private TGCPlane SelectPlane(List <TGCPlane> planes, TGCVector3 testPoint)
{
GlobalConcepts g = GlobalConcepts.GetInstance();
planes.Sort((x, y) => g.IsInFrontOf(testPoint, x).CompareTo(g.IsInFrontOf(testPoint, y)));
planes.Reverse();
return(planes[0]);
}