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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:

  1. Ensure that you are using the most recent Nvidia GPU driver version (see here). 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 OptiX denoiser will detect the original AOV.
  5. By default, Arnold will not use the GPU if it has less than 512Mb available when Arnold starts. You can either try to free up GPU resources by quitting applications using the GPU or lower the Min. Memory (MB) settings. 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.
  • Arnold will automatically force a box_filter on outputs with filters with known issues when either of the denoisers are used. This is because the OptiX denoiser does not perform well with filters that span across multiple pixels.
  • Denoisers won't work as well after imagers have been applied to them. Therefore denoisers should be applied before any other post-processing imagers (top of imagers list).
  • The OptiX denoiser only works on full frames rather than buckets.


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