I’m not aware of anyone working on an OIDN plugin for Natron as of yet.
I agree with Hank that OIDN might get heavy but I think it might be a good addition to Natron. I haven’t tried any of the existing denoising nodes in Natron with renders, only with camera footage. Like Hank said, renders are usually denoised at the renderfarm. However, looking at the approach Blender took with the denoise node in the compositor, I think it would be similar to have something like that in Natron IF it takes at least the avg shading normal (denoising normal), albedo and Zdepth passes into account while denoising… OIDN doesnt produce the best results when only using the noisy image.
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