Describes a vector in 4D space.
typedef struct D3DXVECTOR4 { FLOAT x; FLOAT y; FLOAT z; FLOAT w; } D3DXVECTOR4, *LPD3DXVECTOR4;
C++ programmers can take advantage of operator overloading and type casting with the D3DXVECTOR4 Extensions, which implement overloaded constructors, assignment, unary, and binary (including equality) operators.