D3DXPlaneDotCoord

Computes the dot-product of a plane and a 3-D vector. The w parameter of the vector is assumed to be 1.

FLOAT D3DXPlaneDotCoord(
  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 3-D vector.

Remarks

Given a plane (a, b, c, d) and a 3-D vector (x, y, z) the return value of this function is a*x + b*y + c*z + d*1. The D3DXPlaneDotCoord function is useful for determining the plane's relationship with a coordinate in 3-D space.

Requirements

  Header: Declared in D3dx8math.h.
  Import Library: Use D3dx8.lib.

See Also

D3DXPlaneDot, D3DXPlaneDotNormal