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This page provides information about the Cryptomatte render element in V-Ray for SketchUp. 

 


Overview

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Cryptomatte is a method developed by by Psyop for for efficiently encoding accurate mattes. It typically uses three to five automatically generated render channels stored in a multichannel OpenEXR file which removes the hassle of creating dozens or hundreds of Multimattes. .

The Cryptomatte render element works with both Progressive and Bucket Image Sampler.

Compared to the Multimatte the Multimatte Render Elements, Cryptomatte offers the following:

Fancy Bullets
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  • Does not require a setup with object IDs, etc.
  • Only requires a fixed number of additional render elements, typically four.Cannot be propagated through reflections or refractions
UI Text Box
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In V-Ray 7 and later, you can create multiple Cryptomatte render elements in your scene.

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UI Text Box

Currently, Cryptomatte render element works only with the Bucket Image Sampler (Progressive switched off).

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UI Path

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||V-Ray Asset Editor|| > Render Elements (right-click) > Cryptomatte
||V-Ray Asset Editor||

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> Create Asset (left-click) > Render Elements > Cryptomatte



Parameters

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ID Type – Specifies how the ID mattes are created.

Object Name – Creates mattes based on object names. Note that object IDs are used in case no scene name is specified.
Material Name – Creates mattes based on the materials in the scene.
Object Name with Hierarchy – Creates mattes by object names with full scene hierarchy path.
Layer Names – Creates mattes based on the layer names the object belongs to.

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Common Use

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After producing a multichannel exr image with the Cryptomatte layer, we can use it in a compositing application, such as Nuke, to color correct the image. This example shows the before and after color correcting.

 
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