Add child data to the frame.
HRESULT AddFrameChildData( CONST D3DXFRAME * pFrame, LPD3DXFILESAVEOBJECT pXofSave, LPD3DXFileSaveData pXofFrameData );
The return values of this method are implemented by an application programmer. In general, if no error occurs, program the method to return D3D_OK. Otherwise, program the method to return an appropriate error message from D3DERR or D3DXERR, as this will cause D3DXLoadMeshHierarchyFromX to fail also, and return the error.
ID3DXSaveUserData::RegisterTemplates and ID3DXSaveUserData::SaveTemplates provide a mechanism for adding a template to a .x file for saving user data.
Header: Declared in D3dx9anim.h.