Create panel > Helpers > Manipulators > Object Type rollout > Plane Angle button
Create menu > Helpers > Manipulators > Plane Angle
The Plane Angle manipulator looks like a lever or joystick. By wiring its Angle value to a parameter of another object, you can create a custom control, with visual feedback, within a scene.


To change the angle of a plane angle manipulator:
Turn on Select And Manipulate.
Tip:
If you are still in the Create panel, turn on Select Object before using the manipulator. Otherwise, it is too easy to create
a new one.
In a viewport, move the mouse over the manipulator.
The manipulator turns red when the mouse is over it and it is available to be manipulated. Also, a tooltip appears, showing the name of the manipulator and its current value.
Drag the handle of the plane angle manipulator.
The Angle value changes as you drag the manipulator. This value can range between 0.0 and 360.0.
To select a plane angle manipulator:
To connect a plane angle manipulator so it controls another object:
Select the plane angle manipulator.
Note:
Select And Manipulate must be off before you can select the manipulator.
Choose Animation > Wire Parameters > Wire Parameters.
You can also right-click the manipulator and choose Wire Parameters from the Transform (lower-right) quadrant of the quad menu.
In the pop-up menu, choose Object, then the name of the parameter you want to manipulate.
The Parameter Wiring dialog appears.
In the Parameter Wiring dialog, make sure the direction goes from the manipulator to the object (or both directions), and then click Connect.
Close the Parameter Wiring dialog.
Now when you turn on Select And Manipulate and use the manipulator, the object updates under the manipulator's control.

Angle—The angle of the manipulator, from 0.0 to 360.0 (both values are perpendicular in the Y axis of the viewport where you created the manipulator, unless you have rotated the manipulator object). Default=0.0.
Distance—The length of the manipulator, in 3ds Max units. Default=the distance of mouse drag when the manipulator was created.
Size—The size of the manipulator's handle, in 3ds Max units. Default=1.0.