[Feature request] Custom shader for a Shape or/and custom shader Shape

[trsh]

This sounds a bit insane maybe :D, but I would like to be able, to put a custom shader on a shape. Any shader language works for me. Input could be depth, original calculated color, normal, etc. of the shape. Output my defined/modified color.

Why?

Useful for planet simulations- For pixel precision heightmap from far away. Displaying misc distant things, like moon in background, without faking it with a small voxel, then you have to displace, to not run into it. Textures, when needed. Own water shader. Flame shader, etc.