> But what if I want to uv-map real objects, not just texture?

Complex objects will be difficult to do this with (if the object is complex
enough, even trace() won't be able to get into all the little nooks and
crannies). But if you use a mesh, and load the mesh data (including,
possibly, UV coordinates) into arrays, you could then operate on each
triangle individually and place small objects along it.

If the object is really simple, like a sphere, then you could manually loop
around its surface (in terms of angles theta and phi) and place objects that
way.

 - Slime
 [ http://www.slimeland.com/ ]

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