Fix T42395: Stored "render data" in particles mismatches the particle

amount and crashes after Cycles render.

This is a hack to fix this, but at this point the system is hopelessly
broken anyway and no good fix other than total rewriting is possible.

2 files changed, 8 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_particle_types.h b/source/blender/makesdna/DNA_particle_types.h
index a2a724b6a32..dd25a49c476 100644
--- a/source/blender/makesdna/DNA_particle_types.h
+++ b/source/blender/makesdna/DNA_particle_types.h
@@ -293,7 +293,7 @@ typedef struct ParticleSystem {
 	short vgroup[12], vg_neg, rt3;			/* vertex groups, 0==disable, 1==starting index */
 
 	/* temporary storage during render */
-	void *renderdata;
+	struct ParticleRenderData *renderdata;
 
 	/* point cache */
 	struct PointCache *pointcache;
diff --git a/source/blender/makesrna/intern/rna_particle.c b/source/blender/makesrna/intern/rna_particle.c
index 113311383f4..47d8263d71f 100644
--- a/source/blender/makesrna/intern/rna_particle.c
+++ b/source/blender/makesrna/intern/rna_particle.c
@@ -589,8 +589,14 @@ static void rna_ParticleSystem_set_resolution(ParticleSystem *particlesystem, Sc
 		particle_system_update(scene, object, particlesystem);
 	}
 	else {
-		if (particlesystem->renderdata)
+		ParticleSystemModifierData *psmd = psys_get_modifier(object, particlesystem);
+		
+		if (particlesystem->renderdata) {
 			psys_render_restore(object, particlesystem);
+		}
+		
+		psmd->flag &= ~eParticleSystemFlag_psys_updated;
+		particle_system_update(scene, object, particlesystem);
 	}
 }