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Hello everybody.
At first, sorry for my English.
I have a scene with wardrobe with glass shelves and doors. I rendered it with pmc (32 maxdeth, more than 16000 samples per pixel). But there are a lot of noise there. What is the reason? What I have to do for a good result in future?
Attach - render after resize, 1600x1200. Original resolution was 3200x2400 pxl.



Here is another scene and all is OK with noise with 9900 samples per pixel (here too, 1600x1200, original res was 3200x2400)...

I think its the type of scene that is the problem. Lots of glass and small spaces inside the shelves will make it hard for the renderer to get enough samples. You can probably render all the way to 64000 samples in a scene like this and still have noise left. I´m sorry but I have no solution to offer other than to use less glass, bigger spaces inside the shelves and let it render for as long as you can. Perhaps more experienced "octaners" can offer better suggestions.

If you can, remove the walls behind the camera to let some light in the room.

Hi,
i think so that problem is too much emitter, glass (maybe with dispersion) and glossy surface.
I have the same problem with my rendering.
I don't have a very solution but if you try at change some materials glossy>diffuse maybe the noise it's reduction and the rendering time is too fast (that's my opinion!! )
Sorry for my english too .

Thank to everybody for helping!

this is reason why i hate unbiased render engines...i hate explenation"you put too much glass" or "you have small spaces"
Use vray or something else (for now)

I think that something is wrong with your settings. You try to light the scene only with the bulbs install in ceiling or wardrobeand and it's not right!!! Octane is still not physically correct. It has a problem with correct light emision from emitters materials. It work much better with IES lights.

Look what I did in 1h rendering on GTX460 (with GTX580 it would be 30min)

-evermotion scene - night lightning simulation
-oryginal render in 4096x2048 (downscaled to 2048x1024)
-hotpixel removal in Octane
-noise reduction and White balance in PS
-forgot to turn on smooth on lamps