                 if( go->ob->particlesystem.first ) {
 313                                         ParticleSystem *psys= go->ob->particlesystem.first;
 314
 315                                         for( ; psys; psys=psys->next )
 316                                                 add_particles_to_effectors(&effectors, scene, weights, go->ob, psys, psys_src);
 317                                 }
 318                         }
 319                 }
 320         }
 321         else {
 322                 for(base = scene->base.first; base; base= base->next) {
 323                         if( (base->lay & layer) ) {
 324                                 if( base->object->pd && base->object->pd->forcefield )
 325                                 add_object_to_effectors(&effectors, scene, weights, base->object, ob_src);
 326
 327                                 if( base->object->particlesystem.first ) {
 328                                         ParticleSystem *psys= base->object->particlesystem.first;
 329
 330                                         for( ; psys; psys=psys->next )
 331                                                 add_particles_to_effectors(&effectors, scene, weights, base->object, psys, psys_src);
 332                                 }
 333                         }
 334                 }
 335         }
 336         return effectors;
 337 }
 338
 339 void pdEndEffectors(ListBase **effectors)
 340 {
 341         if(*effectors) {
 342                 EffectorCache *eff = (*effectors)->first;
 343
 344                 for(; eff; eff=eff->next) {
 345                         if(eff->guide_data)
 346                                 MEM_freeN(eff->guide_data);
 347                 }
 348
 349                 BLI_freelistN(*effectors);
 350                 MEM_freeN(*effectors);
 351                 *effectors = NULL;
 352         }
 353 }
 354
 355
 356 void pd_point_from_particle(ParticleSimulationData *sim, ParticleData *pa, ParticleKey *state, EffectedPoint *point)
 357 {
 358         point->loc = state->co;
 359         point->vel = state->vel;
 360         point->index = pa - sim->psys->particles;
 361         point->size = pa->size;
 362         /* TODO: point->charge */
 363         point->charge = 1.0f;
 364
 365         point->vel_to_sec = 1.0f;
 366         point->vel_to_frame = psys_get_timestep(sim);
 367
 368         point->flag = 0;
 369
 370         if(sim->psys->part->flag & PART_ROT_DYN) {
 371                 point->ave = state->ave;
 372                 point->rot = state->rot;
 373         }
 374         else
 375                 point->ave = point->rot = NULL;
 376
 377         point->psys = sim->psys;
 378 }
 379
 380 void pd_point_from_loc(Scene *scene, float *loc, float *vel, int index, EffectedPoint *point)
 381 {
 382         point->loc = loc;
 383         point->vel = vel;
 384         point->index = index;
 385         point->size = 0.0f;
 386
 387         point->vel_to_sec = (float)scene->r.frs_sec;
 388         point->vel_to_frame = 1.0f;
 389
 390         point->flag = 0;
 391
 392         point->ave = point->rot = NULL;
 393         point->psys = NULL;
 394 }
 395 void pd_point_from_soft(Scene *scene, float *loc, float *vel, int index, EffectedPoint *point)
 396 {
 397         point->loc = loc;
 398         point->vel = vel;
 399         point->index = index;
 400         point->size = 0.0f;
 401
 402         point->vel_to_sec = (float)scene->r.frs_sec;
 403         point->vel_to_frame = 1.0f;
 404
 405         point->flag = PE_WIND_AS_SPEED;
 406
 407         point->ave = point->rot = NULL;
 408
 409         point->psys = NULL;
 410 }
 411 /************************************************/
 412 /*                      Effectors               */
 413 /************************************************/
 414
 415 // triangle - ray callback function
 416 static void eff_tri_ray_hit(void *UNUSED(userData), int UNUSED(index), const BVHTreeRay *UNUSED(ray), BVHTreeRayHit *hit)
 417 {
 418         // whenever we hit a bounding box, we don't check further
 419         hit->dist = -1;
 420         hit->index = 1;
 421 }
 422
 423 // get visibility of a wind ray
 424 static float eff_calc_visibility(ListBase *colliders, EffectorCache *eff, EffectorData *efd, EffectedPoint *point)
 425 {
 426         ListBase *colls = colliders;
 427         ColliderCache *col;
