Using flow lines is a natural way to visualize time-varying flow fields. In this work, a powerful algorithm for generating stream, path and streak lines on programmable graphics hardware is presented. The algorithm generates very accurate lines by supporting adaptive resolution even for streak lines. Nicodemus Cuntz, Albert Pritzkau, Andreas Kolb: Time- Adaptive Lines for the Interactive Visualization of Unsteady Flow Data Sets, in: Computer Graphics Forum, 2009