Сравнение интерполяции углов Эйлера и кватернионов на Unity3d
http://habrahabr.ru/post/183908/
WebGL http://basmanovdaniil.github.io/Quaternions
Windows https://github.com/BasmanovDaniil/Quaternions/releases/download/2.0/Quaternions.Windows.zip
Linux https://github.com/BasmanovDaniil/Quaternions/releases/download/2.0/Quaternions.Linux.zip
Mac https://github.com/BasmanovDaniil/Quaternions/releases/download/2.0/Quaternions.Mac.zip