Matilda is a tool for creating and modifying DMLs (Dynamix Material Lists), which are used by the TRIBES engine as well as other tools such as ZED. A DML is basically an ordered listing of textures; ZED uses a DML to apply textures via indices to a shape. As well as assigning textures to "slots", Matilda also allows you to assign preset physical attributes to a texture, which will let TRIBES know to treat any surface
