scripts/modules/bpy_hydra.py

@@ -91,10 +91,8 @@ class HydraRenderEngine(bpy.types.RenderEngine):
         return {}
 
     # final render
-    def update(self, data, depsgraph):
-        # Note: if bl_use_gpu_context = True, leave this function empty and move engine creation 
-        #       and syncing to render() function
-
+    def _update(self, depsgraph):
+        """This function is preferable to override in child classes instead of update()"""
         engine_type = 'PREVIEW' if self.is_preview else 'FINAL'
         self.engine_ptr = _bpy_hydra.engine_create(self.as_pointer(), engine_type, self.delegate_id)
         if not self.engine_ptr:
@@ -105,7 +103,15 @@ class HydraRenderEngine(bpy.types.RenderEngine):
 
         _bpy_hydra.engine_sync(self.engine_ptr, depsgraph.as_pointer(), bpy.context.as_pointer())
 
+    def update(self, data, depsgraph):
+        # If bl_use_gpu_context is true, this function is ignored and render() is used
+        if not self.bl_use_gpu_context:
+            self._update(depsgraph)
+
     def render(self, depsgraph):
+        if self.bl_use_gpu_context:
+            self._update(depsgraph)
+
         if not self.engine_ptr:
             return
 

source/blender/render/hydra/scene_delegate/mesh.cc

@@ -154,7 +154,7 @@ pxr::HdCullStyle MeshData::cull_style(pxr::SdfPath const &id) const
   if (sm.mat_data) {
     return sm.mat_data->cull_style();
   }
-  return pxr::HdCullStyle::HdCullStyleDontCare;
+  return pxr::HdCullStyle::HdCullStyleNothing;
 }
 
 bool MeshData::double_sided(pxr::SdfPath const &id) const