XMPlaneDotCoord function (directxmath.h)

Calculates the dot product between an input plane and a 3D vector.

Syntax

XMVECTOR XM_CALLCONV XMPlaneDotCoord(
  [in] FXMVECTOR P,
  [in] FXMVECTOR V
) noexcept;

Parameters

[in] P

XMVECTOR describing the plane coefficients (A, B, C, D) for the plane equation

XMVECTOR vectorOut;

vectorOut.x = P.x * V.x + P.y * V.y + P.z * V.z + P.w * 1.0f;
vectorOut.y = P.x * V.x + P.y * V.y + P.z * V.z + P.w * 1.0f;
vectorOut.z = P.x * V.x + P.y * V.y + P.z * V.z + P.w * 1.0f;
vectorOut.w = P.x * V.x + P.y * V.y + P.z * V.z + P.w * 1.0f;

return vectorOut;

.

[in] V

3D vector to use in the dot product. The w component of V is always treated as if is 1.0f.

Return value

Returns the dot product between P and V replicated into each of the four components of the returned XMVECTOR.

Remarks

This function can be useful in finding the signed distance from a point to a plane. The following pseudocode demonstrates the operation of the function.

Ax+By+Cz+D=0

Platform Requirements

Requirements

See also

DirectXMath Library Plane Functions