Material ID to Texture/UV

[t_smith5]

Hi

Is it possible to render out a model's material IDs to a texture or UV map?

Thanks

[t_smith5]

Okay, so I figured out how to do it via Render to Texture, but is there a way of all the islands being put onto one file...? They're all being rendered to their own texture file, but I need them all in one texture ideally.