[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.