Fixes for particle system and physics

- Silence harmless error print about relation.

  Object with particle system which doesn't use physics will
  not have point cache component.

- Tag relations for update when particle system physics type
  change.

  This ensures correct state of point cache component.

This is all part of T59258.

1 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
index 23328721e2c..c8822df28e6 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
@@ -1714,8 +1714,10 @@ void DepsgraphRelationBuilder::build_particle_systems(Object *object)
 	                           DEG_NODE_TYPE_PARTICLE_SYSTEM,
 	                           DEG_OPCODE_PARTICLE_SYSTEM_DONE);
 	ComponentKey eval_key(&object->id, DEG_NODE_TYPE_PARTICLE_SYSTEM);
-	ComponentKey point_cache_key(&object->id, DEG_NODE_TYPE_POINT_CACHE);
-	add_relation(eval_key, point_cache_key, "Particle Point Cache");
+	if (BKE_ptcache_object_has(scene_, object, 0)) {
+		ComponentKey point_cache_key(&object->id, DEG_NODE_TYPE_POINT_CACHE);
+		add_relation(eval_key, point_cache_key, "Particle Point Cache");
+	}
 	/* Particle systems. */
 	LISTBASE_FOREACH (ParticleSystem *, psys, &object->particlesystem) {
 		ParticleSettings *part = psys->part;