Drawing a Torus

Draw a torus by selecting its center point, major radius, and minor radius. The modeler then sweeps a circle around a circular path. A torus is drawn as true surfaces in the modeler. Before you draw a torus, you can specify the coordinate system, and you can set the drawing plane as Z, Y, or Z, or you can edit the plane in the properties.

From the menu bar, click Draw> Torus or, on the Draw ribbon tab, click the Draw torus icon:
Select the center point of the torus in one of the following ways:
- Click the point.
- Type the point's coordinates in the text boxes in the status bar.
  
  The Status bar also includes options to specify the Coordinate System as Absolute or Relative, and drop down menu options to specify the torus in Cartesian, Cylindrical, or Spherical coordinates.
Specify the major radius by selecting a point in one of the following ways:
- Click the point.
- Type the coordinates of the point relative to the center point in the dX, dY, and dZ boxes, where d is the distance from the previously selected point.
The major radius determines the diameter of the torus.
Specify the minor radius by selecting a point relative to the major radius point.
The minor radius determines the diameter of the "donut hole".
If the Modeler option for editing properties of new primitives is checked, the Properties dialog box appears, enabling you to modify the object's properties.
Double-click or right-click to open the shortcut menu and click Done. The torus appears in the Modeler window and in the History Tree.
If the Modeler option for editing properties of new primitives is checked, the Properties dialog box appears, enabling you to modify the object's properties. Click OK.

Note:

The 3D Modeler permits drawing true curved objects. However, the solution is obtained using a tetrahedral mesh, which conforms to the true surface only within the limits identified by certain mesh settings. The modeler has default settings for this conformance, which is a reasonable trade-off between solution speed and solution quality for most objects but may not be ideal for all such objects. High-aspect ratio curves structures (such as helices with narrow and curved cross-sections) may benefit from user control of the faceting values. For details about these commands see:

Surface Approximation and related sections:

Rectilinear Elements and Curvilinear Elements and Guidelines for Modifying Surface Approximations.