/************************************************
* clothModifier_do - main simulation function
************************************************/
void clothModifier_do(ClothModifierData *clmd, Scene *scene, Object *ob, DerivedMesh *dm, float (*vertexCos)[3])
{
PointCache *cache;
PTCacheID pid;
float timescale;
int framenr, startframe, endframe;
int cache_result;
clmd->scene= scene; /* nice to pass on later :) */
framenr= (int)scene->r.cfra;
cache= clmd->point_cache;
BKE_ptcache_id_from_cloth(&pid, ob, clmd);
BKE_ptcache_id_time(&pid, scene, framenr, &startframe, &endframe, ×cale);
clmd->sim_parms->timescale= timescale;
if(clmd->sim_parms->reset
|| (framenr == (startframe - clmd->sim_parms->preroll) && clmd->sim_parms->preroll != 0)
|| (clmd->clothObject && dm->getNumVerts(dm) != clmd->clothObject->numverts))
{
clmd->sim_parms->reset = 0;
cache->flag |= PTCACHE_OUTDATED;
BKE_ptcache_id_reset(scene, &pid, PTCACHE_RESET_OUTDATED);
BKE_ptcache_validate(cache, 0);
cache->last_exact= 0;
cache->flag &= ~PTCACHE_REDO_NEEDED;
return;
}
// unused in the moment, calculated separately in implicit.c
clmd->sim_parms->dt = clmd->sim_parms->timescale / clmd->sim_parms->stepsPerFrame;
/* handle continuous simulation with the play button */
if(BKE_ptcache_get_continue_physics() || ((clmd->sim_parms->preroll > 0) && (framenr > startframe - clmd->sim_parms->preroll) && (framenr < startframe))) {
BKE_ptcache_invalidate(cache);
/* do simulation */
if(!do_init_cloth(ob, clmd, dm, framenr))
return;
do_step_cloth(ob, clmd, dm, framenr);
cloth_to_object(ob, clmd, vertexCos);
clmd->clothObject->last_frame= framenr;
return;
}
/* simulation is only active during a specific period */
if(framenr < startframe) {
BKE_ptcache_invalidate(cache);
return;
}
else if(framenr > endframe) {
framenr= endframe;
}
/* initialize simulation data if it didn't exist already */
if(!do_init_cloth(ob, clmd, dm, framenr))
return;
if((framenr == startframe) && (clmd->sim_parms->preroll == 0)) {
BKE_ptcache_id_reset(scene, &pid, PTCACHE_RESET_OUTDATED);
do_init_cloth(ob, clmd, dm, framenr);
BKE_ptcache_validate(cache, framenr);
cache->flag &= ~PTCACHE_REDO_NEEDED;
clmd->clothObject->last_frame= framenr;
return;
}
/* try to read from cache */
cache_result = BKE_ptcache_read(&pid, (float)framenr+scene->r.subframe);
if(cache_result == PTCACHE_READ_EXACT || cache_result == PTCACHE_READ_INTERPOLATED) {
implicit_set_positions(clmd);
cloth_to_object (ob, clmd, vertexCos);
BKE_ptcache_validate(cache, framenr);
if(cache_result == PTCACHE_READ_INTERPOLATED && cache->flag & PTCACHE_REDO_NEEDED)
BKE_ptcache_write(&pid, framenr);
clmd->clothObject->last_frame= framenr;
return;
}
else if(cache_result==PTCACHE_READ_OLD) {
implicit_set_positions(clmd);
}
else if( /*ob->id.lib ||*/ (cache->flag & PTCACHE_BAKED)) { /* 2.4x disabled lib, but this can be used in some cases, testing further - campbell */
/* if baked and nothing in cache, do nothing */
BKE_ptcache_invalidate(cache);
return;
}
if(framenr!=clmd->clothObject->last_frame+1)
return;
/* if on second frame, write cache for first frame */
if(cache->simframe == startframe && (cache->flag & PTCACHE_OUTDATED || cache->last_exact==0))
BKE_ptcache_write(&pid, startframe);
clmd->sim_parms->timescale *= framenr - cache->simframe;
/* do simulation */
BKE_ptcache_validate(cache, framenr);
if(!do_step_cloth(ob, clmd, dm, framenr)) {
BKE_ptcache_invalidate(cache);
}
else
BKE_ptcache_write(&pid, framenr);
cloth_to_object (ob, clmd, vertexCos);
clmd->clothObject->last_frame= framenr;
}
/************************************************
* clothModifier_do - main simulation function
************************************************/
DerivedMesh *clothModifier_do(ClothModifierData *clmd, Scene *scene, Object *ob, DerivedMesh *dm, int useRenderParams, int isFinalCalc)
{
DerivedMesh *result;
PointCache *cache;
PTCacheID pid;
float timescale;
int framedelta, framenr, startframe, endframe;
int cache_result;
clmd->scene= scene; /* nice to pass on later :) */
framenr= (int)scene->r.cfra;
cache= clmd->point_cache;
result = CDDM_copy(dm);
BKE_ptcache_id_from_cloth(&pid, ob, clmd);
BKE_ptcache_id_time(&pid, scene, framenr, &startframe, &endframe, ×cale);
clmd->sim_parms->timescale= timescale;
if(!result) {
cache->flag &= ~PTCACHE_SIMULATION_VALID;
cache->simframe= 0;
cache->last_exact= 0;
return dm;
}
/* verify we still have the same number of vertices, if not do nothing.
