Left: without denoising. Right using imager_denoiser_optix. The OptiX™ denoiser (based on Nvidia AI technology) is available as a post-processing effect. This imager also exposes additional controls for clamping and blending the result. It is integrated into Arnold for use with IPR as an imager (so that you get a very quickly denoised image as you're moving the camera and making other adjustments). There are some requirements to be aware of when using the OptiX denoiser, however:
Input
Input points to the previous imager operation in the chain (so that you can stack them and apply multiple operations serially).
Enable
Enables the imager.
Layer Selection
Selects layers processed by this imager with a glob or operator expression. An imager can use a selection to determine what nodes will be selected to be processed by the imager at render time. The selection is an expression that can consist of multiple selections concatenated by: Each selection uses glob patterns and regular expressions and a node will be processed by the imager if the expression matches the node name. By default, glob matching is used unless the selection is in a regex quote, i.e. or
(union)and
(intersection)not
(negation)and not
(exclusion)()
for nested scopingr'<my_regex>'
. For example:specular or diffuse
not r'sss_(direct|indirect)'
r'color_(mask1|mask2)' or r'mask[34]'
Output Suffix
When set, creates a new additional output with the input name plus the suffix in which the denoised result will be written into. For example, when denoising the "RGBA" AOV with the output_suffix set to "_denoised", the denoised result will be written into a new "RGBA_denoised" output. It only works with multi-layer drivers.
Blend
Linear interpolation between the input and the denoised output.
Clamp
Clamps the input to the denoiser to a given range.
Clamp Min
Minimum value to clamp to.
Clamp Max
Maximum value to clamp to.
Use Feature AOVs
Enables the use of additional N and albedo AOVs to improve denoising quality. In cases where something other than the beauty is denoised, it may prove better to disable this option.