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    2D entity inside entity

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    • S Offline
      SungH
      last edited by

      Hey guys,

      I just started working with SketchUp a few days ago so bare with me. I work with AutoCAD, and instead of spending thousands on upgrading from LT, I got SketchUp for my 3D rendering.

      I am trying to draw up a 3d rendering of a map, so i imported all the polylines from AutoCAD. There are thousands of polylines and I didn't want to make them an entity one by one so i converted the polylines to regions in AutoCAD before i imported them to SketchUp.

      My next step is to remove some entities inside the entities (like a 2D donut) and i am just stuck on this step. I need to figure out how to make the inner entities become a hole for the outer ones, and like i said, there are thousands of them.

      If anybody can offer some advice or solution to my problem, i would greatly appreciate it.

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      • KrisidiousK Offline
        Krisidious
        last edited by

        If it's already a component or a group when it comes from autocad there is a plugin instances I think it's called? it will find groups that are the same and make them components, then when you make a change it one it is reflected across all the same components.

        I think this will do it also.

        http://sketchucation.com/forums/viewtopic.php?t=14975

        By: Kristoff Rand
        Home DesignerUnique House Plans

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        • S Offline
          SungH
          last edited by

          Sorry, that was not the answer i was looking for. I attached some pictures to clarify a bit.

          The first picture is what i have right now. The second picture is when i delete the inner polygons.

          I need the inner polygons as holes for the outer polygon.


          H-PlsWo.pdf


          H-PlsWo2.pdf

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          • Dave RD Offline
            Dave R
            last edited by

            How about if you post the SKP file instead? It would a lot better than looking at your PDFs. And if you're going to upload images, please use JPG or PNG files so we can actually see them without having to download them to our computers. I can't see any difference between your two PDF files anyway.

            Etaoin Shrdlu

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            • S Offline
              SungH
              last edited by

              Sorry, but i can't upload the SKP file because it is a military base plan.

              I put up a Jpeg this time.

              The top left picture is the outer polygon and the bottom left is the inner polygon. The top right picture is after i delete the inner polygon. I need a hole the shape of that inner polygon in the outer polygon but i just can't seem to figure it out.


              H-PlsWo3.jpg

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              • Dave RD Offline
                Dave R
                last edited by

                Oh. I think I see now. This is a very fundamental thing in SketchUp. Select the ovals (your "inner polygons") and explode them. You've already said those polygons, ovals from now on, are inside the Outer shape so you'll need to have that outer shape's group or component open for editing before you explode the ovals. At this point you may be able to simply select the faces inside the ovals and delete them but I would select all of the geometry inside the component/group, right click and run Intersect Faces>With Selection.

                Since you have a large number of these ovals whose inner faces you want to delete, I would get the Select tool, double click on the face you want to keep and then use Edit>Cut, Ctrl-X to cut that face and its edges to the clipboard. Select what is left and delete it. Use Edit>Paste in Place to restore the face you want to keep.

                Inner Polygons as components. Before exploding.
                After exploding. Double click on the face to be kept.
                After Edit>Paste in Place

                Etaoin Shrdlu

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                • Jean LemireJ Offline
                  Jean Lemire
                  last edited by

                  Hi folks.

                  See the trick I give in this thread to quickly delete all the inside faces of holes before pulling a shape.

                  http://sketchucation.com/forums/viewtopic.php?f=79%26amp;t=57308

                  Just ideas.

                  Jean (Johnny) Lemire from Repentigny, Quebec, Canada.

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                  • S Offline
                    SungH
                    last edited by

                    The group that the CAD import creates is a bit wierd when i go into edit mode. Instead of making one entity of the whole polygon it creates several individual entities for that polygon group.

                    I attached a file of one parking lot (which i should have done in the first place).


                    Blah.skp

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                    • Dave RD Offline
                      Dave R
                      last edited by

                      The parking islands are separate groups outside the parking lot group. And your parking lot group is divided into a whole bunch of faces. It needs cleaning before you doing anything else.
                      2014-05-07_11-36-41.png

                      That was easy.
                      2014-05-07_11-37-47.png

                      Cleaning up the unneeded edges inside the islands was a bit more work but no big deal. Then I did what I described before and got this:
                      2014-05-07_11-51-17.png

                      To be honest, I think it would have been easier to draw it from scratch in SketchUp though.

                      Etaoin Shrdlu

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                      • S Offline
                        SungH
                        last edited by

                        Can you teach me how to clean the faces please?

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                        • Dave RD Offline
                          Dave R
                          last edited by

                          I used ThomThom's CleanUp plugin on the parking lot group but when I tried it on the islands it deleted some edges I wanted and left some I didn't want. So I went around to every one of those islands and deleted the unwanted lines with the Eraser. I wonder if your CAD file import contained those unwanted edges or if you created them by doing something in SU.

                          It really would have been easier to just draw two new islands, one for the large ones and one for the small and copy them as needed throughout before performing the steps I outlined originally.

                          Etaoin Shrdlu

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                          • S Offline
                            SungH
                            last edited by

                            Thanks for all your help Dave.

                            I'm working with a huge area of land with thousands of structures and other components and was hoping that Sketchup would make it easy to make 3d models of my needs with ease. I think i overestimated the efficiency of Sketchup.

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                            • Dave RD Offline
                              Dave R
                              last edited by

                              It would be easy if you did it right. But it is a computer program and GIGO applies.

                              Etaoin Shrdlu

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