Torus

Create a torus (donut shape).

1. On the ribbon, click the Surfaces tab.
2. Click the Torus icon.
   
   
3. Drag to define the outer diameter.
4. Move the cursor to define the inner diameter, and then click.
5. Right-click and mouse through the check mark to exit, or double-right-click.

Resize the torus or change the sweep angle.

1. Double-click the torus to enter edit mode.

   To	Do this
   Change the outer diameter	Drag the outer diameter. Click the text box along the outer diameter, and then type a value.
   Change the inner diameter	Drag the inner diameter. Click the text box along the inner diameter, and then type a value.
   Change the height	Drag the height. Click the text box along the height, and then type a value.
   Change the longitude sweep angle	Drag a longitude arrow. Click a longitude arrow, and then type an angle.
   Change the latitude sweep angle	In the Control Panel, click the text box next to the Latitude Start Angle or Latitude End Angle, and then type a value.

2. Right-click and mouse through the check mark to exit, or double-right-click.

Select a degree option and then reposition or change the number of the control points in order to manipulate the shape of a torus.

1. In the guide bar, select NURBS Degree 2, 3 or 5.
   Note: Select a higher degree for a smoother curvature.
2. Modify the control points.

   To	Do this
   Change the number of points	In the guide bar, enter the number of Points.
   Reposition a point	Drag a point. Click a point, and then enter the x, y, and z coordinates.
   Modify multiple points	Click a blue line, and then drag one of the selected points. Box select the points, and then drag one of the selected points.
   Undo changes for selected points	Click the points you want to revert, and then in the guide bar, select Un-edit selected.

3. Right-click and mouse through the check mark to exit, or double-right-click.

Figure 1. Exact

Figure 2. Degree 3