Chapter 11 Modifying Objects
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Using the BLEND Command U s ing the BLEND Comm a nd
The
BLEND
command allows you to construct a spline between lines, arcs, poly-
lines, polyline arcs, splines, elliptical arcs, and helixes. Blending a spline can be effective
when an irregular curve is required, typically to fi ll a break between nonintersecting
objects when the curve data is unknown.
Access the
BLEND
command and use the
CONtinuity
option to specify the type of
continuity. The
Tangent
option forms a degree 3 spline with a mathematical algorithm
known as “G1 geometric continuity.” The
Smooth
option forms a degree 5 spline with
“G2 geometric continuity.” Pick two existing objects to draw the spline. See Figure 11-9.
Using the BREAK Command U s ing the BREAK Comm a nd
The
BREAK
command can remove a portion of an object or split an object at a
single point depending on the points and option you select. By default, the point you
pick when you select the object to break also locates the fi rst break point. To select
a different, possibly more accurate fi rst break point, use the
First point
option at the
Specify second break point or [First point]:
prompt. See Figure 11-10. Pick a second break
point away from the fi rst break point to break the part of the object between the two
points. Preview the operation before making the second pick.
BLEND
Ribbon
Home
Modify
Blend Curves
Type
BLEND
BL
BREAK
Ribbon
Home
Modify
Break
Type
BREAK
BR
NEW

Figure 11-9.
Using the
BLEND
command to draw
a spline between
two lines. Preview
the operation before
making the second
pick.
Process Result
Pick Pick
Preview
Figure 11-10.
Using the
BREAK
command to break an object. When using the default method, the first pick
selects the object and the first break point. Use the
First point
option to select the object to
break and then specify accurate break points using object snaps, such as the
Endpoint
object
snap as shown here.
Process
Result
Selecting Object and First Break
Point with One Pick
Using
First point
Option
Pick 1
Pick 2
Pick 2
(Endpoint)
Pick 3
(Endpoint)
Pick 1
(anywhere on line)