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I am currently working on the atmosphere pass for a scene with lots of IES lights in it. I've been tearing my hair out trying to get the render times and noise levels reasonable and, after spending far too many hours on this, I discovered the following:
1) With any renderer, your fog will render quickest if you keep your IES lights as point-lights, and not override their shape to conform to their actual size. Not sure if this would give acceptable results close up, but for my purposes it made a world of difference.
2) Nothing has as big an impact on noise in VRayEnvironmentFog as the Image Sampler's Max. Subdivs (at least as far as IES lights are concerned, I don't have any other lights in my scene). I set mine to 24, which added 15% to the render time from 8, but improved the quality 10x. There is still a little noise, but I'll be adding a touch of blur in post to compensate.
If anyone else has tips to add to this, that would be great.
1) With any renderer, your fog will render quickest if you keep your IES lights as point-lights, and not override their shape to conform to their actual size. Not sure if this would give acceptable results close up, but for my purposes it made a world of difference.
2) Nothing has as big an impact on noise in VRayEnvironmentFog as the Image Sampler's Max. Subdivs (at least as far as IES lights are concerned, I don't have any other lights in my scene). I set mine to 24, which added 15% to the render time from 8, but improved the quality 10x. There is still a little noise, but I'll be adding a touch of blur in post to compensate.
If anyone else has tips to add to this, that would be great.
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