sympy/sympy — pull request #7626 by debugger22 (2014-06-22 15:57:11+00:00)
Title: WIP: Calculate transmitted vector after refraction

**ToDo**

- [ ] Make it work with 3D Rays(yet to merge https://github.com/sympy/sympy/pull/7554)
- [ ] Write docstings
- [ ] Write Tests