Thanks for your suggestions, I appreciate it!

The model ambiance example I know of uses tex_color and 'SCAN_TEXTURE' or are you talking about a certain shader? I need to know the color of the (pixels of the) terrain underneath a model for a certain particle trail effect.

I think I can handle the reading of the pixels through pixel_for_bitmap on the UV of the terrain, but getting the coordinates right is a bit tricky.

I'll look into the Loopix projects, perhaps there's valuable info I've overlooked indeed!

Cheers