ebassi/graphene — pull request #15 by alexlarsson (2014-10-20 12:40:10+00:00)
Title: Fix graphene_quaternion_init_from_angles calculations

This was just wrong (did not even set z!)
This implementation is the same as the one in three.js:

https://github.com/mrdoob/three.js/blob/master/src/math/Quaternion.js#L119