See discussion in p.u.p
JRG's problem was to view through an object (wall) but still having the object 
interact with the scene, especially for radiosity (so no_image was not really ok).
JRG's proposed solution was to have a visibility level... 
I did not like that solution, (and still don't),
and here are some illustrations of another possible solution.

There is 4 reflective planes, and a container around a sphere.
there is also a box and a cone to help to localize in space and reflections.

The container is: a sphere, a box, a rotated box and a cone.
My solution is a new object(*) which has intersections only
with rays whose direction is same as the normal of the surface.

(*): syntaxe is kind of CSG-like restricted to one child. I called it "nexus".
Syntax is : nexus { OBJECT [OBJECT_MODIFIERS...] }

Any interest ?

P.S: Due to the removed intersections, it is not wise to use the nexus in CSG!!!
-- 
Non Sine Numine
http://grimbert.cjb.net/

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