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The Multi Matte ID Render Element isolates objects with specific Multi Matte IDs for compositing purposes.

Overview

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.

V-Ray for Maya > Multi Matte ID > maya2016_34004_multimatteID.png

UI Path

||Render Settings window|| > Render Elements tab > Multi Matte ID

Attributes

The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.

Enabled – When enabled, the render element appears in the V-Ray frame buffer.

Deep output – Specifies whether to include this render element in deep images.

Filename suffix – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.multimatteID.vrimg).

This render element is not supported with V-Ray GPU rendering.

Multimatte ID Render Element Set up Procedure

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

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

Add the Material ID attribute Attributes > VRay > Material ID.

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

Open Render Settings and go to the Render Elements tab and from the Available render elements add a Multi Matte ID render element.

Common Uses

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.

V-Ray for Maya > Multi Matte ID > VRay_Maya_RenderElements_CommonUses_Beauty_Render.png
The Beauty Render Element

V-Ray for Maya > Multi Matte ID > VRay_Maya_RenderElements_CommonUses_MultiMatteID_RE.png
The Multi Matte ID Render Element

V-Ray for Maya > Multi Matte ID > VRay_Maya_RenderElements_CommonUses_MultiMatteID_Matte_RE.png
The Alpha Matte produced from the red channel of the Multi Matte ID render element

V-Ray for Maya > Multi Matte ID > VRay_Maya_RenderElements_CommonUses_MultiMatteID_Reflect_RE.png
Reflection Render Element prior to grading using a matte created from the red channel of the Multi Matte ID Render Element

V-Ray for Maya > Multi Matte ID > VRay_Maya_RenderElements_CommonUses_MultiMatteID_Reflect_matteGrade_RE.png
The Reflection Render Element using a matte created from the red channel of the Multi Matte ID Render Element to add contrast to the reflection on the suit and tint it blue

V-Ray for Maya > Multi Matte ID > VRay_Maya_RenderElements_CommonUses_Beauty_MultiMatte_ID_Render.png
The resulting composite using the Multi Matte ID's
for Control changing material colors without re-rendering