How to swap material based on current render pass?

[bilel.deb (Debyaoui Bilel)]

I want to only see the normals of a certan object, and nothing else.
I want to do what was explained here:

Issues with rendering Custom Depth

I find it highly undesirable and would like to just render a solid color opaque material when drawing into custom depth This is how I handled Translucent objects in Custom Depth, I added some code to allow me to check from the Scene Proxy if its currently rendering Custom Depth, and if my object is translucent I swap out the material for a basic opaque material. [15530-translucentcustomdepth.jpg]

instead of custom depth I want it when rendering normals. my material should be translucent/invisible, and when rendering world normal It gets swapped to an opaque material.