Hi, i implemented progressive refinement radiosity and lightmap production. From what i have read and (think) i have understand, the scene is done when the remaining undistributed energy is very small, like < EPSILON. but this does not work for all scenes. in some scenes, it only works with ( < EPSILON ), on others, the image is still not ready and i need to run many more passes to make it look good. then i need to specify a constant number of passes (on some scenes over 250000, even if the scene is very small and there is only one light source!!!!). another problem is, some walls don´t get even indirect illumination, they just stay black. can someone give me a hint? thanks in advance! Gammastrahler

Most commercial programs indicate the progression in percentage, and you usually set the limit in percentage too. That is, use the initial shot energy to find the percentage, and use that instead.