global illumination clouds and weird / strange render result

[VRAYCaustic]

I have some problems with V-Ray. I get strange shadows everywhere on my image. I attached the render settings, the result and the .blend file.

Blend-file: http://www.pasteall.org/blend/12294

[bdancer]

Re: global illumination clouds and weird / strange render re

You have low GI settings: I guess you are using sun+sky, but without portal lights in winodwos. Read some tutorials about interior light setup in V-Ray. I'll try to find some time to setup this scene a little later.

[VRAYCaustic]

Re: global illumination clouds and weird / strange render re

Can you tell me good settings which you use? I read already many tutorials but nowhere i can find settings, only explanations.

[ledman]

Re: global illumination clouds and weird / strange render re

very dark scene, increase in irridance map interp. sampl to 100, should be fine

i suggest to put a plane light behind camera to better light a scene

[bdancer]

Re: global illumination clouds and weird / strange render re

[attachment=0:12108qjb]render_Camera.0001.png[/attachment:12108qjb]
Check this setup - hope it helps as a starting point: http://www.pasteall.org/blend/12712

[voytov]

Re: global illumination clouds and weird / strange render re

Thanks very much Andrey.
I have kind of similar problem with my scene and going MAD because even with high LC IM settings I get blotches in final render (eurorender.com/20120412.jpg) although at the IM calculation phases the shadows look 100% perfect with NO sign of "any turbulence" .
I suspect the problem with my scene is that it is lit only with tiny, distant light spots and it's generally dark. But it is planned it has low light levels. Don't know how to figth artifacts in such condition...

Any clues?
Thanks