if you're rendering in Bryce,and it's an interior scene, turn off the atmosphere and get a completely black stage. Then use small,dim, radiant lights wherever you want your light sources, such as torches, candles, etc. if it's outdoors, make it a very dark sky and do the same thing. Or create and object, then in Bryce group a radiant light or spotlight with it. On all those, play with luninosity and falloff till you get what you want. Using texture gels over the lights also gives interesting effects.

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