A modified version of Celestia (http://www.shatters.net/celestia/), based on version 1.6.1, to visualize 3D nebulae created by Wenger et.al (http://www.cg.cs.tu-bs.de/publications/wenger2012visualization/#models). I did this for my bachelor thesis (http://elib.uni-stuttgart.de/opus/volltexte/2012/7980/pdf/BCLR_0005.pdf).