@Browork, these video guides by the Babylon team are amazing: https://www.youtube.com/results?search_query=node+material+editor
I’m not a Node Material or shader expert, though I think these are powerful approaches, since they offer so much customization flexibility.
Found some resources below on possible starting points when creating an outline shader or Node Material:
https://alexanderameye.github.io/outlineshader.html
Even though the Node setups in the resources above were created outside of Babylon, there is much to learn from these when implementing your own in https://nme.babylonjs.com/
The Babylon community was extremely helpful when I first tried learning Node Materials (Node Material: Dissolve Effect). If you have questions when creating your own custom material or shader, I’m sure the community would be happy to help 