OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › How to create complex 2D geometry stucture › Reply To: How to create complex 2D geometry stucture November 11, 2021 at 10:41 pm #6169 AdrianKeymaster The cuboid indicator setup looks ok. You’ll just have to call the super geometry’s rename method to actually set the material numbers (not shown in the code snippet).