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The Material ID Render Element provides a mask for individual objects and materials that is easy to select in compositing software.

This render element shows solid unshaded color masks based on the selected Material ID color values that can be set using the Material ID Extra V-Ray Attributes.UI Path: ||out Network|| > V-Ray Render Elements node> V-Ray > Render Channel >  V-Ray Color Channel (RE) > Type > Material ID

The parameters for this render element appear in the V-Ray RenderChannelColor render channels node.

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

Color Mapping – When enabled, the Color Mapping options in the render settings are applied to the current render channel.

Consider For AA – When enabled, anti-aliasing is used where possible.

Filtering – Applies the image filter to this channel. Image filter settings are in the Image Sampler tab of the Sampler tab of the V-Ray Renderer node.

Denoise – Enables the render element's denoising, provided the V-Ray Denoiser render element is present.

Derive Raw Channels – Generates data in the raw channels by combining the respective color and the filter color channels.

VFB Color Corrections – Applies the post render color adjustments made from the VFB.