This command has options for applying smoothing to polylines.
Select the radio button for the smoothing option you want to apply.
If you use Quadratic B-Spline type smoothing or Cubic B-Spline type
smoothing, the Spline
Segments AutoCAD system variable is relevant. The Curve Fit
option provides the least smoothing, and the Cubic B-Spline option
applies the most. Another effective way of smoothing is by creating
the contours from rectangular meshes using various grid
resolutions. Increase the smoothing by lowering the grid resolution
and decrease by raising the grid resolution. The Bezier option
provides an incremental type of smoothing. The Linetype Generation
option turns on the Ltype
Gen flag for the selected polylines. For more information on
this option and the spline smoothing options, look up the
PEDIT command in the
AutoCAD Reference Manual. After selecting the OK button the
routine will prompt for needed values.
Bezier smoothing is also embedded in many of the routines that
create contours. Bezier smoothing applies the Bezier smoothing
algorithm to polylines. This smoothing technique has two advantages
over Spline or Curve Fit smoothing. One is that a Bezier smoothed
polyline will pass through all of the vertices in the original
polyline, while a Spline smoothed polyline only curves towards the
original vertices and can pull away from vertices at sharp corners.
Hitting all the original vertices can be an important feature in
contour maps for maintaining the exact location of the contours.
Another benefit of Bezier smoothing is the ability to control the
looping and vertex factors. A higher looping factor increases the
curving effect. Use this setting with some care, as too high a
looping factor may cause nearby contour lines to cross after the
smoothing has been applied.
Vertex reduction can also be applied along with the smoothing.
This avoids having to create smoothed polylines with numerous
vertices and then having to reduce these vertices in a second step.
Be sure not to make the cutoff offset for reduction too high or you
can negate or even reverse the smoothing effect. One disadvantage
to Bezier smoothing is that it cannot be decurved like the other
smoothing techniques.
Enter the looping factor (1-10)
<5>: press Enter This determines the extent of
curving. 1- least curvy, 10 - most curvy.
Enter the offset cutoff
<0.05>: press Enter This value is the maximum
shift distance for vertices reduction. A higher value removes more
vertices.
Select polylines to smooth.
Select objects: pick
polylines
Before
Smoothing
After
Smoothing