Free 3dsMax Script – Multimaterial from files v1.0 | Spline Dynamics
The script lets you pick multiple image files from your drive and creates one material per file, with the image assigned as diffuse texture, and builds a multimaterial with all of them. Then assigns the multimaterial to the selected objects.
* It optionally adds a Material Modifier to the object/s so you easily visualize or animate the textures on them.
* 6 material types supported for submaterials (from several render engines): Physical material, Arnold Standard Surface, VRay material, Corona material, FStorm, Standard material.