 428         float norm[3], len = 0.0;
 429         float visibility = 1.0, absorption = 0.0;
 430
 431         if(!(eff->pd->flag & PFIELD_VISIBILITY))
 432                 return visibility;
 433
 434         if(!colls)
 435                 colls = get_collider_cache(eff->scene, NULL, NULL);
 436
 437         if(!colls)
 438                 return visibility;
 439
 440         negate_v3_v3(norm, efd->vec_to_point);
 441         len = normalize_v3(norm);
 442
 443         // check all collision objects
 444         for(col = colls->first; col; col = col->next)
 445         {
 446                 CollisionModifierData *collmd = col->collmd;
 447
 448                 if(col->ob == eff->ob)
 449                         continue;
 450
 451                 if(collmd->bvhtree)
 452                 {
 453                         BVHTreeRayHit hit;
 454
 455                         hit.index = -1;
 456                         hit.dist = len + FLT_EPSILON;
 457
 458                         // check if the way is blocked
 459                         if(BLI_bvhtree_ray_cast(collmd->bvhtree, point->loc, norm, 0.0f, &hit, eff_tri_ray_hit, NULL)>=0)
 460                         {
 461                                 absorption= col->ob->pd->absorption;
 462
 463                                 // visibility is only between 0 and 1, calculated from 1-absorption
 464                                 visibility *= CLAMPIS(1.0f-absorption, 0.0f, 1.0f);
 465
 466                                 if(visibility <= 0.0f)
 467                                         break;
 468                         }
 469                 }
 470         }
 471
 472         if(!colliders)
 473                 free_collider_cache(&colls);
 474
 475         return visibility;
 476 }
 477
 478 // noise function for wind e.g.
 479 static float wind_func(struct RNG *rng, float strength)
 480 {
 481         int random = (rng_getInt(rng)+1) % 128; // max 2357
 482         float force = rng_getFloat(rng) + 1.0f;
 483         float ret;
 484         float sign = 0;
 485
 486         sign = ((float)random > 64.0) ? 1.0: -1.0; // dividing by 2 is not giving equal sign distribution
 487
 488         ret = sign*((float)random / force)*strength/128.0f;
 489
 490         return ret;
 491 }
 492
 493 /* maxdist: zero effect from this distance outwards (if usemax) */
 494 /* mindist: full effect up to this distance (if usemin) */
 495 /* power: falloff with formula 1/r^power */
 496 static float falloff_func(float fac, int usemin, float mindist, int usemax, float maxdist, float power)
 497 {
 498         /* first quick checks */
 499         if(usemax && fac > maxdist)
 500                 return 0.0f;
 501
 502         if(usemin && fac < mindist)
 503                 return 1.0f;
 504
 505         if(!usemin)
 506                 mindist = 0.0;
 507
 508         return pow((double)1.0+fac-mindist, (double)-power);
 509 }
 510
 511 static float falloff_func_dist(PartDeflect *pd, float fac)
 512 {
 513         return falloff_func(fac, pd->flag&PFIELD_USEMIN, pd->mindist, pd->flag&PFIELD_USEMAX, pd->maxdist, pd->f_power);
 514 }
 515
 516 static float falloff_func_rad(PartDeflect *pd, float fac)
 517 {
 518         return falloff_func(fac, pd->flag&PFIELD_USEMINR, pd->minrad, pd->flag&PFIELD_USEMAXR, pd->maxrad, pd->f_power_r);
 519 }
 520
 521 float effector_falloff(EffectorCache *eff, EffectorData *efd, EffectedPoint *UNUSED(point), EffectorWeights *weights)
 522 {
 523         float temp[3];
 524         float falloff = weights ? weights->weight[0] * weights->weight[eff->pd->forcefield] : 1.0f;
 525         float fac, r_fac;
 526
 527         fac = dot_v3v3(efd->nor, efd->vec_to_point2);
 528
 529         if(eff->pd->zdir == PFIELD_Z_POS && fac < 0.0f)
 530                 falloff=0.0f;
 531         else if(eff->pd->zdir == PFIELD_Z_NEG && fac > 0.0f)
 532                 falloff=0.0f;
 533         else switch(eff->pd->falloff){
 534                 case PFIELD_FALL_SPHERE:
 535                         falloff*= falloff_func_dist(eff->pd, efd->distance);
 536                         break;
 537
 538                 case PFIELD_FALL_TUBE:
 539                         falloff*= falloff_func_dist(eff->pd, ABS(fac));
 540                         if(falloff == 0.0f)
 541                                 break;
 542
 543                         VECADDFAC(temp, efd->vec_to_point, efd->nor, -fac);
