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The V-Ray Denoiser detects areas where noise is present in the rendered beauty image and render elements and smoothing them out.

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For animations, it is recommended to use the standalone denoiser tool. It performs frame blending and reduces flickering.

The V-Ray Denoiser performs an additional operation to the rendering and changing the denoising settings and denoising the image again does not require re-rendering the scene.

When rendering, the V-Ray Denoiser automatically adds a few render channels in the V-Ray Frame Buffer which are required to guide the denoising algorithm. The two denoising engines require different render elements. Some of them are standard render channels like the diffuse filter color, the reflection filter color etc. A few special channels are also generated for the Default V-Ray denoiser:

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VRayDenoiser can be applied to the Viewport IPR by enabling the Use Denoiser option from V-Ray Renderer > Export > IPR.

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||out Network|| > V-Ray Render Elements node > V-Ray > Render Channel > Denoiser

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VRayDenoiser offers a choice between the the Default V-Ray denoiser and the NVIDIA AI denoiser. Each offers a different denoising algorithm that comes with different benefits. See the denoising engine examples below.

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The Nvidia AI denoiser only works on Nvidia GPUs starting with the Kepler GPU architecture (GTX 6xx series Maxwell and newer )GPU architectures. 

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Use GPU – Enables the usage of GPU if an OpenCL videocard is found– Uses the GPU device(s) to accelerate the denoising calculations. In case there is no compatible GPU device, denoising automatically falls back to use the CPU, even if the option is enabled. When the NVIDIA AI denoiser is used, this option is not available.

Name – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.Denoiser.vrimg).

Engine – Allows choosing between the Default V-Ray denoiser and the NVIDIA AI denoiser. See the denoising engine  examples below. Note that, the NVIDIA AI denoiser requires an NVIDIA GPU.

Preset – When using the Default V-Ray denoiser, the presets can be used to automatically set the Strength and Radius values.

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