OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › IndicatorCuboid2D : Need extra Explanation › Reply To: IndicatorCuboid2D : Need extra Explanation December 17, 2020 at 8:47 pm #5413 at8iParticipant The first part of the question is not clear: I do not know what origin does. What is it exactly indicating?