points to lines/arcs

[vmax549]

Does anyone know of a lisp or macro that can take set of points taken from around the outside of an object(probed points) and convert them to lines and arcs. It would be nice IF you could specify a tolerance of what is a straight line and what is an arc.

Thanks (;-) TP

[337MPH]

did you manage to get an answer to this? i need something of the same need to take a set of points that are in a group and make them into a spline or surface

[ImanCarrot]

If you have the X and Y co-ordinates then it's easy peasy-

Create a plain text file using WordPad or similar. Make sure it's got SCR as an extension.
Cut and Paste the X and Y co-ordinates into the file- one set per line and X,Y separated by a comma.
Make sure the first line of the SCR file says "PLINE" (without the quotes).

So, an example file would look like this:

PLINE
10.9876,1.2345
10.8765,1.3456
10.7654,1.4567
etc...

Save it somewhere you'll remember.
Boot up AutoCAD. Type in "SCRIPT" and select the file you just made- AutoCAD will import all the co-ordinates as a polyline. Ta Da!

If you need them as individual lines then just EXPLODE the polyline.

Hope this helps!

[337MPH]

now will that same thing work if there X Y Z cords? and use a 3dpoly line? or can you only do a 2d version

ill test it either way tho

thanks for the info

JM

[ImanCarrot]

Not sure MPH..would be interesting to know though!

As you can see from my Avatar, I'm only a simple 2 Dimensional engineer

[ger21]

Yes, just use:

3Dpoly
x,y,z
x,y,z
etc......

[vmax549]

Gerry when you explode the Pline does it make full length lines and arcs or just lines from the many many points. The problem I was trying to overcome was to end up with thousands of small line segments. It drives the machines crazy and really slows them down.

Thanks (;-) TP

[ger21]

It breaks it at every vertex, so even if you have a straight segment composed of 5 sections, you'll get 5 lines when exploding. It's not smart enough to convert the 5 lines into 1.