IDirect3DMaterial Interface Method Groups
Applications use the methods of the IDirect3DMaterial interface to retrieve and set the properties of materials. The methods can be organized into the following groups:
Color reservation Reserve
IUnknown AddRef
Materials GetMaterial
Miscellaneous GetHandle
All COM interfaces inherit the IUnknown interface methods, which are listed in the "IUnknown" group above. These three methods allow additional interfaces to be added to the Direct3DMaterial object without affecting the functionality of the original interface.