Maxwell Render 4.1 Denoiser Usage
Post on Maxwell Forum June 19 2017
This is an interesting post on the usage and effects of using the DeNoiser functionality inside Maxwell Render 4.1 and based on a render made at
SL : 12
If you turn denoise on, what happens is Maxwell actually renders two renders at the SL you specified in render options. Besides these two renders it also renders reflectance, normals and position channels which it will use to decide what is detail in textures/materials that should be kept and what is noise. It also compares the noise in those two renders to further help with the accurate noise reduction, without removing details like normal noise reduction can do.
The difference between the “fast” and “accurate” presets is that the accurate one also renders a shadow channel (in addition to all the others) and this might be of help to determine where to apply NR. But so far I haven’t found much difference and the thing is the shadow channel takes a long time to render. So far I’m using the fast preset so it skips the shadow channel.
I also set the scenes SL to about SL11, because remember you get two renders with NR, so the two merged ones is more like SL12. It depends on the scene how high your initial SL should be, but I think it will be pretty rare to go above SL 12. Maybe only in very difficult scenes where the noise is still very course also at SL 13 or so.