hi,

It seemed default gamma make more noise. How to optimize mantra to reduce noise for 2.2 gamma? Which gamma is better in production?
thanks!

In Mantra/Properties/Shading Color Space Set to Gamma 2.2

The default Mantra/Properties/Shading Color Space is already 2.2. Any other option?

Those brighter dots are part of individual buckets, adjacent buckets don't talk to each other, so they can't use ray variance to reduce noise levels between them. Those buckets look mostly in the shadow with a but poking into the light. The reduced variance sampling is showing up in the lit bit!

You have a few options.

Drop the noise level and/or increase the Max Ray Samples in Mantra

Add more samples to the light itself

Switch to depth map shadows in the light. By default the IPR renderer will always render ray-traced shadows though. There is a setting to change that a bit hidden in the Edit Parameter for Mantra or you can render to MPlay and it will depth map it.

You could drop the Tile Size too, that will make those buckets smaller and should lessen the bright dots.

Lastly you can increase Pixel Samples - this is bit of a sledge hammer approach but will work!