public void SplitByPlane(Plane plane)
{
plane.Distance = -math.dot(plane.Normal, MassProperties.CenterOfMass);
ConvexHullBuilder neg, pos;
Hull.SplitByPlane(plane, out neg, out pos, 0);
Hull.CopyFrom(pos);
neg.Dispose();
pos.Dispose();
UpdateMesh = true;
}