Erlik: That's exactly what I mean. The Guru's use tricks to work around the limits of their hardware and/or software. That's what makes them stand out above the rest. And one of those tricks for bryce is rendering only parts of the scene at a time and compositing the complete image/animation in another (often 2D) app. It can save days of rendertime and it can allow for making much more detailed and complex scenes wich would normally be impossible due to things like lack of memory. That's why I think there must be some compositing postwork allowed.

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