Thanks Chipp!
Yep i have one tutorial on interior Radiosity, in a closed room, with a combo of an interior point source light and an exterior 'sun' through a large window (small skylight too). The room model is available for download in Vue .vob format. The tutorial was done in Vue 5 Infinite.

Radiosity is kind of finicky and long on render times. I think Chipp's idea of removing the ceiling would make it both easier and of higher quality.

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'Art Head Start.com Free chapter, Vue tutorials, models, Web Tutorials Directory.