Depsgraph: Fix assert failure on Cycles render

Was happening when there was material in bmain but not used by any object.

1 files changed, 10 insertions, 2 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph_query.cc b/source/blender/depsgraph/intern/depsgraph_query.cc
index 2ff423acc9c..4e0ab0f77a0 100644
--- a/source/blender/depsgraph/intern/depsgraph_query.cc
+++ b/source/blender/depsgraph/intern/depsgraph_query.cc
@@ -104,8 +104,16 @@ Object *DEG_get_evaluated_object(Depsgraph *depsgraph, Object *object)
 
 ID *DEG_get_evaluated_id(struct Depsgraph *depsgraph, ID *id)
 {
-	DEG::Depsgraph *deg_graph = reinterpret_cast<DEG::Depsgraph *>(depsgraph);
-	return deg_graph->get_cow_id(id);
+	/* TODO(sergey): This is a duplicate of Depsgraph::get_cow_id(),
+	 * but here we never do assert, since we don't know nature of the
+	 * incoming ID datablock.
+	 */
+	DEG::Depsgraph *deg_graph = (DEG::Depsgraph *)depsgraph;
+	DEG::IDDepsNode *id_node = deg_graph->find_id_node(id);
+	if (id_node == NULL) {
+		return id;
+	}
+	return id_node->id_cow;
 }
 
 /* ************************ DAG ITERATORS ********************* */