Gyscos wrote:
> It might work with convex objects. But if there is a hole inside the object, I
> may never find it with trace.
> Besides, from where would I "send" the trace vectors ? It would need to be from
> outside the object, but I don't know the size of the object... (ok, we could add
> a size parameter to the macro...)

I don't know if this will help your larger problem, but you can find the 
size (or at least the bounding box size) of an arbitrary object using 
the min_extent and max_extent functions.

For example:
#declare Size = max_extent(Obj) - min_extent(Obj);

This gets a 3D vector with the x, y, and z sizes.  When the bounding box 
of the object doesn't match the actual object very well, the results can 
be inaccurate, but for many objects it does the trick.

-- 
-The Mildly Infamous Blue Herring

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