public unsafe void Split(BoundingBox2D* childBoxes, ref IMy2DClipmapNodeHandler[] children)
        {
            m_split = true;

            for (int i = 0; i < 4; ++i)
                children[i].Init(m_manager, (Coords.X << 1) + (i & 1), (Coords.Y << 1) + ((i >> 1) & 1), Lod - 1, ref childBoxes[i]);

            if (EnvironmentSector != null) // if we have so do our children.
            {
                for (int i = 0; i < 4; ++i)
                {
                    m_children[i] = (MyPlanetEnvironmentClipmapProxy)children[i];
                    m_children[i].m_parent = this;
                }
            }
        }
        public void InitJoin(IMy2DClipmapNodeHandler[] children)
        {
            m_split = false;
            m_closed = false;

            if (EnvironmentSector != null)
            {
                m_manager.UnmarkProxyOutgoingProxy(this);
                m_manager.EnqueueOperation(this, Lod);
                LodSet = Lod;

                for (int i = 0; i < 4; ++i)
                    m_children[i] = null;
            }
            else
            {
                m_manager.RegisterProxy(this);
            }
        }