> Interesting concept.
> Trying to think of a situation where the presence of objects can only be 
> determined during a render...
> Failing...

"trace" seems to me the most obvious example of "bi-directionality" between
the rendering engine and the scripting language.

(yeah, it's not during a render, it's during parsing, but it relies on data
  (result of an intersection computation) which should be given by the rendering
  engine)

Of course, that kind of feature could be extended to new possibilities, such
as the one evoked.

That's why, IMO, POV-Ray should been seen as a "rendering system", instead of
a "rendering engine fed by a script".

This doesn't mean the rendering engine and scripting system can't be separated
at code level (being able to develop other complete or partial scripting languages
would be great), but whatever interfacing system (bytecode, etc..) takes place
MUST be able to manage that kind of bi-directonality.

Fabien.

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