Use BPOLY to create an AutoCAD Shrinkwrap entity

AutoCAD BPOLY command

Instead of using commands such as Copy, Trim, Pedit with Join to create a closed polyline around multiple entities try using the BPOLY command.

The BPOLY command will open the Boundary Creation Dialog box.

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To create a closed polyline around the outside of the objects simply create a rectangle polyline enclosing the objects before running the BPOLY command.  This will ensure you can use the Island detection option.  Make your pick point between the rectangle polyline and the objects.

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Finally delete the polyline rectangle once the closed polyline has been created.

Addendum example:

Objects that formed multiple closed spaces.  The idea behind using the rectangle is to shrinkwrap the largest combined closed space that the objects made.

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Bob Mecham

Bob Mecham

Bob joined the training and consulting firm EnvisionCAD in 2000 and became a partner in June of 2002. He has specialized in the software MicroStation & InRoads from Bentley Systems, Inc. Mr. Mecham is an industry expert in the implementation, configuration, development, and customization of the two software applications MicroStation and InRoads. Bob instructs MicroStation classes ranging from fundamentals to advanced productivity. He has extensive experience using, implementing, and instructing both InRoads Survey and InRoads Site Design. Bob received his degree in Civil Engineering Technology from the Madison Area Technical College in 1992 and has over a decade of experience in the use, implementation, and management of software and CADD systems. He has worked for a wide range of organizations providing services from general survey and engineering services to specific applications such as landfills and site design.


2 comments on “Use BPOLY to create an AutoCAD Shrinkwrap entity

  1. Marco Reply

    Why don’t you just click inside the figure? It’s exactly the same since the entities have no thickness. In your example there is no ‘inside’ or ‘outside’.
    So, this makes your tipp useless. Sorry I have to say that.
    Cheers, Marco

  2. Eric Eric Reply

    Thanks for the comment. When the objects create a single closed space, you are right, there would be no need for creating a surrounding closed shape.
    The Addendum Example should depict the shrinkwrap idea better.

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