Normalizes the plane coefficients so that the plane normal has unit length.
D3DXPLANE * D3DXPlaneNormalize( D3DXPLANE * pOut, CONST D3DXPLANE * pP );
Pointer to a D3DXPLANE structure that represents the normal of the plane.
This function normalizes a plane so that |a,b,c| == 1.
The return value for this function is the same value returned in the pOut parameter. In this way, this function can be used as a parameter for another function.
Header: Declared in D3dx9math.h.