I drew a simple Bezier curve and Sweep'ed (swept?) a square around it. And I'd like to twist this square tube:
According to the HUD hints, I Shift+LMB an anchor point. Now it shows two different kinds of handles: A white circle around it, and a full rotation handle with X/Y/Z axes.
It's a bit confusing to me tho. As far as I know, the only meaningful way to "orient" an anchor point on a Bezier curve is to rotate around its Z axis. In other word, the white circle is all I can do. Why does it show the full rotation handle?
I guess that the X Y Z handles simply provide another way for you to manipulate the orientation. The actul impact occurs when the white handle changes in response to the adjustment made by the XYZ handles.