IDirect3DLight Interface Method Groups
Applications use the methods of the IDirect3DLight interface to retrieve and set the capabilities of lights. The methods can be organized into the following groups:
Get and set GetLight
Initialization Initialize
IUnknown AddRef
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 Direct3DLight object without affecting the functionality of the original interface.