 544                         r_fac= len_v3(temp);
 545                         falloff*= falloff_func_rad(eff->pd, r_fac);
 546                         break;
 547                 case PFIELD_FALL_CONE:
 548                         falloff*= falloff_func_dist(eff->pd, ABS(fac));
 549                         if(falloff == 0.0f)
 550                                 break;
 551
 552                         r_fac=saacos(fac/len_v3(efd->vec_to_point))*180.0f/(float)M_PI;
 553                         falloff*= falloff_func_rad(eff->pd, r_fac);
 554
 555                         break;
 556         }
 557
 558         return falloff;
 559 }
 560
 561 int closest_point_on_surface(SurfaceModifierData *surmd, float *co, float *surface_co, float *surface_nor, float *surface_vel)
 562 {
 563         BVHTreeNearest nearest;
 564
 565         nearest.index = -1;
 566         nearest.dist = FLT_MAX;
 567
 568         BLI_bvhtree_find_nearest(surmd->bvhtree->tree, co, &nearest, surmd->bvhtree->nearest_callback, surmd->bvhtree);
 569
 570         if(nearest.index != -1) {
 571                 VECCOPY(surface_co, nearest.co);
 572
 573                 if(surface_nor) {
 574                         VECCOPY(surface_nor, nearest.no);
 575                 }
 576
 577                 if(surface_vel) {
 578                         MFace *mface = CDDM_get_face(surmd->dm, nearest.index);
 579
 580                         VECCOPY(surface_vel, surmd->v[mface->v1].co);
 581                         add_v3_v3(surface_vel, surmd->v[mface->v2].co);
 582                         add_v3_v3(surface_vel, surmd->v[mface->v3].co);
 583                         if(mface->v4)
 584                                 add_v3_v3(surface_vel, surmd->v[mface->v4].co);
 585
 586                         mul_v3_fl(surface_vel, mface->v4 ? 0.25f : 0.333f);
 587                 }
 588                 return 1;
 589         }
 590
 591         return 0;
 592 }
 593 int get_effector_data(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, int real_velocity)
 594 {
 595         float cfra = eff->scene->r.cfra;
 596         int ret = 0;
 597
 598         if(eff->pd && eff->pd->shape==PFIELD_SHAPE_SURFACE && eff->surmd) {
 599                 /* closest point in the object surface is an effector */
 600                 float vec[3];
 601
 602                 /* using velocity corrected location allows for easier sliding over effector surface */
 603                 copy_v3_v3(vec, point->vel);
 604                 mul_v3_fl(vec, point->vel_to_frame);
 605                 add_v3_v3(vec, point->loc);
 606
 607                 ret = closest_point_on_surface(eff->surmd, vec, efd->loc, efd->nor, real_velocity ? efd->vel : NULL);
 608
 609                 efd->size = 0.0f;
 610         }
 611         else if(eff->pd && eff->pd->shape==PFIELD_SHAPE_POINTS) {
 612
 613                 if(eff->ob->derivedFinal) {
 614                         DerivedMesh *dm = eff->ob->derivedFinal;
 615
 616                         dm->getVertCo(dm, *efd->index, efd->loc);
 617                         dm->getVertNo(dm, *efd->index, efd->nor);
 618
 619                         mul_m4_v3(eff->ob->obmat, efd->loc);
 620                         mul_mat3_m4_v3(eff->ob->obmat, efd->nor);
 621
 622                         normalize_v3(efd->nor);
 623
 624                         efd->size = 0.0f;
 625
 626                         /**/
 627                         ret = 1;
 628                 }
 629         }
 630         else if(eff->psys) {
 631                 ParticleSimulationData sim = {eff->scene, eff->ob, eff->psys, NULL, NULL};
 632                 ParticleData *pa = eff->psys->particles + *efd->index;
 633                 ParticleKey state;
 634
 635                 /* exclude the particle itself for self effecting particles */
 636                 if(eff->psys == point->psys && *efd->index == point->index)
 637                         ;
 638                 else {
 639                         /* TODO: time from actual previous calculated frame (step might not be 1) */
 640                         state.time = cfra - 1.0;
 641                         ret = psys_get_particle_state(&sim, *efd->index, &state, 0);
 642
 643                         /* TODO */
 644                         //if(eff->pd->forcefiled == PFIELD_HARMONIC && ret==0) {
 645                         //      if(pa->dietime < eff->psys->cfra)
