public static XYZ GetProjectPoint(Plane plane, XYZ point)
{
double d = GetSignedDistance(plane, point);
XYZ q = GeomUtil.AddXYZ(point, GeomUtil.MultiplyVector(plane.Normal, d));
return(IsPointInPlane(plane, q) ? q : GeomUtil.AddXYZ(point, GeomUtil.MultiplyVector(plane.Normal, -d)));
}