public static void IntersectPlane(out XMVector linePoint1, out XMVector linePoint2, XMVector p1, XMVector p2)
{
XMVector v1 = XMVector3.Cross(p2, p1);
XMVector lengthSq = XMVector3.LengthSquare(v1);
XMVector v2 = XMVector3.Cross(p2, v1);
XMVector p1W = XMVector.SplatW(p1);
XMVector point = XMVector.Multiply(v2, p1W);
XMVector v3 = XMVector3.Cross(v1, p1);
XMVector p2W = XMVector.SplatW(p2);
point = XMVector.MultiplyAdd(v3, p2W, point);
XMVector lineP1 = XMVector.Divide(point, lengthSq);
XMVector lineP2 = XMVector.Add(lineP1, v1);
XMVector control = XMVector.LessOrEqual(lengthSq, XMGlobalConstants.Epsilon);
linePoint1 = XMVector.Select(lineP1, XMGlobalConstants.QNaN, control);
linePoint2 = XMVector.Select(lineP2, XMGlobalConstants.QNaN, control);
}
public static XMVector ClampLengthV(XMVector v, XMVector lengthMin, XMVector lengthMax)
{
Debug.Assert(lengthMin.Y == lengthMin.X && lengthMin.Z == lengthMin.X, "Reviewed");
Debug.Assert(lengthMax.Y == lengthMax.X && lengthMax.Z == lengthMax.X, "Reviewed");
Debug.Assert(XMVector3.GreaterOrEqual(lengthMin, XMGlobalConstants.Zero), "Reviewed");
Debug.Assert(XMVector3.GreaterOrEqual(lengthMax, XMGlobalConstants.Zero), "Reviewed");
Debug.Assert(XMVector3.GreaterOrEqual(lengthMax, lengthMin), "Reviewed");
XMVector lengthSq = XMVector3.LengthSquare(v);
XMVector zero = XMVector.Zero;
XMVector reciprocalLength = lengthSq.ReciprocalSqrt();
XMVector infiniteLength = XMVector.EqualInt(lengthSq, XMGlobalConstants.Infinity);
XMVector zeroLength = XMVector.EqualInt(lengthSq, zero);
XMVector normal = XMVector.Multiply(v, reciprocalLength);
XMVector length = XMVector.Multiply(lengthSq, reciprocalLength);
XMVector select = XMVector.EqualInt(infiniteLength, zeroLength);
length = XMVector.Select(lengthSq, length, select);
normal = XMVector.Select(lengthSq, normal, select);
XMVector controlMax = XMVector.Greater(length, lengthMax);
XMVector controlMin = XMVector.Less(length, lengthMin);
XMVector clampLength = XMVector.Select(length, lengthMax, controlMax);
clampLength = XMVector.Select(clampLength, lengthMin, controlMin);
XMVector result = XMVector.Multiply(normal, clampLength);
// Preserve the original vector (with no precision loss) if the length falls within the given range
XMVector control = XMVector.EqualInt(controlMax, controlMin);
result = XMVector.Select(result, v, control);
return(result);
}
public static XMVector LinePointDistance(XMVector linePoint1, XMVector linePoint2, XMVector point)
{
//// Given a vector PointVector from LinePoint1 to Point and a vector
//// LineVector from LinePoint1 to LinePoint2, the scaled distance
//// PointProjectionScale from LinePoint1 to the perpendicular projection
//// of PointVector onto the line is defined as:
////
//// PointProjectionScale = dot(PointVector, LineVector) / LengthSq(LineVector)
XMVector pointVector = XMVector.Subtract(point, linePoint1);
XMVector lineVector = XMVector.Subtract(linePoint2, linePoint1);
XMVector lengthSq = XMVector3.LengthSquare(lineVector);
XMVector pointProjectionScale = XMVector3.Dot(pointVector, lineVector);
pointProjectionScale = XMVector.Divide(pointProjectionScale, lengthSq);
XMVector distanceVector = XMVector.Multiply(lineVector, pointProjectionScale);
distanceVector = XMVector.Subtract(pointVector, distanceVector);
return(XMVector3.Length(distanceVector));
}
public static XMVector Length(XMVector v)
{
return(XMVector3
.LengthSquare(v)
.Sqrt());
}
public static XMVector ReciprocalLength(XMVector v)
{
return(XMVector3
.LengthSquare(v)
.ReciprocalSqrt());
}
