D3DXVec4Dot
    Determines the dot product of two 4D vectors.
            
		
        
FLOAT D3DXVec4Dot(
  CONST D3DXVECTOR4 * pV1,
  CONST D3DXVECTOR4 * pV2
);
    
Parameters
      - pV1
- [in]  Pointer to a source D3DXVECTOR4 structure.
- pV2
- [in]  Pointer to a source D3DXVECTOR4 structure.
Return Values
The dot product.
Requirements
  Header: Declared in D3dx9math.h.
					
See Also
D3DXVec4Cross