[mP] MtlMapParams¶
[mP] MtlMapParams– 1 per pass, sub name required, Custom Property, Preset¶
allow you control almost all parameters of a material or map per pass. If a parameter is exposed to Maxscript, you can control it.

You can choose a material/map using the top button. Clicking the button will open up a menu. If you selected objects and the first selected object has material, it will allow to grab the material on the object.
Warning
Keep in mind, unlike Material pmodifier, this pmodifier DOESN’T store a backup copy of material/map. Therefore, if the material/map doesn’t exist in the scene. This modifier will lose the material/map. It might be a good idea to put a copy of the material/map in a tab of Slate ME.
After you choose a material/map, you can add the properties you want to control. Please check here for the details.