Energy-Based Visualization of 2D Flow Fields - Karsten Hanser; Stefan Meggendorfer; Peter Hügel; Florian Fallenbüchel; Hafiz Muhammad Fahad; Filip Sadlo (Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, VISIGRAPP 2019, Volume 3: IVAPP, Prague, Czech Republic, February 25-27, 2019, 2019)