D3DXPlaneDot

Computes the dot product of a plane and a 4D vector.

FLOAT D3DXPlaneDot(
  CONST D3DXPLANE * pP,
  CONST D3DXVECTOR4 * pV
);

Parameters

pP

[in] Pointer to a source D3DXPLANE structure.

pV

[in] Pointer to a D3DXVECTOR4 structure.

Return Values

The dot product of the plane and 4D vector.

Remarks

Given a plane (a, b, c, d) and a 4D vector (x, y, z, w) the return value of this function is a*x + b*y + c*z + d*w. The D3DXPlaneDot function is useful for determining the plane's relationship with a homogeneous coordinate. For example, this function could be used to determine if a particular coordinate is on a particular plane, or on which side of a particular plane a particular coordinate lies.

Requirements

Header: Declared in D3dx9math.h.

See Also

D3DXPlaneDotCoord, D3DXPlaneDotNormal