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184 Chapter 5: Creating Geometry
you c an choose which parts of the teapot to display
after creation.
Examples of teapots
His tor y of the Teapot
This teapot derives f rom the orig inal data
developed by Martin Newell in 1975. B eginning
w ith a graph-paper sketch of a teapot that he kept
on his desk, Newell calculated cubic Bezier splines
(page 3–915) to create a wireframe model. James
Blinn, also at the University of Utah during this
period, produced early renderings of exceptional
quality using this model.
Theteapothassincebecomeaclassicincomputer
graphics. Its complexly curved and intersecting
surface s are well suited to testing different kinds
of material mappings and rendering settings on a
real-world object.
Pr ocedur es
To create a tea pot:
1.
On the Create menu, choose Standard
Primitives > Teapot.
2. In any viewport, drag to define a radius.
As you drag, a teapot emerges with the pivot
pointatthecenterofitsbase.
3. Release the mouse to set the radius a nd create
the teapot.
To create a teapot part:
1.
In Parameters rollout > Teapot Parts group,
turn off all parts except the one you wan t to
create.
2. Create a teapot.
The part you left on appears. The pivot point
remainsatthecenteroftheteapot’sbase.
3. In Parameters rollout > Teapot Parts group,
turn off all parts except the one you want.
The teapot has four separate par ts: body, handle,
spout, and lid. Controls are located in the Teapot
Parts group of the Parameters rollout. You c an
check any combination of parts to create at the
same time. The body a lone is a ready-made bowl,
or a pot with optional lid.
To turn a part into a teapot:
1.
Selectateapotpartintheviewport.
2. On the Modify panel > Parameters rollout, turn
on all parts. (This is the default.)
The whole teapot appears.
You can apply modifiers to any separate part. If
you later turn on another part, the modifier affects
the additional geometry as well.
Interfa ce
Creation Method rollout
Edge—Draws a teapot from edge to edge. You can
change the center location by moving the mouse.
Center—Draws a teapot from the center out.