With the recent threads featuring Marko Dabrovnic's tremendous cathedral model, I thought I'd see if it would respond to True Ambience. I'm delighted to say it does:

Six lights with soft shadows. One 'parallel' outside to represent the sun; one in the tower-dome area; one in the altar area; and three along the ceiling arch. The rest of the lighting is via True Ambience at 64rpp. I'll post another later showing the scene without True Ambience.

Render time was about a day and a half - but there was plenty of other activity on this computer during that time, including further Bryce experiments (I love Bryce5).

Other than a slight crop each side, and jpeg compression, this is exactly how it came out of Bryce.