message: Update shading model display
  This changelist updates the shading model display in MaterialXView, adding handling for renderable material nodes in 1.38.5.
diff: @@ -608,9 +608,15 @@ void PropertyEditor::updateContents(Viewer* viewer)
  }
  // Shading model display
  - if (elem->isA<mx::Node>())
  + mx::NodePtr node = elem->asA<mx::Node>();
  + if (node)
  {
  - std::string shaderName = elem->getCategory();
  + std::string shaderName = node->getCategory();
  + std::vector<mx::NodePtr> shaderNodes = mx::getShaderNodes(node);
  + if (!shaderNodes.empty())
  + {
  + shaderName = shaderNodes[0]->getCategory();
  + }
  if (!shaderName.empty() && shaderName != "surface")
  {
  ng::Widget* twoColumns = new ng::Widget(_container);
  