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changes.mady.by.user Kristina Gaytandzhieva

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Cryptomatte is a method developed by Psyop 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.

Compared to 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.
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With V-Ray 5, update 2, the Cryptomatte Render Element works with the Progressive Image Sampler type as well.

 

 

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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