D3DXPlaneDotNormal function

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

Syntax

FLOAT D3DXPlaneDotNormal(
  _In_ const D3DXPLANE   *pP,
  _In_ const D3DXVECTOR3 *pV
);

Parameters

pP [in]

Type: const D3DXPLANE*

Pointer to a source D3DXPLANE structure.

pV [in]

Type: const D3DXVECTOR3*

Pointer to a source D3DXVECTOR3 structure.

Return value

Type: FLOAT

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

Requirement Value
Header
D3dx9math.h
Library
D3dx9.lib

See also

Math Functions

D3DXPlaneDot

D3DXPlaneDotCoord