Material Assignments, Methods, Collection-Based Binding

2. Collection-Based Binding:

- Collection-based binding allows you to assign a material to a collection of prims, which is useful for managing material assignments across multiple prims efficiently.

- This method uses UsdCollectionAPI to define collections of prims and then binds materials to these collections.

- Example:

    
     from pxr import Usd, UsdShade, UsdCollection

     stage = Usd.Stage.Open("path/to/your.usda")
     collection = UsdCollection.CollectionAPI.Apply(stage.GetPrimAtPath("/path/to/collection"))
     collection.CreateIncludesRel().AddTarget("/path/to/prim1")
     collection.CreateIncludesRel().AddTarget("/path/to/prim2")
     material = UsdShade.Material.Define(stage, "/path/to/material")
     UsdShade.MaterialBindingAPI(stage.GetPrimAtPath("/path/to/collection")).Bind(collection, material)
     ```