An example of rotation about the X axis.

Please use a browser that supports "canvas"
-180 180 X angle : 0.0

Translate the model away from the origin:
-1.0 1.0 tx : 0.00
-1.0 1.0 ty : 0.00
-1.0 1.0 tz : 0.00

Notice that when the model is centered at the origin (or anywhere on the x axis) the model changes orientation but does not change location. If you move the model away from the x axis, both its orientation and its location change.