XMPlaneDotCoord

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

Syntax

XMVECTOR XMPlaneDotCoord(
         XMVECTOR P,
         XMVECTOR V
)  

Parameters

P
Type: XMVECTOR 

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;  

.

V
Type: XMVECTOR 

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

Return value

Type: XMVECTOR 

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

Requirements

Header: Declared in directxmath.h.