Possible fix for [#26190] Changing particle amount crashes

* In some cases fluid particles could be born at the exact same locations. Now these cases are just ignored and such particles don't effect each other.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c
index c1a6558aea3..fd792168c6b 100644
--- a/source/blender/blenkernel/intern/particle_system.c
+++ b/source/blender/blenkernel/intern/particle_system.c
@@ -2286,6 +2286,10 @@ static void particle_fluidsim(ParticleSystem *psys, int own_psys, ParticleData *
 
 	/* pressure and near pressure */
 	for(n=own_psys?1:0; n<neighbours; n++) {
+		/* disregard particles at the exact same location */
+		if(ptn[n].dist < FLT_EPSILON)
+			continue;
+
 		sub_v3_v3(ptn[n].co, pa->prev_state.co);
 		mul_v3_fl(ptn[n].co, 1.f/ptn[n].dist);
 		q = ptn[n].dist/h;
@@ -2305,6 +2309,10 @@ static void particle_fluidsim(ParticleSystem *psys, int own_psys, ParticleData *
 
 	/* main calculations */
 	for(n=own_psys?1:0; n<neighbours; n++) {
+		/* disregard particles at the exact same location */
+		if(ptn[n].dist < FLT_EPSILON)
+			continue;
+
 		npa = psys->particles + ptn[n].index;
 
 		rij = ptn[n].dist;