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

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