Noise in render

Question

I'm creating a test rig to demonstrate rendering using only an environment map and glow materials. There are no lights in the above scene. I'm getting quite a lot of noise on walls. I'm using interior best as a starting point. Microstation version is SS4. Any suggestions gratefully received.

Jerry Flynn · Answer

Hi Duncan, 
 
Try this in the render settings dialog on the global illumination tab set the indirect range to 3 or 4 meters this will terminate the indirect rays early and sample will come from the environment. BTW this is a total cheat you could even illuminate that interior using the environment even without the openings for windows. If this works and you are happy with the results you could probably use interior good and it would be much faster to render and be good enough. 
 
We added irradiance smoothing setting in CONNECT Edition if you were suing that you could have increased the default value a little and that would have helped with the noise. 
 
Cheers, 
 
Jerry