topic Re: Polygon split in AutoCAD Forum

AutoCAD - Polygon split

sergiowaitforit — Tue, 06 Dec 2022 13:21:45 GMT

Hi sirs/madames ,

Anyone knows how to split some polygons that seem to be created under the same polyline?

I have world map in .dwg but I would like to remove the small islands to print and cut it into a wood panel.

Here there is an example:

Thank you!

[ The subject line of this post has been edited for clarity by @handjonathan Original: Polygon split ]

Re: Polygon split

cadffm — Mon, 05 Dec 2022 15:54:09 GMT

Hi,

a polyline is ONE object, so whatever your picture shows, it isn't just a normal polyline with usual properties .

Select the object, open your properties palette [CTRL]+[1]

Check out the Object type (listed first on top of the palette)

Looks like a HATCH or MPolygon.

You are working with AutoCAD?

Re: Polygon split

pendean — Mon, 05 Dec 2022 15:54:26 GMT

PROPERTIES command says what about what you selected at the very top? Show us please, "polygon" is too generic a term for what you screenshot here.

Re: Polygon split

ВeekeeCZ — Mon, 05 Dec 2022 15:55:19 GMT

Use the SEPARATES HATCHES option from the Hatch ribbon

Re: Polygon split

sergiowaitforit — Mon, 05 Dec 2022 15:57:23 GMT

Hi again,

Thank you for your quick answers sirs.

Yes, it is an MPolygon. Excuse my mistake.

Re: Polygon split

Kent1Cooper — Mon, 05 Dec 2022 15:57:48 GMT

"Splitting" and "removing" are very different. Post a small drawing file, clearly marking what you want to split [and what that means], what you want to remove, and how the two relate to each other.

Re: Polygon split

pendean — Mon, 05 Dec 2022 15:59:15 GMT

@sergiowaitforit Are you using MAP3D or Civl3D? You are in the wrong forum for both of those software and editing that object type.

Re: Polygon split

sergiowaitforit — Mon, 05 Dec 2022 16:07:10 GMT

I would like to delete these islands for example:

I am using AutoCAD 2019.

Re: Polygon split

Kent1Cooper — Mon, 05 Dec 2022 16:13:16 GMT

@sergiowaitforit wrote:

I would like to delete these islands for example:

....

I don't have the software overlay to work with MPolygons [see Message 7], but if they're like Hatches as implied by other replies, does it work to draw a big Circle around those islands, and use it as a cutting boundary in a TRIM command?

Re: Polygon split

cadffm — Mon, 05 Dec 2022 16:29:08 GMT

Select your mpoly,

use EXPLODE command

and if you like to have the filling back, create new hatchs for it:

command Hatch

The HatchEditor tab is current now,

entlarge the panel "Options" and make sure your option "separate hatchs" is ON.

Object<Select> option

and if Acad ask for objects, type in:

P<followed by enter><followed by enter>