D3DXPlaneDotNormal

Computes the dot product of a plane and a 3D vector. The w parameter of the vector is assumed to be 0.

FLOAT D3DXPlaneDotNormal(
  CONST D3DXPLANE * pP,
  CONST D3DXVECTOR3 * pV
);

Parameters

pP

[in] Pointer to a source D3DXPLANE structure.

pV

[in] Pointer to a source D3DXVECTOR3 structure.

Return Values

The dot product of the plane and 3D vector.

Remarks

Given a plane (a, b, c, d) and a 3D vector (x, y, z) the return value of this function is a*x + b*y + c*z + d*0. The D3DXPlaneDotNormal function is useful for calculating the angle between the normal of the plane, and another normal.

Requirements

Header: Declared in D3dx9math.h.

See Also

D3DXPlaneDot, D3DXPlaneDotCoord