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Chapter 5: Creating and Editing Primitive Objects

FIGURE 5.11
Creating hemispheres with the Chop and Squash options

Note
You can use the Slice feature on several primitives, including the sphere, cylinder, torus, cone, tube, oiltank,
spindle, chamfercyl, and capsule. n

FIGURE 5.12
Using the Slice option to create sphere slices

The Base to Pivot parameter determines whether the position of the pivot point (or the point about which
the object rotates) is at the bottom of the sphere or at the center. The default (with the Base to Pivot setting
not enabled) sets the pivot point for the sphere at the center of the sphere.

Cylinder
You can use a cylinder in many places—for example, as a pillar in front of a home or as a car driveshaft. To
create one, first specify a base circle and then a height. The default number of sides is 18, which produces a
smooth cylinder. Height and Cap Segments values define the number of polygons that make up the cylin-
der sides and caps. The Smooth and Slice options work the same as they do with a sphere (see the preced-
ing section).

Tip
If you don’t plan on modifying the ends of the cylinder, make the Cap Segments equal to 1 to keep the model
complexity down. n

Torus
A torus (which is the mathematical name for a “doughnut”) is a ring with a circular cross section. To create a
torus, you need to specify two radii values. The first is the value from the center of the torus to the center of
the ring; the second is the radius of the circular cross section. The default settings create a torus with 24
segments and 12 sides. The Rotation and Twist options cause the sides to twist a specified value as the ring
is circumnavigated.

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