 646                         //              eff->flag |= PE_VELOCITY_TO_IMPULSE;
 647                         //}
 648
 649                         VECCOPY(efd->loc, state.co);
 650                         VECCOPY(efd->nor, state.vel);
 651                         if(real_velocity) {
 652                                 VECCOPY(efd->vel, state.vel);
 653                         }
 654
 655                         efd->size = pa->size;
 656                 }
 657         }
 658         else {
 659                 /* use center of object for distance calculus */
 660                 Object *ob = eff->ob;
 661                 Object obcopy = *ob;
 662
 663                 /* XXX this is not thread-safe, but used from multiple threads by
 664                    particle system */
 665                 where_is_object_time(eff->scene, ob, cfra);
 666
 667                 /* use z-axis as normal*/
 668                 normalize_v3_v3(efd->nor, ob->obmat[2]);
 669
 670                 /* for vortex the shape chooses between old / new force */
 671                 if(eff->pd && eff->pd->shape == PFIELD_SHAPE_PLANE) {
 672                         /* efd->loc is closes point on effector xy-plane */
 673                         float temp[3], translate[3];
 674                         sub_v3_v3v3(temp, point->loc, ob->obmat[3]);
 675                         project_v3_v3v3(translate, temp, efd->nor);
 676                         add_v3_v3v3(efd->loc, ob->obmat[3], translate);
 677                 }
 678                 else {
 679                         VECCOPY(efd->loc, ob->obmat[3]);
 680                 }
 681
 682                 if(real_velocity) {
 683                         VECCOPY(efd->vel, ob->obmat[3]);
 684
 685                         where_is_object_time(eff->scene, ob, cfra - 1.0);
 686
 687                         sub_v3_v3v3(efd->vel, efd->vel, ob->obmat[3]);
 688                 }
 689
 690                 *eff->ob = obcopy;
 691
 692                 efd->size = 0.0f;
 693
 694                 ret = 1;
 695         }
 696
 697         if(ret) {
 698                 sub_v3_v3v3(efd->vec_to_point, point->loc, efd->loc);
 699                 efd->distance = len_v3(efd->vec_to_point);
 700
 701                 /* rest length for harmonic effector, will have to see later if this could be extended to other effectors */
 702                 if(eff->pd && eff->pd->forcefield == PFIELD_HARMONIC && eff->pd->f_size)
 703                         mul_v3_fl(efd->vec_to_point, (efd->distance-eff->pd->f_size)/efd->distance);
 704
 705                 if(eff->flag & PE_USE_NORMAL_DATA) {
 706                         VECCOPY(efd->vec_to_point2, efd->vec_to_point);
 707                         VECCOPY(efd->nor2, efd->nor);
 708                 }
 709                 else {
 710                         /* for some effectors we need the object center every time */
 711                         sub_v3_v3v3(efd->vec_to_point2, point->loc, eff->ob->obmat[3]);
 712                         normalize_v3_v3(efd->nor2, eff->ob->obmat[2]);
 713                 }
 714         }
 715
 716         return ret;
 717 }
 718 static void get_effector_tot(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, int *tot, int *p)
 719 {
 720         if(eff->pd->shape == PFIELD_SHAPE_POINTS) {
 721                 efd->index = p;
 722
 723                 *p = 0;
 724                 *tot = eff->ob->derivedFinal ? eff->ob->derivedFinal->numVertData : 1;
 725
 726                 if(*tot && eff->pd->forcefield == PFIELD_HARMONIC && point->index >= 0) {
 727                         *p = point->index % *tot;
 728                         *tot = *p+1;
 729                 }
 730         }
 731         else if(eff->psys) {
 732                 efd->index = p;
 733
 734                 *p = 0;
 735                 *tot = eff->psys->totpart;
 736
 737                 if(eff->pd->forcefield == PFIELD_CHARGE) {
 738                         /* Only the charge of the effected particle is used for
 739                         interaction, not fall-offs. If the fall-offs aren't the
 740                         same this will be unphysical, but for animation this
 741                         could be the wanted behavior. If you want physical
 742                         correctness the fall-off should be spherical 2.0 anyways.
