Warp wrote:

>   However, you could try translating your camera by a minuscule amount
> (like 0.001) to some direction (but not vertically, because the walls
> are vertical at the problematic place), and it might correct the problem.
> It's enough for the sampling point to be taken just slightly from a different
> place.
>   If you are out of luck, you might get a similar artifact somewhere else.
> If this is the case, try translating the camera by a different amount.
> 
>   Another possible solution (which is not a generic one but which probably
> works here) is to make the right wall shadowless and put a copy of it
> behind it (very close to it, but not too close). This way the sample
> rays going outside the room will hit this second wall (which will be
> illuminated by the light source because the original wall is now
> shadowless).
> 

If the problem is caused by the sharp angle, wouldn't it be possible to 
smooth the edge, for example by fitting a quarter cylinder in the corner 
? I've never tried that, but maybe it could solve the missing 
intersection problem ?

Regards

-- 
Vincent

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