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184 Chapter 5: Creating Geometry
have the effect of pushing their corresponding
facets in and out. Defaults=100.
Reset—Returnsaxestotheirdefaultsetting.
Vertices group
Parameters in the Vertices group determine the
internal geometry of each facet of a polyhedron.
Center and Center & Sides increase the number of
vertices in the object and therefore the number of
faces. These parameters cannot be animated.
Basic—Facets are not subdivided beyond the
minimum.
Center—Each facet is subdivided by placing an
additional vertex at its center, with edges from
each center point to the facet corners.
Center & S ides —Each facet is subdivided by placing
an additional vertex at its center, with edges f rom
each center point to the facet corners, as well as
to the center of each edge. Compared to Center,
Center & Sides doubles the number of faces in t he
polyhedron.
Note: If you scale the a xis of the object, the Center
option is used automatically, unless Center & Sides
is already set.
To see t he internal edges shown in the fig ure, turn
off Edges Only on the Display command panel.
Radius—Sets the radius of any polyhedron in
current units.
Genera te M a pping Coords—Generates coordinates
for applying mapped materials to the polyhedron.
Default=on.
Torus Knot Extended Primitive
Create panel > G eometry > Ex tended Primitives > Object
Type rollout > Torus Knot button
Create menu > Extended Primitives > Torus K not
Use Torus Knot to create a complex or knotted
torus by drawing 2D curves in the normal planes
around a 3D curve. The 3D curve (cal led the Base
Curve) can be either a circle or a torus knot.
Youcanconvertatorusknotobjecttoa
NURBS
surface (p age 1–1117)
.
Example of torus knot
Procedure
To create a Torus Knot:
1.
On the Create menu, choose Extended
Primitives > Torus Knot.
2. Dragthemousetodefinethesizeofthetorus
knot.
3. Click, then move the mouse vertically to define
the radius.
4. Click again to finish the torus.
5. Adjust the parameters on t he Modify panel.