topic Reduce Verticies with UrbanLISP in Visual LISP, AutoLISP and General Customization Forum

Reduce Verticies with UrbanLISP

jfantiC96W2 — Fri, 10 Jan 2025 19:31:47 GMT

I know AutoCAD doesn't offer any tools to reduce the amount of verticies on a polyline, so I found this UrbanLISP that is supposed to do the job but I keep getting this error:

Command: RXV
Remove eXcess Vertices...
Select polylines...
Select objects: 1 found
Select objects:
Analyzing polylines...
Unfortunately an error occured... Error caused by bad argument type: consp nil

What does this mean and is there any direction on how to fix this?

Re: Reduce Verticies with UrbanLISP

Kent1Cooper — Fri, 10 Jan 2025 19:50:53 GMT

It means some function is wanting to be given a list [possibly limited to a dotted-pair list?] such as an entity data entry, but is getting nil instead, which is an invalid argument for whatever it's trying to do. That message isn't in typical AutoCAD wording, so I suspect it's built into the code itself -- can you post that?

Or, you could try my PLDiet.lsp routine, >here<. Whether that's what you want, you would need to decide -- it does it by testing for segment lengths and amount of bend angle between them, relative to limits you specify, and also removes all intermediate vertices along collinear stretches, no matter how long. If your needs are simpler, I also have one that just removes every other vertex, in a brute-force way regardless of lengths or bends or arcs or anything [attached].

Re: Reduce Verticies with UrbanLISP

jfantiC96W2 — Fri, 10 Jan 2025 19:53:16 GMT

Awesome, PLEO works fine for what I need. Thank you so much