Problem with .rotateZ()

[bneigher]

Hey! Nice library.

I took one of your examples and made a reusable library out of it.

It takes a bunch of [x,y,z] coordinates, and optionally a base coordinate and renders the points in 3d space. Clone It!

I am trying have the graph animate a rotation about the Z axis -- however it seems that whenever I do that -- the data gets warped! I believe there may be an issue with how the rotateZ() method works on shapes.

I have a TODO in the animate method of the main class -- if you comment that in you can see the output. Any ideas what may be causing this?