select color of material in VrayMtlID?

V-Ray V-Ray for 3ds Max General
1

Is there a way to select the color of the various material id’s for the VrayMtlID render element ouput?

2

Hello,

Currently there is no option for this. Each ID is storing an integer value within a EXR file, or vrimg. I will attach an image showing the colors for all material IDs.
As a workaround you can use a VRayExtraTex render element with VRayMultiSubTex to create a mask, but here you have to specify an object ID for each object, or you can use the other modes of the VRayMultiSubTex. Also you will have antialiasing.
http://ftp.chaosgroup.com/support/screenshots/3dsmax\_2019-04-15\_16-30-29.jpg