OptiX™ Denoiser

The OptiX Denoiser (based on Nvidia AI technology) is integrated into Arnold for use with IPR (so that you get a very quickly denoised image as you're moving the camera and making other adjustments). It can be applied to any AOV.  


Rendering with the AOV set to Denoise with OptiX


There are a couple of requirements to be aware of when using the OptiX denoiser, however:

  1. You must have a Nvidia GPU with a driver version of at least 390 installed. Note that the OptiX denoiser is not available on OSX.
  2. The OptiX denoiser does not work with Merged AOVs (unlike the Arnold Denoiser).
  3. If you want to use the OptiX denoiser on multiple AOVs you must apply it to each AOV.
  4. If you wish to have the same AOV saved to EXR in both original and denoised mode, to avoid name duplication you can add the suffix "_denoise" to the AOV name and the OptiXdenoiser will detect the original AOV.
  5. Depending on the scene size, you may have to lower the Min memory - Render Settings > System > OptiX denoiser > Automatic Device Selection. This is also dependant on how much memory you have on your GPU. The default settings act on the side of caution and won't use your GPU if you have less than 512Mb available so that all GPU resources aren't used or worse try to use more memory than is available on the GPU. Users can change this parameter at their own risk.

The OptiX denoiser only works on full frames rather than buckets.

The OptiX denoiser is only compatible with a Nvidia driver version of at least 390 installed.


The workflow is as follows:

  1. Enable the new Denoise (Optix) option on the AOV object (or in AOVs).


2. You can then select the denoised version of the AOV in the IPR Window.


3. The RGBA_denoise should now be visible in the IPR window.

Beauty render. Rollover image for RGBA_denoise AOV

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