This page provides information on the Denoiser rollout in the Render Elements.

 

Page Contents

 

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.

Because the V-Ray Denoiser operates on other render elements rather than being part of the rendering process itself, the denoising operation does not require rerendering of the scene. The Denoiser settings can be quickly changed and tested over and over to improve the result.

Currently the scene can contain only one VRayDenoiser Render Element. Future versions of V-Ray will support multiple VRayDenoiser Render Elements with different settings.

 


 

UI Path: ||V-Ray Asset Editor|| > Render Settings > Render Elements > Denoiser (when Denoiser is added as a Render Element)

 

 

Parameters


 

 

 

Effects Update Frequency – Controls the regularity of updates during the progressive rendering. Roughly this specifies the percentage of the total render time that is allotted to denoising. Zero disables updates during the progressive rendering; larger values cause the denoiser to be updated more frequently; 100 will cause updates as often as possible. Values ranging from 5 to 10 are usually sufficient.

Enable – Turns the Denoiser on or off.

Preset – Offers presets to automatically set the strength and radius values. For more information, see the Denoising Presets example below.

Mild – Applies a more subtle level of denoising than the Default preset.
Default
 – Applies a mid-level denoising.
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 will be.

Radius – Specifies the area around each pixel to be denoised. A smaller radius will affect a smaller range of pixels. A larger radius will affect a larger range, which will increase the noise removal.

Type – Specifies whether to denoise only the RGB Color Render Element, or others as well.

Single pass denoise on RGB only – Does a single pass at denoising on only the RGB Color Render Element, using other elements like the Diffuse Render Element only to guide the denoising process. This method is better at cleaning up noise, but might lose small texture details or add too much blur to areas of the image where multiple effects are visible at the same time (such as reflections and refractions through glass materials). 
Denoise render elements separately – Denoises the lighting, global illumination, specular, reflection, refraction and atmosphere render elements separately and combines them into one denoised version of the RGB image. This method preserves texture details better, but might fail to clean up some types of noise when low settings are used. 

Update button - Click to regenerate the denoiser channel without having to re-render the scene.

 

 


 

Example: Denoising Presets

 

The example below illustrates how VRayDenoiser works using the presets. A purposely noisy render was set up using the Progressive Image Sampler Type with Render Time set to only 3 minutes to leave plenty of noise in the render. To better see the noise level in each image, click the image to see it at full size.

 

 

RGB Color Render Element prior to denoising


VRayDenoiser Render Element (Mild Preset)

 

 
 


VRayDenoiser Render Element (Default Preset)

 


VRayDenoiser Render Element (Strong Preset)

 

 
 


VRayDenoiser Render Element
(Custom Preset: strength: 5, radius: 10)

 


The VRayDenoiser Render Element
(Custom Preset: strength:10, radius: 20)

 

 





Example: noiseLevel Render Element


The noiseLevel Render Element shows where areas of noise have been detected in the scene. White areas have the most noise, black areas have no noise, and gray areas have varying levels of noise.

 

 

RGB Color Render Element prior to denoising
Note: Areas around the microwave oven have high-contrast noise.

 

noiseLevel Render Element

 


Denoised RGB Color Render Element

 

 

 


 

Notes


  • Image denoising takes place after the frame has been rendered and will not show up until all rendering has finished.

  • Textures or materials that have a purposely noisy look will not be considered "noisy" by the Denoiser. They will not be affected by the noise removal process.