public static XMVector Normalize(XMVector v)
{
XMVector result = XMVector2.Length(v);
float length = result.X;
// Prevent divide by zero
if (length > 0)
{
length = 1.0f / length;
}
result.X = v.X * length;
result.Y = v.Y * length;
result.Z = v.Z * length;
result.W = v.W * length;
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 = XMVector2.LengthSquare(lineVector);
XMVector pointProjectionScale = XMVector2.Dot(pointVector, lineVector);
pointProjectionScale = XMVector.Divide(pointProjectionScale, lengthSq);
XMVector distanceVector = XMVector.Multiply(lineVector, pointProjectionScale);
distanceVector = XMVector.Subtract(pointVector, distanceVector);
return(XMVector2.Length(distanceVector));
}