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Become adept at manipulating the UCS in 3D. The XY plane of the current
UCS operates as a work plane to orient planar objects such as circles and
arcs. The UCS also determines the plane of operation for trimming and
extending, offsetting, and rotating objects.
Use object snaps and grid snap carefully to ensure the precision of your
model.
Use coordinate filters to drop perpendiculars and easily locate points in
3D based on the location of points on other objects.
Add 3D Thickness to Objects
Use the thickness property to give objects a 3D appearance.
The 3D thickness of an object is the distance that object is extended, or
thickened, above or below its location in space. Positive thickness extrudes
upward in the positive Z direction; negative thickness extrudes downward
(negative Z). Zero (0) thickness means that there is no 3D thickening of the
object.
The orientation of the UCS when the object was created determines the Z
direction. Objects with a non-zero thickness can be shaded and can hide other
objects behind them.
The thickness property changes the appearance of the following types of
objects:
2D solids
Arcs
Circles
Lines
Polylines (including spline-fit polylines, rectangles, polygons, boundaries,
and donuts)
Create 3D Models | 301
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