Open the Sphere dialog, which lets you define spheres in Robot, using either method:
The dialog has four parts:
When the Sphere dialog is fully opened, then clicking one of the 3 buttons (Definition Method, Geometry, or Parameters) minimizes the corresponding part of the dialog so it displays only the options used at a given time. When the window is minimized, clicking one of the button extends the dialog.
Options for selecting the method for defining a sphere are located in Definition Method:
In the Geometry dialog, there are fields to specify the coordinates for the appropriate points of the sphere. The meaning of these points depends on the method for defining the sphere.
The following options are in the Parameters dialog (in the Properties field):
The Discretization field lets you define the number of divisions for the sphere that is generated (it does not apply to Solid Modeler objects).