XMPlaneDotCoord method
Calculates the dot product between an input plane and a 3D vector.
Syntax
XMVECTOR XMPlaneDotCoord( [in] XMVECTOR P, [in] XMVECTOR V );
Parameters
- P [in]
-
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 [in]
-
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
Microsoft Visual Studio 2010 or Microsoft Visual Studio 2012 with the Windows SDK for Windows 8. Supported for Win32 desktop apps, Windows Store apps, and Windows Phone 8 apps.
Requirements
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See also