What are all the shader options in Open3D?

When creating a mat = open3d.visualization.rendering.Material(), we usually assign a shader. So far I only saw and used "defaultLit"/"defaultUnlit"/"unlitLine", and I noticed that I can't find any documentation on the material shader options.

Can you please provide a full list of shader options here (and maybe a short explanation on what it does/how to use) or add it to the documentation? Thanks