You can create a sphere surface by parameters. Click View, Geom Surface to toggle the display of individual surface.
To create a sphere:
Click Sphere(Surface toolbar) or click Geometry, Surface, Sphere.
In the dialog, select the sphere creation type:
Parameters. Create a sphere by parameters. The parameters contains:
Center Point . Select a point as the center of the sphere. Select another point as the point on the surface or define the radius directly.
a. by coordinate system b. by center pointTetrahedron. Select four points to create circumscribed or inscribed sphere.
a. circumscribed sphere b. inscribed sphere