* note that this should only happen if the number of vertices changes
* during an animation due to a preceding modifier, this should not
* happen because of object changes! */
if(clmd->clothObject) {
if(result->getNumVerts(result) != clmd->clothObject->numverts) {
cache->flag &= ~PTCACHE_SIMULATION_VALID;
cache->simframe= 0;
cache->last_exact= 0;
return result;
}
}
// unused in the moment, calculated seperately in implicit.c
clmd->sim_parms->dt = clmd->sim_parms->timescale / clmd->sim_parms->stepsPerFrame;
/* handle continuous simulation with the play button */
if(BKE_ptcache_get_continue_physics()) {
cache->flag &= ~PTCACHE_SIMULATION_VALID;
cache->simframe= 0;
cache->last_exact= 0;
/* do simulation */
if(!do_init_cloth(ob, clmd, result, framenr))
return result;
do_step_cloth(ob, clmd, result, framenr);
cloth_to_object(ob, clmd, result);
return result;
}
/* simulation is only active during a specific period */
if(framenr < startframe) {
cache->flag &= ~PTCACHE_SIMULATION_VALID;
cache->simframe= 0;
cache->last_exact= 0;
return result;
}
else if(framenr > endframe) {
framenr= endframe;
}
if(cache->flag & PTCACHE_SIMULATION_VALID)
framedelta= framenr - cache->simframe;
else
framedelta= -1;
/* initialize simulation data if it didn't exist already */
if(!do_init_cloth(ob, clmd, result, framenr))
return result;
if(framenr == startframe) {
BKE_ptcache_id_reset(scene, &pid, PTCACHE_RESET_OUTDATED);
do_init_cloth(ob, clmd, result, framenr);
cache->simframe= framenr;
cache->flag |= PTCACHE_SIMULATION_VALID;
cache->flag &= ~PTCACHE_REDO_NEEDED;
return result;
}
/* try to read from cache */
cache_result = BKE_ptcache_read_cache(&pid, (float)framenr, scene->r.frs_sec);
if(cache_result == PTCACHE_READ_EXACT || cache_result == PTCACHE_READ_INTERPOLATED) {
implicit_set_positions(clmd);
cloth_to_object (ob, clmd, result);
cache->simframe= framenr;
cache->flag |= PTCACHE_SIMULATION_VALID;
if(cache_result == PTCACHE_READ_INTERPOLATED && cache->flag & PTCACHE_REDO_NEEDED)
BKE_ptcache_write_cache(&pid, framenr);
return result;
}
else if(cache_result==PTCACHE_READ_OLD) {
implicit_set_positions(clmd);
cache->flag |= PTCACHE_SIMULATION_VALID;
}
else if(ob->id.lib || (cache->flag & PTCACHE_BAKED)) {
/* if baked and nothing in cache, do nothing */
cache->flag &= ~PTCACHE_SIMULATION_VALID;
cache->simframe= 0;
cache->last_exact= 0;
return result;
}
/* if on second frame, write cache for first frame */
if(cache->simframe == startframe && (cache->flag & PTCACHE_OUTDATED || cache->last_exact==0))
BKE_ptcache_write_cache(&pid, startframe);
clmd->sim_parms->timescale *= framenr - cache->simframe;
/* do simulation */
cache->flag |= PTCACHE_SIMULATION_VALID;
cache->simframe= framenr;
if(!do_step_cloth(ob, clmd, result, framenr)) {
cache->flag &= ~PTCACHE_SIMULATION_VALID;
cache->simframe= 0;
cache->last_exact= 0;
}
else
BKE_ptcache_write_cache(&pid, framenr);
cloth_to_object (ob, clmd, result);
return result;
}