Noisy render in specific zones

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  03 March 2014
Noisy render in specific zones

Hi everyone,

I have some difficulty to resolve my problem.
I use MentalRay for character project in Maya. Here is a part of my render :

As you can see, I have a noisy effect in specific zone :
-Back Hair

My lighting setup is a studio-like one. Three areaLights : One Keylight, one fill, and one back.
I also use Raytrace Shadows on them. (1 Ray, and 8 for the depth limit)

I think my Sampling is good for Raytrace :
-Adaptive Sampling
-Max level : 2
-Contrast : 0.1

Have you any idea to resolve this ?

Thank you
  03 March 2014
Have you tried increasing shadow samples?

Also, try using unified sampling if you have a new-enough version of Maya (it's in 2012 and 2013, just hidden in string options). The old adaptive sampler won't deliberately target-fire shadow and reflection noise the way unified-sampling will.
  03 March 2014
I don't have much experience with the unified renderer but I will say that that contrast ratio is quite high, I'd usually have it on 0.01 or less.
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  03 March 2014
Thank you for your answers,

So I decided to check a little bit all the paramaters which can be affect it.

Here's the results in order :

1 - One Shadow Ray / Adaptive Sampling (2 max / 0.1 threshold)
2 - Four Shadow Rays / Adaptive Sampling (2 max / 0.1 threshold)
3 - Sixteen Shadow Rays / Adaptive Sampling (2 max / 0.1 threshold)
4 - One Shadow Ray / Fixed Sampling (2 / 0.1 threshold)
5 - Four Shadow Rays / Fixed Sampling (2 / 0.1 threshold)
6 - Four Shadow Rays / Adaptive Sampling (2 max / 0.01 threshold)

I think the threshold is a good way, but 0.01 is the mininum value...
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