The V-Ray Denoiser takes an existing render and applies a denoising operation to it after the image is rendered normally. The denoising operation detects areas where noise is present and smooths them out.
UI Text Box
type
tip
The Denoiser render channel can only be enabled from the View Layer Properties tab. After enabling, the node appears in the V-Ray Node Editor's World Node Tree.
See the Render Channels page to find out where you can find these properties.
Channel Name– Customizable name for the render channel.
Enable– When enabled, starts denoising the rendered image in the V-Ray Virtual Frame Buffer.
Engines
V-Ray Denoiser offers a choice between theDefault V-Ray denoiser, theNVIDIA AI denoiserand theIntel Open Image denoiser. Each has a different denoising algorithm that comes with different benefits.
Default V-Ray Denoiser- V-Ray's denoising algorithm. It can utilize the CPU or the GPU (AMD or NVIDIA GPUs) to perform the denoising. It is consistent when denoising render channels, as it applies the same denoising operator to all render channels. This means that it is recommended for denoising the render channels to be used for compositing the back-to-beauty image.
NVIDIA AI Denoiser- V-Ray's integration of NVIDIA's AI-based denoising algorithm. The NVIDIA AI denoiser requires anNVIDIA GPUto work. It does not matter whether the actual rendering was performed on the CPU or GPU. This means that rendering on the CPU still requires an NVIDIA GPU for denoising with the NVIDIA AI denoiser and has some advantages and drawbacks compared to the Default V-Ray Denoiser. For example, the NVIDIA AI denoiser performs the denoising faster, but is not consistent when denoising render channels. This means that there will be differences between the original RGB image and the one reconstructed from render channels that are denoised with the NVIDIA AI denoiser. It also doesn't support cross-frame denoising and will likely produce flickering when used in animation.
UI Text Box
type
tip
The NVidia AI denoiser only works on Nvidia Maxwell and newer GPU architectures. If no proper devices are found, V-Ray silently falls back to the Default V-Ray denoiser.
Intel Open Image Denoiser– V-Ray's integration ofIntel Open Image Denoise. The Intel Open Image denoiser works with your CPU device and does not use hardware acceleration. This denoiser has no controllable options.
Engine–Allows choosing between the Default V-Ray denoiser,the NVIDIA AI denoiserand theIntel Open Image Denoise.Note that the NVIDIA AI denoiser requires an NVIDIA GPU.
Preset– Offers presets to automatically set Strength and Radius values.
Default – Applies 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 the strength of the denoising operation. This value is automatically set by preset selection, but can be changed when Preset is set to Custom.
Radius– Specifies the area around each pixel to be denoised. A smaller radius affects a smaller range of pixels, while a larger radius affects a larger range, which increases the noise removal. This value is automatically set by preset selection but can be changed when Preset is set to Custom.
