To create an ellipsoid, in the Geometry toolbar, from the
More Primitives (
) menu, select
Ellipsoid (
). You can also right-click the
Geometry node to add this node from the context menu. Then enter the properties of the ellipsoid using the following sections:
From the Type list, select
Solid or
Surface to specify if the ellipsoid is a solid object or a (hollow) surface object.
Specify the direction of the ellipsoid’s third axis — that is, the principal axis corresponding to c-semiaxis. From the
Axis type list, choose
x-axis,
y-axis, or
z-axis (the default)
to obtain an axis aligned with the specified coordinate axis. Choose
Cartesian to enter a direction vector in the
x,
y, and
z fields. Choose
Spherical to enter the direction using the angles
theta (polar, zenith) and
phi (azimuth).
Specify the rotational angle about the ellipsoid’s third axis in the Rotation field. When this angle is zero (the default), the ellipsoid’s second axis is parallel to the
xy-plane.
The coordinate system in which the position, axis, and rotation angles above are interpreted. From the Work plane list, select
xy-plane (the default, for a standard global Cartesian coordinate system) or select any work plane defined above this node in the geometry sequence. If you choose a work plane, the work plane and its coordinate system appear in the Graphics window, using an extra coordinate triad with the directions
xw,
yw, and
zw (which are then used to specify the ellipsoid’s position).
Layers can be used to create sandwich primitives by adding several concentric ellipsoids. You specify the thicknesses of layers in the Layers table, and optionally a name for each layer. The outermost layer comes first. Each layer must have a minimal thickness (depending on the size of the geometry).
Select the Resulting objects selection check box to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the ellipsoid consists of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the
Show in physics (
Show in instances if in a geometry part) list:
All levels,
Domain selection,
Boundary selection,
Edge selection, or
Point selection. The default is
Domain selection, which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose
Boundary selection. These selections do not appear as separate selection nodes in the model tree. Select
Off to not make any selection available outside of the geometry sequence. From the
Color list, choose a color for highlighting the resulting objects selection. See
Selection Colors.
Select the Construction geometry check box to make the resulting objects available only in the feature’s geometry sequence. For more information, see
Construction Geometry.