AutoCAD Map 3D General Discussion

Posts: 23
Registered: ‎07-07-2010
Message 1 of 4 (663 Views)

Creating Multi-polygons

663 Views, 3 Replies
04-09-2012 12:57 PM



I am trying to figure out how to create multi-polygons with AutoCAD Map.


Preferably I would like to create them using the closed polylines i already have in my drawings. It would even by ok to create a multiple feature shape file, then join them together in to one feature using feature edit/map tools.


I have fiddled with the "MPOLYGON" tool, but I don't seem to be able to merge another polygon (MPMERGE = Unknown command??) after i have finished the initial "MPOLYGON" command, so this is not the best solution.


If I create a multiple feature shape file, then connect to the shape file and try to edit; The "MAPFEATUREMERGE" command lets me select both objects, but then asks "Specify feature ID for us {Select/New} <Select>. The select doesn't let me select either of the features I’m trying to merge, and the "New" kicks me out of the command or says invalid entry.


I am able to merge "touching" features, but not features separated by a gap.

I figure I’m probably overlooking something very basic, so any help that can be offered is appreciated.


If I haven't explained everything properly, let me know in a reply, and I’ll try to clarify



*Expert Elite*
Posts: 1,932
Registered: ‎11-13-2006
Message 2 of 4 (653 Views)

Re: Creating Multi-polygons

04-09-2012 02:51 PM in reply to: neilroper

Make sure your polylines are closed, look in the property palette at the closed property.

Look at using the _mapmpedit command to merge or add new boundaries to existing MPolygons.

Pay attension to the command line with all the options.


Supportting the troops daily.
Posts: 23
Registered: ‎07-07-2010
Message 3 of 4 (650 Views)

Re: Creating Multi-polygons

04-09-2012 03:13 PM in reply to: Murph

Thanks for the quick reply


The "MAPMPEDIT" allows me to add polygons to existing polygons; which i would then map export to create a "multi-polygons" shape file (I hope i have the terminology right). Unfortunatly, the polygons objects don't work very well for how i have to have my drawing configured. Is there a way to get the same result using just closed polylines?


Or is there a way to join exsting shape file features into a "multi-polygon"?



*Expert Elite*
Posts: 1,594
Registered: ‎06-03-2011
Message 4 of 4 (638 Views)

Re: Creating Multi-polygons

04-09-2012 11:27 PM in reply to: neilroper

I'd do that by means of topologies (command _MAPTOPOCREATE).

You then _MAPEXPORT the polygonal topology as a shapefile, and finally you _MAPIMPORT it back into your main drawing, enjoying nice mpolygons as islands, holed regions, and so on.

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