vispy/vispy — pull request #409 by rossant (2014-08-17 16:44:26+00:00)
Title: Real-time GPU-based ray tracing example

Entirely implemented in the fragment shader.

![image](https://cloud.githubusercontent.com/assets/1942359/3945096/14128750-262d-11e4-9219-98faf08bdd64.png)

Ready for review/merge.