 743                         */
 744                         efd->charge = eff->pd->f_strength;
 745                 }
 746                 else if(eff->pd->forcefield == PFIELD_HARMONIC && (eff->pd->flag & PFIELD_MULTIPLE_SPRINGS)==0) {
 747                         /* every particle is mapped to only one harmonic effector particle */
 748                         *p= point->index % eff->psys->totpart;
 749                         *tot= *p + 1;
 750                 }
 751         }
 752         else {
 753                 *p = 0;
 754                 *tot = 1;
 755         }
 756 }
 757 static void do_texture_effector(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, float *total_force)
 758 {
 759         TexResult result[4];
 760         float tex_co[3], strength, force[3];
 761         float nabla = eff->pd->tex_nabla;
 762         int hasrgb;
 763         short mode = eff->pd->tex_mode;
 764
 765         if(!eff->pd->tex)
 766                 return;
 767
 768         result[0].nor = result[1].nor = result[2].nor = result[3].nor = 0;
 769
 770         strength= eff->pd->f_strength * efd->falloff;
 771
 772         VECCOPY(tex_co,point->loc);
 773
 774         if(eff->pd->flag & PFIELD_TEX_2D) {
 775                 float fac=-dot_v3v3(tex_co, efd->nor);
 776                 VECADDFAC(tex_co, tex_co, efd->nor, fac);
 777         }
 778
 779         if(eff->pd->flag & PFIELD_TEX_OBJECT) {
 780                 mul_m4_v3(eff->ob->imat, tex_co);
 781         }
 782
 783         hasrgb = multitex_ext(eff->pd->tex, tex_co, NULL,NULL, 0, result);
 784
 785         if(hasrgb && mode==PFIELD_TEX_RGB) {
 786                 force[0] = (0.5f - result->tr) * strength;
 787                 force[1] = (0.5f - result->tg) * strength;
 788                 force[2] = (0.5f - result->tb) * strength;
 789         }
 790         else {
 791                 strength/=nabla;
 792
 793                 tex_co[0] += nabla;
 794                 multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result+1);
 795
 796                 tex_co[0] -= nabla;
 797                 tex_co[1] += nabla;
 798                 multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result+2);
 799
 800                 tex_co[1] -= nabla;
 801                 tex_co[2] += nabla;
 802                 multitex_ext(eff->pd->tex, tex_co, NULL, NULL, 0, result+3);
 803
 804                 if(mode == PFIELD_TEX_GRAD || !hasrgb) { /* if we dont have rgb fall back to grad */
 805                         force[0] = (result[0].tin - result[1].tin) * strength;
 806                         force[1] = (result[0].tin - result[2].tin) * strength;
 807                         force[2] = (result[0].tin - result[3].tin) * strength;
 808                 }
 809                 else { /*PFIELD_TEX_CURL*/
 810                         float dbdy, dgdz, drdz, dbdx, dgdx, drdy;
 811
 812                         dbdy = result[2].tb - result[0].tb;
 813                         dgdz = result[3].tg - result[0].tg;
 814                         drdz = result[3].tr - result[0].tr;
 815                         dbdx = result[1].tb - result[0].tb;
 816                         dgdx = result[1].tg - result[0].tg;
 817                         drdy = result[2].tr - result[0].tr;
 818
 819                         force[0] = (dbdy - dgdz) * strength;
 820                         force[1] = (drdz - dbdx) * strength;
 821                         force[2] = (dgdx - drdy) * strength;
 822                 }
 823         }
 824
 825         if(eff->pd->flag & PFIELD_TEX_2D){
 826                 float fac = -dot_v3v3(force, efd->nor);
 827                 VECADDFAC(force, force, efd->nor, fac);
 828         }
 829
 830         add_v3_v3(total_force, force);
 831 }
 832 void do_physical_effector(EffectorCache *eff, EffectorData *efd, EffectedPoint *point, float *total_force)
 833 {
 834         PartDeflect *pd = eff->pd;
 835         RNG *rng = pd->rng;
 836         float force[3]={0,0,0};
 837         float temp[3];
 838         float fac;
 839         float strength = pd->f_strength;
 840         float damp = pd->f_damp;
 841         float noise_factor = pd->f_noise;
 842
 843         if(noise_factor > 0.0f) {
 844                 strength += wind_func(rng, noise_factor);
 845
 846                 if(ELEM(pd->forcefield, PFIELD_HARMONIC, PFIELD_DRAG))
 847                         damp += wind_func(rng, noise_factor);
 848         }
 849
 850         VECCOPY(force, efd->vec_to_point);
 851
 852         switch(pd->forcefield){
 853                 case PFIELD_WIND:
 854                         VECCOPY(force, efd->nor);
 855                         mul_v3_fl(force, strength * efd->falloff);
