IE cubic problem

Hello there,

I'm trying to make a cube with the slides. Here is the source code https://gist.github.com/anonymous/414ae6b8e8a562cbcd87beeb86f7a0e2

It works perfectly on chrome firefox and safari. But with IE 11, all rotated steps are invisibles.

Do you have any idea to solve this?
Thanks by advance.

Start by reproducing the cube from the linked Gist in IE 11 and compare it with Chrome, Firefox, and Safari. Trace the rotated steps in the impress.js presentation and identify why they become invisible; done means the cube renders all rotated steps correctly in IE 11 without breaking the other browsers.

Written by the indexing model from the issue text.