internal protected void TrySetDefaultMaterial()
 {
     if (handleMaterial == null)
     {
         handleMaterial = VisualUtils.CreateDefaultMaterial();
     }
     if (handleGrabbedMaterial == null && handleGrabbedMaterial != handleMaterial)
     {
         handleGrabbedMaterial = VisualUtils.CreateDefaultMaterial();
     }
 }