I like to fool around with Blender, the 3D modeling and animation software. For the most part, in Blender you have to create your own content by sculpting and painting things from scratch. But what if you have a bunch of scientific data that you want to visualize? Evidently you can use VTK and other computer programs that are built upon it. I haven’t used VTK myself but it seems to be widely used in the scientific community.
The Visualization Toolkit (VTK) is an open source graphics toolkit. It is a platform independent graphics engine with parallel rendering support. VTK has an active development community that includes laboratories, institutions and universities from around the world. VTK has several large collaborations between Kitware and national organizations such as Sandia National Labs, Los Alamos, and Livermore National Labs, who are using VTK as the foundation for their large data visualization research efforts. – Wikipedia.org