public void Begin(MyVoxelMap voxelMap, ref MyMwcVector3Int cellCoord)
 {
     VoxelMap  = voxelMap;
     CellCoord = cellCoord;
     Center    = voxelMap.GetRenderCellCenterPositionAbsolute(ref cellCoord);
     Contains  = true;
     MyVoxelCacheCellRenderHelper.Begin();
 }