 856                         break;
 857                 case PFIELD_FORCE:
 858                         normalize_v3(force);
 859                         mul_v3_fl(force, strength * efd->falloff);
 860                         break;
 861                 case PFIELD_VORTEX:
 862                         /* old vortex force */
 863                         if(pd->shape == PFIELD_SHAPE_POINT) {
 864                                 cross_v3_v3v3(force, efd->nor, efd->vec_to_point);
 865                                 normalize_v3(force);
 866                                 mul_v3_fl(force, strength * efd->distance * efd->falloff);
 867                         }
 868                         else {
 869                                 /* new vortex force */
 870                                 cross_v3_v3v3(temp, efd->nor2, efd->vec_to_point2);
 871                                 mul_v3_fl(temp, strength * efd->falloff);
 872
 873                                 cross_v3_v3v3(force, efd->nor2, temp);
 874                                 mul_v3_fl(force, strength * efd->falloff);
 875
 876                                 VECADDFAC(temp, temp, point->vel, -point->vel_to_sec);
 877                                 add_v3_v3(force, temp);
 878                         }
 879                         break;
 880                 case PFIELD_MAGNET:
 881                         if(eff->pd->shape == PFIELD_SHAPE_POINT)
 882                                 /* magnetic field of a moving charge */
 883                                 cross_v3_v3v3(temp, efd->nor, efd->vec_to_point);
 884                         else
 885                                 copy_v3_v3(temp, efd->nor);
 886
 887                         normalize_v3(temp);
 888                         mul_v3_fl(temp, strength * efd->falloff);
 889                         cross_v3_v3v3(force, point->vel, temp);
 890                         mul_v3_fl(force, point->vel_to_sec);
 891                         break;
 892                 case PFIELD_HARMONIC:
 893                         mul_v3_fl(force, -strength * efd->falloff);
 894                         copy_v3_v3(temp, point->vel);
 895                         mul_v3_fl(temp, -damp * 2.0f * (float)sqrt(fabs(strength)) * point->vel_to_sec);
 896                         add_v3_v3(force, temp);
 897                         break;
 898                 case PFIELD_CHARGE:
 899                         mul_v3_fl(force, point->charge * strength * efd->falloff);
 900                         break;
 901                 case PFIELD_LENNARDJ:
 902                         fac = pow((efd->size + point->size) / efd->distance, 6.0);
 903
 904                         fac = - fac * (1.0 - fac) / efd->distance;
 905
 906                         /* limit the repulsive term drastically to avoid huge forces */
 907                         fac = ((fac>2.0) ? 2.0 : fac);
 908
 909                         mul_v3_fl(force, strength * fac);
 910                         break;
 911                 case PFIELD_BOID:
 912                         /* Boid field is handled completely in boids code. */
 913                         return;
 914                 case PFIELD_TURBULENCE:
 915                         if(pd->flag & PFIELD_GLOBAL_CO) {
 916                                 VECCOPY(temp, point->loc);
 917                         }
 918                         else {
 919                                 VECADD(temp, efd->vec_to_point2, efd->nor2);
 920                         }
 921                         force[0] = -1.0f + 2.0f * BLI_gTurbulence(pd->f_size, temp[0], temp[1], temp[2], 2,0,2);
 922                         force[1] = -1.0f + 2.0f * BLI_gTurbulence(pd->f_size, temp[1], temp[2], temp[0], 2,0,2);
 923                         force[2] = -1.0f + 2.0f * BLI_gTurbulence(pd->f_size, temp[2], temp[0], temp[1], 2,0,2);
 924                         mul_v3_fl(force, strength * efd->falloff);
 925                         break;
 926                 case PFIELD_DRAG:
 927                         VECCOPY(force, point->vel);
 928                         fac = normalize_v3(force) * point->vel_to_sec;
 929
 930                         strength = MIN2(strength, 2.0f);
 931                         damp = MIN2(damp, 2.0f);
 932
 933                         mul_v3_fl(force, -efd->falloff * fac * (strength * fac + damp));
 934                         break;
 935         }
 936
 937         if(pd->flag & PFIELD_DO_LOCATION) {
 938                 VECADDFAC(total_force, total_force, force, 1.0f/point->vel_to_sec);
 939
 940                 if(ELEM(pd->forcefield, PFIELD_HARMONIC, PFIELD_DRAG)==0 && pd->f_flow != 0.0f) {
