This page provides information on the Denoiser rollout.
Overview
The V-Ray Denoiser takes an existing render and applies a denoising operation to it after the image is completely rendered out via normal means. The denoising operation detects areas where noise is present and smooths them out.
The V-Ray Denoiser operates on other render elements rather than being part of the rendering process itself, therefore the denoising operation does not require re-rendering of the project. The Denoiser settings can be quickly changed and tested over and over to improve the result.
Currently, the project can contain only one Denoiser preset. Future versions of V-Ray will support simultaneously multiple Denoiser channels with different settings.
Parameters
Denoiser – Activates V-Ray Denoiser channel.
Engine – Allows choosing between the Default V-Ray Denoiser, NVidia Al Denoiser, or Intel Open Image Denoise. Each offers 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 elements, as it applies the same denoising operator to all render channels. This means that it is recommended for denoising the render elements to be used for compositing back the beauty image.
NVIDIA AI denoiser - V-Ray's integration of NVIDIA's AI-based denoising algorithm. The NVIDIA AI denoiser requires an NVIDIA GPU to work, regardless of 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 elements. This means that there are differences between the original RGB image and the one reconstructed from render elements that are denoised with the NVIDIA AI denoiser.
The Nvidia AI denoiser only works on Nvidia Maxwell and newer GPU architectures.
Intel Open Image Denoise – V-Ray's integration of Intel Open Image Denoise. The Intel Open Image Denoise works with your CPU device and does not use hardware acceleration.
Mode – Specifies how the results of the Denoiser are saved.
Only generate render elements – All render elements required for denoising are generated, but a denoised version of the image is not computed, and the VRayDenoiser render element is not present.
Hide denoiser result channel – The VRayDenoiser channel is not present separately in the VFB. The effectsResult channel is generated with the denoised image.
Show denoiser result channel – The VRayDenoiser and effectsResult channels are generated.
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. This parameter is available only 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.
Update – Reapply the denoising operation when the required render elements are already present in the V-Ray frame buffer. Use this button to apply denoising again after settings in this rollout have been changed.
