Explode Spline

[majora]

Is it possible to explode a spline contour?? If so, how do I go about doing so. The explode command doesn't work. Thanks for your help in advance.

 

[lpseifert]

This routine will convert a spline into a pline; not exactly though. Thanks to an unknown author

(defun C:SPLINE2PLINE (/ SPLINES PLINETYPE OSMODE I SPL ED CODEPAIR)
  (if
    (setq SPLINES (ssget (list (cons 0 "spline"))))
     (progn
       (if
         (zerop (setq PLINETYPE (getvar "plinetype")))
          (setvar "plinetype" 1)
          ) ;if
       (setq OSMODE (getvar "osmode"))
       (setvar "osmode" 0)
       (setq I 0)
       (while
         (setq SPL (ssname SPLINES I))
          (setq    I  (1+ I)
                ED (entget SPL)
                ) ;setq
          (command ".pline")
          (foreach
               CODEPAIR
                       ED
            (if
              (= 10 (car CODEPAIR))
               (command (cdr CODEPAIR))
               ) ;if
            ) ;foreach
          (command "")
          (command ".pedit" "l" "s" "")
          ) ;while
       (if PLINETYPE
         (setvar "plinetype" PLINETYPE)
         )
       (setvar "osmode" OSMODE)
       ) ;progn
     ) ;if
  (princ)
  ) ;defun

____________________
Acad2005, Terramodel

 

[majora]

Now I have another question....how do I use a routine?

 

[lpseifert]

First copy/paste the above code into Notepad. Save the file as spline2pline.lsp in the support directory of AutoCad.
At the command line type (load"spline2pline") to load the lisp routine. To invoke the command type spline2pline at the command line.

____________________
Acad2005, Terramodel

 

[LHA]

Save a copy of the file before you De-spline, you won't like the results.

Contours should be created using plines and arcs with elevations. You'll agree once you de-spline.

A spline is an approximate depiction of curved path through the actual vertices, pline and arcs are precise paths, from point to a point. What looks like a nice smooth slope now will become a jumble of lines, and be virtually unuseable.

For this project, unfortunately, you are stuck with the splines, which can't be manipulated reliably. You'll have to actually redraw the ones you need to offset or measure the areas. SOME of the vertices MIGHT be on a Z location equal to the elevation, but check carefully.

Engineering is the practice of the art of science - Steve

 

[CarlB]

You can covert a spline to a polyline using the Express Tools "FLATTEN" command. There is also a free routine to do this at

http://www.dotsoft.com.

 

[majora]

Thank you everyone, I got the part figured out and burnt.