Shift your camera or rotate the entire cube itself (using a union) ever
so slightly and the vertical white line will disappear. It's a result of
the opposite front and back edges lining up.



> 
> yep, a wrong value for max_trace_level was the reason,
> but... this is still a mystery to me, because I know I didn't specify
> ANY global_settings in the scene file yesterday, and POV-Ray still
> produced garbage; today I tried again (I didn't make any changes) and
> these black squares were gone! The only explanation I can imagine is
> that POV-Ray crashed (which happens under Windoze95 quite often) and
> after restarting POV-Ray it got a bit confused and somehow used a
> wrong value (6 or 7?) for max_trace_level!?
> 
> Anyway, there is left a strange white vertical line in the middle of
> the rendered picture. Does anyone know why?
> 
> btw I'm using version 3.1a.watcom.win32 [Pentium II optimized]
> 
> would it be possible to achieve the same result (without that white
> line of course *g*) by using density_map / color_map on a _single_
> cube instead?
> 
> Daniel
> 
>  [Image]

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