 941                         VECADDFAC(total_force, total_force, point->vel, -pd->f_flow * efd->falloff);
 942                 }
 943         }
 944
 945         if(pd->flag & PFIELD_DO_ROTATION && point->ave && point->rot) {
 946                 float xvec[3] = {1.0f, 0.0f, 0.0f};
 947                 float dave[3];
 948                 mul_qt_v3(point->rot, xvec);
 949                 cross_v3_v3v3(dave, xvec, force);
 950                 if(pd->f_flow != 0.0f) {
 951                         VECADDFAC(dave, dave, point->ave, -pd->f_flow * efd->falloff);
 952                 }
 953                 add_v3_v3(point->ave, dave);
 954         }
 955 }
 956
 957 /*  -------- pdDoEffectors() --------
 958         generic force/speed system, now used for particles and softbodies
 959         scene       = scene where it runs in, for time and stuff
 960         lb                      = listbase with objects that take part in effecting
 961         opco            = global coord, as input
 962         force           = force accumulator
 963         speed           = actual current speed which can be altered
 964         cur_time        = "external" time in frames, is constant for static particles
 965         loc_time        = "local" time in frames, range <0-1> for the lifetime of particle
 966         par_layer       = layer the caller is in
 967         flags           = only used for softbody wind now
 968         guide           = old speed of particle
 969
 970 */
 971 void pdDoEffectors(ListBase *effectors, ListBase *colliders, EffectorWeights *weights, EffectedPoint *point, float *force, float *impulse)
 972 {
 973 /*
 974         Modifies the force on a particle according to its
 975         relation with the effector object
 976         Different kind of effectors include:
 977                 Forcefields: Gravity-like attractor
 978                 (force power is related to the inverse of distance to the power of a falloff value)
 979                 Vortex fields: swirling effectors
 980                 (particles rotate around Z-axis of the object. otherwise, same relation as)
 981                 (Forcefields, but this is not done through a force/acceleration)
 982                 Guide: particles on a path
 983                 (particles are guided along a curve bezier or old nurbs)
 984                 (is independent of other effectors)
 985 */
 986         EffectorCache *eff;
 987         EffectorData efd;
 988         int p=0, tot = 1;
 989
 990         /* Cycle through collected objects, get total of (1/(gravity_strength * dist^gravity_power)) */
 991         /* Check for min distance here? (yes would be cool to add that, ton) */
 992
 993         if(effectors) for(eff = effectors->first; eff; eff=eff->next) {
 994                 /* object effectors were fully checked to be OK to evaluate! */
 995
 996                 get_effector_tot(eff, &efd, point, &tot, &p);
 997
 998                 for(; p<tot; p++) {
 999                         if(get_effector_data(eff, &efd, point, 0)) {
1000                                 efd.falloff= effector_falloff(eff, &efd, point, weights);
1001
1002                                 if(efd.falloff > 0.0f)
1003                                         efd.falloff *= eff_calc_visibility(colliders, eff, &efd, point);
1004
1005                                 if(efd.falloff <= 0.0f)
1006                                         ;       /* don't do anything */
1007                                 else if(eff->pd->forcefield == PFIELD_TEXTURE)
1008                                         do_texture_effector(eff, &efd, point, force);
1009                                 else {
1010                                         float temp1[3]={0,0,0}, temp2[3];
1011                                         VECCOPY(temp1, force);
1012
1013                                         do_physical_effector(eff, &efd, point, force);
1014
1015                                         // for softbody backward compatibility
1016                                         if(point->flag & PE_WIND_AS_SPEED && impulse){
1017                                                 VECSUB(temp2, force, temp1);
1018                                                 VECSUB(impulse, impulse, temp2);
1019                                         }
1020                                 }
1021                         }
1022                         else if(eff->flag & PE_VELOCITY_TO_IMPULSE && impulse) {
1023                                 /* special case for harmonic effector */
1024                                 VECADD(impulse, impulse, efd.vel);
1025                         }
1026                 }
1027         }
1028 }