The V-Ray Denoiser detects areas where noise is present in the rendered beauty image and render elements and smooths them out. Images can also be denoised using the standalone vdenoise tool included with the installation of V-Ray for 3ds Max.
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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.
There are three denoising engines to choose from - the Default V-Ray denoiser, the NVIDIA AI denoiser (V-Ray's implementation of NVIDIA's AI-based denoising algorithm), and the Intel Open Image Denoise. See the Denoising Engines section for more information.
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 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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The effectsResult channel holds the result of the denoising operations and the lens effects that are executed over that image.
The noiseLevel channel is the amount of noise for a pixel as estimated by the V-Ray image sampler.
The defocusAmount channel contains the estimated pixel blurring in screen relevant for depth of field and motion blur. It's black when none of them is enabled
The VRayDenoiser channel contains the result of the noise removal. This channel appears in the VFB only if Mode (found in Advanced denoiser parameters rollout) is set to Show denoiser result channel.
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Currently the scene can calculate only one VRayDenoiser Render Element. Future versions of V-Ray will support multiple VRayDenoiser Render Elements with different settings.
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VRayDenoiser is also applied in Viewport IPR when the mode of the render element includes denoiser result channel calculation. It can be disabled for Viewport IPR by setting the Post effect rate value to zero.
||Render Setup window||> Render Elements tab > Addbutton >VRayDenoiser
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To denoise multiple render elements, enable the denoise checkbox for each render element in the scene that needs to be denoised.
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This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
Deep output– Specifies whether to include this render element in deep images.
Denoising engine – Allows choosing between the Default V-Ray denoiser, the NVIDIA AI denoiser, or Intel Open Image Denoise. See the denoising engineexamples 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.
Default – Applies a mid-level denoising. Mild – Applies a more subtle level of denoising than the Default preset. Strong – Applies a stronger level of denoising than the Default preset. Custom – Allows the Strength and Radius parameters to be set to custom values.
Strength – Determines how strong the denoising operation is. Larger values remove noise more aggressively, but may blur the image too much.
Radius – Specifies the area around each pixel to be sampled for determining how to denoise a given pixel. Larger values produce smoother results, but slow down the denoiser.
Temporal mode – Only available with the NVIDIA AI denoiser. When enabled, the Denoiser uses information from previous frames to create a smoother transition. Useful for rendering animation.
Panorama– When enabled, V-Ray considers whether the image is rendered with a spherical panorama camera with FOV of 360 degrees. This prevents visible seams caused by the denoising process.
Denoise alpha – Enabled by default. When disabled, the Аlpha channel remains undenoised.
Update – Reapply the denoising operation when the required render elements are already present in the V-Ray frame buffer. The elements can be either generated from a render operation in 3ds Max, or by loading a multi-channel .vrimg or OpenEXR into the V-Ray frame buffer. Use this button to apply denoising again after settings in this rollout have been changed.
