I've been curious about this for a long time, but I never tried to figure out an answer. Now that my scenes are becoming more complex and requiring more time I was wondering if I was missing out on something. Anyway, can someone explain the difference between using 'Optimizations for clustered scenes (BSP)' against 'Optimizations for uniform scenes (grid)'? I keep it on the second option for uniform scenes because it was the default when I first got Bryce a long time ago. Are there advantages to using one or the other? I'd truly appreciate any help anyone can offer. Thanks in advance!