topic Betreff: Island Detection not working in BOUNDARY in AutoCAD Forum

Island Detection not working in BOUNDARY

TUCKerws — Sun, 29 Jan 2023 21:43:10 GMT

The Boundary command is not detecting internal islands. The only system settings I've found with regards to Island Detection are in HATCH. I have tried Normal and Outside. Neither make a difference.

Also HATCH is not detecting islands either.

I assume it is the same issue affecting both commands.

Can someone please tell me what system settings relate to Island Detection?

Betreff: Island Detection not working in BOUNDARY

cadffm — Sun, 29 Jan 2023 21:56:41 GMT

Tried with new created nested rectangles, same issue?

Re: Island Detection not working in BOUNDARY

john.uhden — Mon, 30 Jan 2023 01:16:13 GMT

@TUCKerws

I hope in this case you are trying to create a region. I think that using the BOUNDARY command to create polylines will result in creating one polyline, which does not have islands.

Plus, you may have to select the objects that create the island(s). Hmm, it seems that even regions can't have islands.

Stick with hatching. You can reproduce the boundaries using the HatchEdit command.

Betreff: Island Detection not working in BOUNDARY

TUCKerws — Mon, 30 Jan 2023 01:27:19 GMT

Yes. Same issue.

I can create any polygon, then create a second one fully inside the first. Island detection will not register the second polygon using BOUNDARY to create either a Polyline or a Region. (HATCH also does not acknowledge the island.)

I have tried it with Island Detection checked and unchecked just to confirm.

If I then create 2 polygons in the same manner, then create a third polygon that overlaps the first one, the BOUNDARY command can see the interaction of the first and third, but still ignores the second polygon. Again, with Island Detection checked and unchecked to confirm.

Re: Island Detection not working in BOUNDARY

TUCKerws — Mon, 30 Jan 2023 01:39:55 GMT

Thank you for your input, but BOUNDARY to create polylines has had Island detection for more than a decade. I've been using that feature from version 2011 through version 2022. I installed 2023 a few weeks ago and have not been able to do it with the current version. I assume it is either a System Variable that I have never had to change in previous versions, or this is another bug with Windows 11. (Similar to the Drag-&-Drop debacle with Layer Group filters.)

I mostly use BOUNDARY to create Polylines, or Regions to extrude into 3D. I don't think Hatch will work for this.

I can extrude and subtract to get the geometry I need, but I don't want to repeatedly do more steps than necessary when the program should (and probably still does) have the functionality to do this work efficiently.

Re: Island Detection not working in BOUNDARY

cadffm — Mon, 30 Jan 2023 08:55:37 GMT

There is only the HPISLANDDETECTIONMODE, what controle the default setting for your Island-checkbox in boundary dialog, nothing else.

If you enable the Island checkbox, ALL islands (also nested) get a new boundaryobject,

if you disable the Island checkbox, the outer boundary get a new boundaryobject.

>>"Also HATCH is not detecting islands either."

Wow. What is your Productversion (Screenshot of dialog, command: ABOUT)

Any alerts?

Boundary (Island detection since R12 If I am right)

Re: Island Detection not working in BOUNDARY

TUCKerws — Tue, 31 Jan 2023 01:48:44 GMT

I was afraid of that.

HPISLANDDETECTIONMODE is set to 1.

Product Version: T.161.0.0 AutoCAD 2023.1.2

I'm not aware of an alert, but I may have missed it.