super noisy lights

[johnzapf]

Hi there folks,

I have this interior render with area lights as well as mesh blackbody emission. The mesh lights work fine but maybe that's just because they are close up. The back of the image is horrible and I haven't even turned the glass on. Any help on my settings would be appreciated.

Thanks

John

https://drive.google.com/open?id=1sdMF6_UxYB67KR9NlXhMsmccrxkMFdZV

[paride4331]

Hi johnzapf,
Reduce Specular in materials when it is possible (walls, for example) and avoid using Roughness 0.
Do not use specular material for windows, (you could hide the glasses), but if you need glass, use a glossy material, edit IOR and falloff skew factor in falloff map into opacity.
Leaves openings behind the camera.
Normal maps and even displacement can generate noise, be careful about quality and if you could replace it with bump map.
Do not add color correction, projection, and tranform node in hdr map using Texture Environment.
Simple geometries with emission significantly reduce noise, you could use this trick:
viewtopic.php?f=27&t=60648&p=310376&hilit=+bulb#p310376
Regards
Paride

[Erick]

Thanks for the info, or better said " heads up", paride4331, as I always forget about the trick of using the glossy mat. with the opacity falloff for glass. ...now, when using this trick, is it recommended, to let the glass/window have a little bit of thickness, too, or could it be just a simple plane, with no thickness at all? Thanks.

[paride4331]

Hi Erick,
definitively a simple plane.
Regards
Paride