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This page provides information about V-Ray's standalone Denoise Tool.

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The V-Ray installation with 3ds Max, Maya, and Modo includes a standalone denoising tool called vdenoise that can be used to denoise still images or animations outside of the V-Ray host application. This is especially useful for animations because the standalone tool can look at multiple frames at once and produce a better denoising result. The vdenoise tool works with either .vrimg or multichannel OpenEXR files and writes out files with the same format.

The vdenoise tool requires certain render elements in order to work correctly. These render elements can be generated easily with the VRayDenoiser Render Element.



The vdenoise tool can normally be found in the tools or bin folders located under C:\Program Files\Chaos Group\V-Ray\[host_application]. You can quickly open a command prompt in the folder where the vdenoise tool is located from Start Menu > Programs > Chaos Group > [Host Application] > Tools > Denoiser tool.


Denoising Still Images

To denoise a single .vrimg or .exr image, use the following format for the command:

vdenoise -inputFile="path\to\image.ext"

where path\to\image.ext is the path and file name of the .vrimg or .exr file that you want to denoise.

For example, if the file you want to denoise is called render.exr and is located in the folder c:\renderoutput, the full command will be

vdenoise -inputFile="c:\renderoutput\render.exr"


Denoising Animations

To denoise a sequence of images, you must have all frames already rendered, as the denoiser needs to look at several frames at the same time. Use the following format for the command:

vdenoise -inputFile="path\to\sequence_????.ext"

where the question mark (?) replaces the digits in the sequence's file names.

For example, if the images in the sequence are named anim_0001.exr, anim_0002.exr, etc. and are located in the folder c:\renderoutput, the full command will be

vdenoise -inputFile="c:\renderoutput\anim_????.exr"


Additional Options for the Denoiser

You can control the denoiser through additional options on the command line. Run the denoiser without any arguments or use the -help command-line switch to list all available options.