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344 Chapter 5: Creating Geometry
Parameters rollout
Operands group
Operand list—Displays the current operands. Each
operandislistedas"Op"followedbyanumber
and the name of the object that is b eing used as
the operand. The operand name comprises layer,
color, or object type name plus a numeric suffix.
Delete Oper and—Deletes a selected operand from
the Operands list.
Form group
•
Graded Surf ace—Creates a graded sur face of the
mesh over the contours.
Terrain created as a graded surface
• Graded Solid—Creates a graded surface with
skirts around the sides and a bottom surface.
This represents a solid that is visible from every
direction.
•
Layered Solid—Creates a "wedding cake"
or laminated solid similar to cardboard
architectural models.
Terrain created as a "layered solid" surface, with levels
Stitch Border—When on, suppresses the creation of
new triangles around the e dges of terrain objects
when edge conditions are defined by splines that
are not closed. Most terrain forms display more
reasonably when this is turned off.
Retr iangulate—The basic Terrain a lgorithm tends
to flatten or notch contours when they turn
sharply upon themselves. A typical situation in
which this may happen is when a narrow creek