I've just written another routine over the week-end. This program can create a Surface (Digital Terrain Model) from random point data in AutoCAD. I used Delanay's Triangulation as the mathematical model. I have tested on a couple of ascii point file and it seems to work well, at least for my need. If anyone wants to try it out he or she can download it from: [URL="http://www.cadtown.com"]www.cadtown.com[/URL] The files are: DTM2n3.zip(autoCAD 2000/2002) & DTM2004.zip (AutoCAD 2004/2005). Thanks for trying it out and visiting my website: [URL="http://www.cadtown.com"]www.cadtown.com[/URL]