A model may have more than one material applied to it when you import it from a 3D modeling software, such as Autodesk Maya® or Autodesk 3ds max®. In MotionBuilder, these materials are listed in the Scene browser and are attached to the model.
The different materials were assigned to different regions of polygons, instead of to the entire model. These regions are set in the 3D modeling software and cannot be altered using MotionBuilder.
In Autodesk 3ds max, these polygon regions are called material IDs, and the material that uses them is called the Multi/Sub-Object material.
MotionBuilder includes all the materials imported with the model, and assumes that material has a corresponding polygon region on the model. The model may in fact have more or less regions than the number of materials attached to it suggest. For example, if a model of a soccer ball has two regions, one for a black material and one for a white material, the model can be imported with more than two materials attached to it. In this case, where there are more materials than polygon regions, the first materials listed in the Scene browser are used, and the rest are ignored.
You can modify, replace, or delete materials applied to model regions. See Applying a material to a region.
