A bunch of fun stuff now possible because of new pointcache code:

* Baked normal particles can now use the "Path" visualization.
* Path "max length" & "abs length" are now history:
	- New option to set path start & end times + random variation to length.
	- Much more flexible (and calculated better) than previous options.
	- This works with parents, children, hair & normal particles unlike old length option.
	- Only known issue for now is that children from faces don't get calculated correctly when using path start time.
* New option "trails" for "halo", "line" and "billboard" visualizations:
	- Draws user controllable number of particle instances along particles path backwards from current position.
	- Works with children too for cool/weird visualizations that weren't possible before.
* Normal particle children's velocities are now approximated better when needed so that "line" visualization trails will look nice.
* New particle instance modifier options:
	- "path"-option works better and has controllable (max)position along path (with random variation possible).
	- "keep shape"-option for hair, keyed, or baked particles allows to place the instances to a single point (with random variation possible) along particle path.
	- "axis" option to make rotation handling better (still not perfect, but will have to do for now).

Some fixes & cleanup done along the way:
* Random path length didn't work for non-child particles.
* Cached & unborn particles weren't reset to emit locations.
* Particle numbers weren't drawn in the correct place.
* Setting proper render & draw visualizations was lost somewhere when initializing new particle settings.
* Changing child mode wasn't working correctly.
* Some cleanup & modularization of particle child effector code and particle drawing & rendering code.
* Object & group visualizations didn't work.
* Child simplification didn't work.

1 files changed, 7 insertions, 6 deletions

diff --git a/source/blender/blenkernel/intern/anim.c b/source/blender/blenkernel/intern/anim.c
index 1aceca454d2..6c1b8eb9000 100644
--- a/source/blender/blenkernel/intern/anim.c
+++ b/source/blender/blenkernel/intern/anim.c
@@ -786,8 +786,9 @@ static void new_particle_duplilist(ListBase *lb, ID *id, Scene *scene, Object *p
 	BLI_srandom(31415926 + psys->seed);
 	
 	lay= scene->lay;
-	if((part->draw_as == PART_DRAW_OB && part->dup_ob) ||
-		(part->draw_as == PART_DRAW_GR && part->dup_group && part->dup_group->gobject.first)) {
+	if((psys->renderdata || part->draw_as==PART_DRAW_REND) &&
+		((part->ren_as == PART_DRAW_OB && part->dup_ob) ||
+		(part->ren_as == PART_DRAW_GR && part->dup_group && part->dup_group->gobject.first))) {
 
 		/* if we have a hair particle system, use the path cache */
 		if(part->type == PART_HAIR) {
@@ -804,7 +805,7 @@ static void new_particle_duplilist(ListBase *lb, ID *id, Scene *scene, Object *p
 		psys->lattice = psys_get_lattice(scene, par, psys);
 
 		/* gather list of objects or single object */
-		if(part->draw_as==PART_DRAW_GR) {
+		if(part->ren_as==PART_DRAW_GR) {
 			group_handle_recalc_and_update(scene, par, part->dup_group);
 
 			for(go=part->dup_group->gobject.first; go; go=go->next)
@@ -850,7 +851,7 @@ static void new_particle_duplilist(ListBase *lb, ID *id, Scene *scene, Object *p
 				size = psys_get_child_size(psys, cpa, ctime, 0);
 			}
 
-			if(part->draw_as==PART_DRAW_GR) {
+			if(part->ren_as==PART_DRAW_GR) {
 				/* for groups, pick the object based on settings */
 				if(part->draw&PART_DRAW_RAND_GR)
 					b= BLI_rand() % totgroup;
@@ -894,7 +895,7 @@ static void new_particle_duplilist(ListBase *lb, ID *id, Scene *scene, Object *p
 				pamat[3][3]= 1.0f;
 			}
 
-			if(part->draw_as==PART_DRAW_GR && psys->part->draw & PART_DRAW_WHOLE_GR) {
+			if(part->ren_as==PART_DRAW_GR && psys->part->draw & PART_DRAW_WHOLE_GR) {
 				for(go= part->dup_group->gobject.first, b=0; go; go= go->next, b++) {
 					Mat4MulMat4(tmat, oblist[b]->obmat, pamat);
 					Mat4MulFloat3((float *)tmat, size*scale);
@@ -930,7 +931,7 @@ static void new_particle_duplilist(ListBase *lb, ID *id, Scene *scene, Object *p
 		}
 
 		/* restore objects since they were changed in where_is_object_time */
-		if(part->draw_as==PART_DRAW_GR) {
+		if(part->ren_as==PART_DRAW_GR) {
 			for(a=0; a<totgroup; a++)
 				*(oblist[a])= obcopylist[a];
 		}