Torus

The Get->Primitive commands are available in all modules except Tools. They let you define primitive objects which are basic objects with a fixed geometric structure.

For detailed descriptions of polygon mesh objects, curves, and surfaces, as well as the modelling tasks you can perform with them, see the Modelling User's Guide.

The Get->Torus command creates a torus, which is a closed 3D doughnut-shaped object that may be a polygon mesh, a patch, or NURBS surface.

A torus is created by revolving a circle around the y axis.

1. Choose the Get->Torus command.
   
   The Create Torus dialogue box is displayed.
   
2. Select Polygon, Patch, or NURBS as the object type.
3. For a patch torus, select the type of curve (Linear, Cardinal, or B-Spline) for Longitude and Latitude (U and V).
4. For a NURBS torus, select the degree of the curve (Linear, Quadratic or Cubic) for Longitude and Latitude (U and V).
5. For all torus types, set the radii and the number of steps for Longitude and Latitude.
6. Click Ok or Cancel.

Parameters

Object Type

• Polygon creates a polygon mesh torus.
• Patch creates a patch surface torus using Linear, Cardinal, or
  B-Spline curve types for longitude/latitude.
• NURBS creates a NURBS torus of the first degree (linear), second degree (quadratic) or third degree (cubic), in either the U or V direction, or both.
  • Linear creates a NURBS surface of the first degree in the chosen direction. The resulting direction is of continuity zero (positional continuity). This is the default value.
  • Quadratic creates a NURBS surface of the second degree. The resulting direction is of continuity 1 (positional and tangential continuity).
  • Cubic creates a NURBS surface of the third degree in the chosen direction. The resulting direction is of continuity 2 (positional, tangential and curvature continuity).

Radius 1

Radius of the circle in SOFTIMAGE units revolved around the y-axis to make the torus.

Radius 2

Radius of the path of revolution in SOFTIMAGE units. This is the distance from the origin (global centre) to the centre of the torus.

Longitude (U) Step

Number of subdivisions on the vertical axis.

Latitude (V) Step

Number of subdivisions on the horizontal axis.

Last updated 02-apr-1998