Topic: [LISP] How to smooth polyline

[delkov]

Hi, everyone.
I have a question, the problem is that I have a  some closed polyline and I want remove its sharp edges, make it more smooth.
I tried PEDIT -> Fit/Curve - nothing.

May be do this: polyline -> entity point list (via Lee-Mac's program http://www.lee-mac.com/entitytopointlist.html) and then make spline by this points, with certain toleration or something like this.

But this Lee-Mac's program doesn't work for me [cad2015 x64].

What's the solution ?

Thanks. 

[roy_043]

Try using Fillet.

[delkov]

Fillet works with lines, I think..
I can trim and then use fillet, but I want do it automatically..

[tedg]

Fillet works with lines, I think..
I can trim and then use fillet, but I want do it automatically..

Fillet works with polylines too right in the fillet command.


command: fillet> radius <your desired radius> Polyline <select your pline>

[delkov]

I select radius - > click polyline and get the screen

[delkov]

But I can click, and I get some arcs..

[tedg]

But I can click, and I get some arcs..

Not sure exactly what you want to do, but your original post just mentioned "removing the sharp edges" so if you simply pick a reasonable radius for all your corners it should work.

[tedg]

And fillet works at any individual corner on a polyline too, so if you just want to clean up one corner you can do it.

[delkov]

Well, may be I didn't explain properly. I want to remove all sharp corners (make pline more smooth) on the pline by using some lisp routine.

[roy_043]

Code - Auto/Visual Lisp: [Select]

1. (command "_.fillet" "_radius" 10 "_.fillet" "_polyline" (car (entsel)))

[delkov]

I did it, but polyline change only a litle bit, even if I set big radius

[roy_043]

There two problems with your polyline:
1. It is a POLYLINE of the acCubicSplinePoly type.
2. Some vertices are too close together for the desired fillet radius.

[tedg]

There two problems with your polyline:
1. It is a POLYLINE of the acCubicSplinePoly type.
2. Some vertices are too close together for the desired fillet radius.

That's what I meant by picking a reasonable radius, if I know that a certain radius will work for all my corners (even the sharpest ones), that's what I'd use for all of them.

[delkov]

There two problems with your polyline:
1. It is a POLYLINE of the acCubicSplinePoly type.
2. Some vertices are too close together for the desired fillet radius.

Ok, I see. So, wnat do I need to do?
How to change type/delete verticies..?
Thanks in advance.

[roy_043]

The manual approach:
1. Decurve the polyline.
2. Trim away polyline segments around the sharp corners.
3. Fillet.
4. If required rejoin into a single polyline.
5. Curve the polyline.