2004

Table Of Contents
312 | Chapter 16 Draw Geometric Objects
You can use REVOLVE on closed objects such as polylines, polygons, rectan-
gles, circles, ellipses, and regions. You cannot use
REVOLVE on 3D objects,
objects contained within a block, polylines that have crossing or intersecting
segments, or polylines that are not closed.
Create a Composite Solid
You can combine, subtract, and find the intersection of existing solids to
create composite solids.
With
UNION, you can combine the total volume of two or more solids or two
or more regions into a composite object.
With
SUBTRACT, you can remove the common area of one set of solids from
another. For example, you can use
SUBTRACT to add holes to a mechanical
part by subtracting cylinders from the object.
Y axis
1
2
2
original polyline revolved about X axis revolved about Y axis
object to revolve selected
axis selected
result
1
2
X axis
1
objects to be combined result
1
2