The Node Editor is very helpful, thanks! however I would like to be able to import a glb for example with a pbr material and see how it’s made. My workaround right now is to use blender, but that won’t work for custom glsl shaders, any way to do this?
Nope, the materials used in NME and GLTF are different even if internally they rely on some shared code.
You could use the babylon inspector to see which pbr properties have been set. Those should match with the PBR block setup.
if there is a custom non-PBR babylon shader material and I don’t have the source code or the original NME, is there a reliable way for me to recreate it?
Unfortunately no 