Cycles: Improve logging about motion blur a bit

1 files changed, 6 insertions, 1 deletions

diff --git a/intern/cycles/blender/blender_mesh.cpp b/intern/cycles/blender/blender_mesh.cpp
index ef193665972..55ef913408f 100644
--- a/intern/cycles/blender/blender_mesh.cpp
+++ b/intern/cycles/blender/blender_mesh.cpp
@@ -976,7 +976,12 @@ void BlenderSync::sync_mesh_motion(BL::Object& b_ob,
 			   memcmp(mP, &mesh->verts[0], sizeof(float3)*numverts) == 0)
 			{
 				/* no motion, remove attributes again */
-				VLOG(1) << "No actual deformation motion for object " << b_ob.name();
+				if(b_mesh.vertices.length() != numverts) {
+					VLOG(1) << "Topology differs, disabling motion blur.";
+				}
+				else {
+					VLOG(1) << "No actual deformation motion for object " << b_ob.name();
+				}
 				mesh->attributes.remove(ATTR_STD_MOTION_VERTEX_POSITION);
 				if(attr_mN)
 					mesh->attributes.remove(ATTR_STD_MOTION_VERTEX_NORMAL);