Well if your color depth is only 16bit, you probably are running into a
case of software dropping the color depth down and not dithering.  (I
did a scene with 236 unique colors using 27 spotlights and atmosphere
and several thousand samples and there still were bands unless I raised
my display depth to 24bit and then they dissappeared.  The black stripes
could possibly be a result of a low render depth.  

Steve


Glenn Beaton wrote:
> 
> Humm.. This one's been bothering me a lot the last few weeks. I haven't
> sat down and really -worked- at it much, but, yeah. Here it is. I have a
> scene where there are four (eight, actually, but only four have
> atmospheric_attenuation on) spotlights shining on a single die. I had
> been planning on having the die spin around a few times, with the
> spotlights doing a bit of a thing around the box the die is inside.
> Well, I first got past the rather awkward problem of having
> atmosphere-in-a-box, and I rendered the new scene. It was coming along
> rather nicely (slow, but it looked nice enough to me).. until I saw
> where the spotlights all met. There was some rather nasty lookign
> interference there.. anti-aliasing, I think. Mach bands, or something
> like that. Anyway, I jacked up the samples and jitter rate, and the
> problem is still there. -PLUS-, even weirder, I find, it screwed up the
> texture of the box. It ended up with these odd black stripes.. Strange.
> Can anyone help me out? It'd be muchly appreciated.
> 
> Glenn

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