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Use the Arnold Denoiser imager when rendering a single frame.

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An example denoising scene can be downloaded here.


For the denoiser to work you first need to setup AOVs by using a combination of ArnoldOutputChannelDefine and RenderOutputDefine node pairs, where you set up the AOV in the former, creating a channel, and then the latter uses that channel to set up an actual render output.

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Once they are defined add an ArnoldDenoise node where you can specify which outputs are to be denoised.  It creates the basic needed required AOVs for you automatically (note: not render outputs, just "AOVs"). However, but you have need to create additional outputs if you want them to be denoised or if you want them to be used as a denoiser: albedo, etc.  

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Example denoising setup

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