Where can I find this command?
The Twist command deforms objects by rotating them around an axis.
指令行選項
Copy
The Copy option specifies whether or not the objects are copied. A plus sign 
appears at the cursor when copy mode is on.
Note: The RememberCopyOptions command determines whether the selected option is used as the default.
硬性
The Rigid option specifies that individual objects will not be deformed as they are transformed.
The illustration shows the Rigid option with the Bend command.
Original objects (left), Rigid=No (center), Rigid=Yes (left).
是
Individual objects will not change, only their positions will change.
No
Individual objects are transformed as well as their positions.
Infinite=Yes/No
If Yes, the deformation is constant throughout the object, even if the axis is shorter than the object.
If No, the twisting is not constant throughout the object. The deformation takes place only the length of the axis. The length of the axis is important. If the axis is shorter than the object, the twist applies only to that part of the object. In addition, the twist blends in and out at the ends of the axis.
Infinite=Yes (left); Infinite=No (right).
維持結構
The PreserveStructure option specifies whether the control-point structure of a curve or surface will be maintained after the deformation.
是
The control point structure of the surface is maintained. Deformation may be less accurate if there are too few control points in on the object.
No
The objects are refit as needed with more control points to allow accurate deformation.
維持結構=是 (左) 與維持結構=否 (右)。
附註：這個選項無法使用在多重曲面上，如果選取的物件是多重曲面時，指令不會顯示這個選項。
請參考
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