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The Multi Matte ID Render Element provides a mask for individual objects and/or materials, based on the Multi Matte IDs that have been added as Extra V-Ray Attributes.

The Multi Matte ID Render Element contains no shading information at all, and only contains blocks of color that correspond to each Multi Matte ID . It uses the Multi Matte ID set when the Material ID attribute is added to a material.

 

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titleUI Path: ||Display Render Settings button|| > Render Elements tab > Multi Matte ID
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To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu.

For more information on the parameters on this dialog, see the Render Elements tab page.

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Here's the workflow for setting up and using the Multi Matte ID Render Element:

 

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 Add
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  • Select the material in the Hypershade that a Multi Matte ID Render Element is needed for.
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  • Add the Material ID

attribute 
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 Set

  • attribute from Attributes > VRay > Material ID.

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 Open Render

  • Set the Multi Matte ID to the required value. Note: each number corresponds to a different color.

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  • Open the Render Settings and go to the Render Elements tab and from

the Available

  • the Available render elements add a Multi Matte ID render element.

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Common Uses

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A typical usage of this render element, is to use the colors produced in the Multi Matte ID to produce a mask or alpha channel in post production that covers everything with that Multi Matte ID.

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