code: def _update_trsys(self, event):
          
          doc = self.document_node
          scene = self.scene_node
          root = self.root_node
          self.transforms.visual_transform = self.node_transform(scene)
          self.transforms.scene_transform = scene.node_transform(doc)
          self.transforms.document_transform = doc.node_transform(root)
  
          Node._update_trsys(self, event)
docs: Transform object(s) have changed for this Node; assign these to the
          visual's TransformSystem.