Twyst wrote:
> 
> Deneux Johann wrote in message <355F26DB.30CB6D30@club-internet.fr>...
> >Hello everybody. I have encountered a problem, what could even be a bug.
> >

> Try this:
> 
> union
> 
>   box { <0,0,0>,<1,9,1>}
>   box { <0,0,0>,<6,1,1.0001> }
> 
> That will solve the problem.

Thanks, but I know the 'coincident surface' problem. But the problem is
elsewere. I explain:
Here is a YZ view:


                         0   0.5     1     1.5   Z->
                             ______________
                         ____|_______     |          ^
O ---------------------> |   |      |     |          |
                         -----------      |          Y
                         ^   |____________| <-
                         |                    |
camera           _  part of L               panel


I hope it is understandable, but the best is to render the scene, and
view it under different points of view.
The coincidence problem appears at Z=1, because POV doesn't know whether
the ray will intersect with the first or the second box composing the L.
In fact, there is no problem, as both surfaces have the same textures
properties. Anyway, I tried your solution, and it didn't work.

The true problem is that POV detects some intersections at Z=0.5. He
shouldn't, as this point is INSIDE the L.

So, I think this may be a true bug, and not a 'known feature' ;-)
Does anybody have any ideas ?

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