Grassblade wrote:
> 
> Regarding tracing inside the box, if a ray gives a hit on the object, skip
> the next both in up and side directions, and trace the second ray instead.
> If it's a hit again, then assume the intermediate (skipped) ray is a hit
> too. If it's a miss, then go back to the skipped ray and trace it.
> I can already hear purists screaming to the top of their lungs that it's not
> accurate, and I happen to agree, but since it appears we're writing the
> wish-list of Pov 4, I might as well chime in. This method might be useful
> for previews, quick tests, big renders and hopefully for real-time
> raytracing. The final render would take the usual route, although that
> should be up to the user.
> 

IIRC something like what you describe is used by federation against 
nature in their RealStorm engine: http://www.realtimeraytrace.de/.
That demo was cool a couple of years ago but advances in graphics 
hardware has made it less spectacular. The image quality is not even 
close to what Povray can do.

-- 
Daniel Nilsson

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