public _3D(int globalSizeX, int globalSizeY, int globalSizeZ, int localSizeX = 1, int localSizeY = 1, int localSizeZ = 1) { _globalIDs = new IDs_3D(globalSizeX, globalSizeY, globalSizeZ); _localIDs = new IDs_3D(localSizeX, localSizeY, localSizeZ); }