MatLibMulti for 3dsmax 2021+

Installation:

1) copy the contents of the folder to: Documents\3ds Max 2022\materiallibraries
2) open 3ds max go to the Slate Material Editor (hotkey-m) and download the Clay.mat library (Open Material Library) from Documents\3ds Max 2022\materiallibraries
3) install the script MatLibMulti.ms (drag to the max window or Scripting>Run Script)

Using:

LMB - Clay2side
LMB+shift - MatCap_1
LMB+ctrl - MatCap_2
LMB+alt - MatCap_3
LMB+shift+ctrl - MatCap_4
LMB+shift+alt - White
LMB+shift+ctrl - Black
LMB+shift+ctrl+alt - Transparent