Autocad Contour Lisp

Free Lisp Routines for AutoCAD and CorelCAD Free Lisp Routines for AutoCAD and CorelCAD Please find below a list of CAD lisp routines which I have written to automate common UK road design tasks when using CAD programs such as AutoCAD or CorelCAD These free lisp routines were tested using which accepts AutoLisp. Therefore I assume these lisp routines will also work on AutoCAD, but as I don't have access to AutoCAD I cannot confirm this You're welcome to download, use, copy, amend, and adapt these files, but at your own risk. I offer no support should these routines or commands not function as you expect. However, please feel free to leave constructive comments (see foot of webpage) and suggested improvements. I've checked these files for typing mistakes, but I suspect there's still some errors I haven't found yet Beyond the table below, each command is explained in more detail (click on the command names to scroll down this webpage) Lisp files Commands Description (right click and select 'Save target as.'

Unzip files to Autocad support directory or any directory in Autocad's search path. Type (load'ctl_w8') at the command prompt to load routine. Type 'CTL' at the command prompt for option list. Command: ctl 1. Draw Triangulated Surface. Draw Contour Lines. Swap Triangle Pairs. Re-point Contour Lines. Color Objects.

To download) Version 1.05 21-Jul-2015 (Version changes: 2D/3D point error resolved for polylines containing arcs.

AutoLISP Solutions: Create Long Intermediate Terrain Contours 15 Sep, 2005 By: Cadalyst AutoLISP can form an intermediate contour that assumes a linear interpolation between the contour heights Rami Mann e-mailed a request to draw a polyline between two existing polylines representing terrain contours. His project is missing some contours, and he wants to form an intermediate contour assuming a linear interpolation between the contour heights. The AutoLISP solution is CONTOURS.LSP, which allows the user to select any two polylines (lightweight or 2D) and enter a precision number (default 100) for the number of segments in the resulting polyline. If the terrain changes height rapidly in some places and is flatter in others, then the contours will be close together in parts and may be far apart in other sections (figure 1). A bonus file I wrote, RPL.LSP, will come in handy to reverse the direction of any selected polyline. Terrain contours with varying distances between them.

The lengths of the polylines in figure 1 are about 6,500 units and 5,300 units for the outer and inner contours, respectively. Applying CONTOURS.LSP to the parts of the contours that are somewhat parallel shows better results than those that vary wildly (figure 2). The precision (number of segments) gave good results for anything over 200 but did not improve much between 300 and 2,000. It took about 1 second for 200 points and about 5 seconds for 1,000 points to generate the curve. A contour generated between two existing contours.

Get the Code Download the files from Cadalyst's CAD Tips site and save them in AutoCAD's Support directory. Use the Appload facility by selecting Tools / Load Application. Then select the CONTOURS.LSP and RPL.LSP programs from where you stored them. How to Use the CONTOURS Code After you load the code, the system prompts you to enter CT to start the program. To see this prompt, you may need to set your Command window size to 3 lines by dragging the Command window splitter bar appropriately. If you are using AutoCAD 2006 and you are not using the Command line area, you can still enter CT to start.