Fix bug #19699: point density texture doesn't save particle system.

Non-ID pointers in DNA can only point to data from own ID block, so
now instead it uses an index into the particle system list, but still
exposed as a pointer through RNA.

1 files changed, 6 insertions, 3 deletions

diff --git a/source/blender/render/intern/source/pointdensity.c b/source/blender/render/intern/source/pointdensity.c
index c1cca4e217a..2b3e6047af4 100644
--- a/source/blender/render/intern/source/pointdensity.c
+++ b/source/blender/render/intern/source/pointdensity.c
@@ -236,11 +236,14 @@ static void cache_pointdensity(Render *re, Tex *tex)
 	
 	if (pd->source == TEX_PD_PSYS) {
 		Object *ob = pd->object;
+		ParticleSystem *psys;
 
-		if (!ob) return;
-		if (!pd->psys) return;
+		if (!ob || !pd->psys) return;
+
+		psys= BLI_findlink(&ob->particlesystem, pd->psys-1);
+		if (!psys) return;
 		
-		pointdensity_cache_psys(re, pd, ob, pd->psys);
+		pointdensity_cache_psys(re, pd, ob, psys);
 	}
 	else if (pd->source == TEX_PD_OBJECT) {
 		Object *ob = pd->object;