This page gives information on the Material Select Render Element.
||Render Setup window|| > Render Elements tab > Add button > VRayMtlSelect
This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
vrayVFB – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.
deep output – Specifies whether to include this render element in deep images.
color mapping – Applies the color mapping options specified in the Color mapping rollout of the V-Ray tab in the Render Setup window to this render element. This option is disabled by default.
multiplier – Sets the overall intensity of the render element, where 1.0 is the standard multiplier.
material – Click the button to select the material to represent as white in this element, or drag the material from the Material Editor onto this slot. You may also drag the output socket from the Slate Material Editor to this slot to connect it to the render element.
The Material Select Render Element is useful for isolating geometry in a scene based on the selected material. In the examples shown, the window frame material was selected.