shadow pass noisy

[jasonhuang1115]

Hi,

We have been having this issue lately where the shadow pass created through matte surface looks smooth in alpha channel, but when it's inverted or merge (over) a background, the core of the shadow has lots of noise/artifacts. Even when we push the noise threshold to 0.001. Rendering with production CPU rendering (not GPU RT).


OS: Windows 10 x64, Maya 2017 update 3, Vray 3.52.02.

The alpha looks smooth.

When it's merged (over) a white background, the transition area is not that smooth anymore.
Here is the same shadow pass again a checkerboard.
another example of the issue.

[Morbid Angel]

just a guess but it could be light \ shadow threshold clipping it out.

[jasonhuang1115]

Hey Dmitry,

Light cut-off threshold was set to 0.001 (guess this is default) and shadow bias at 0.02 (also default I guess). Are you referring to this setting or something else?

[Morbid Angel]

no that was it. Perhaps post a sample scene of this issue.