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    [Plugin] Simple Catenary Curve

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    • mitcorbM Offline
      mitcorb
      last edited by

      Hey, CADAddict:
      Glad you mentioned Antonio Gaudi's Familia Sagrada, because that is the first thing I thought of when someone questioned the usefulness of catenary curves, besides suspended cables in equilibrium.
      mitcorb

      I take the slow, deliberate approach in my aimless wandering.

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      • simon le bonS Offline
        simon le bon
        last edited by

        Remus's Catenary suspension bridge


        http://i274.photobucket.com/albums/jj245/Spendauballet/SketchUp/CopyArray018th.jpg

        taken in: Copy Array Along Path tool...have a look.

        (Catenary Curve for the general shape of the bridge. The ropes are handmade using Bezier Spline with only one intermediate point driven in order to simulate the weight of the rope.

        A remark to Remus: Your Catenary Curve is made with only 16 segments. It's probably too few in many cases. It would be better to add the choice of this number( 😉 )

        @jclements said:

        Hey Remus:

        Next step is "chain maker" or "rope maker"..😄

        The first tool exists right now with courtesy of Chris Fullmer :[Plugin] Component Stringer

        😉 simon

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        • thomthomT Offline
          thomthom
          last edited by

          @simon le bon said:

          The first tool exists right now with courtesy of Chris Fullmer :[Plugin] Component Stringer

          I think Remus is talking about a tool to simulate rope or chains - which is not what Chris' tool is doing.

          Thomas Thomassen — SketchUp Monkey & Coding addict
          List of my plugins and link to the CookieWare fund

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          • R Offline
            remus
            last edited by

            @simon le bon said:

            A remark to Remus: Your Catenary Curve is made with only 16 segments. It's probably too few in many cases. It would be better to add the choice of this number( 😉 )

            I'll have a look at it 👍

            http://remusrendering.wordpress.com/

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            • simon le bonS Offline
              simon le bon
              last edited by

              @thomthom said:

              I think Remus is talking about a tool to simulate rope or chains - which is not what Chris' tool is doing.

              Hi thomthom,
              You are rigth! I had probably been taken by the hurry of enjoyment. Chris's "Component Stringer" is a very cool tool, but intending to do a different job.

              We can make a chain with it but it very uneasy and far from perfection!

              @tig said:

              Make half chain link (U) and use this tool then edit that chain and copy/hand the U geometry into an O loop of say 2.2 the original length, now you have your links; us 'make unique' on one of the links, edit it and rotate its contents 90 degrees. Select every other link and replace with this rotated one... a chain... done.


              http://i274.photobucket.com/albums/jj245/Spendauballet/SketchUp/clfCompntStringer005th.jpg


              http://i274.photobucket.com/albums/jj245/Spendauballet/SketchUp/clfCompntStringer006th.jpg

              In such case, it will be better to do this way:


              http://i274.photobucket.com/albums/jj245/Spendauballet/SketchUp/th_CopyArray013th.jpg

              And for making a rope, I'm sure we can do a good job with our same Chris Fullmer's Shape Bender.

              *simon

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              • R Offline
                remus
                last edited by

                Try this, it's untested so give us a shout if it's broken.


                simple_cat_curve.rb

                http://remusrendering.wordpress.com/

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                • simon le bonS Offline
                  simon le bon
                  last edited by

                  Hi Remus, 😉

                  Something is wrong for me. "Simple Catenary Curve" opens and asks the number of segments (cool), but after validation, nothing happens..
                  *s

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                  • R Offline
                    remus
                    last edited by

                    Sorry, it was a silly bug as i was distracted while writing it last night. Hopefully this version should work.


                    simple_cat_curve.rb

                    http://remusrendering.wordpress.com/

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                    • simon le bonS Offline
                      simon le bon
                      last edited by

                      Sorry Remus,
                      Something is still wrong!
                      The Catenary curve is drawn so small that I can't zoom on it.

                      http://i274.photobucket.com/albums/jj245/Spendauballet/SketchUp/CatenaryCurve001.jpg

                      I have reloaded your first one to experiment FredoScale Strech tool to figure out something like my suspension bridge's ropes.

                      seems not bad. I have no mathematic element to say if that remains a Catenary Curve.

                      http://i274.photobucket.com/albums/jj245/Spendauballet/SketchUp/CatenaryCurve002th.jpg

                      *simon

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                      • R Offline
                        remus
                        last edited by

                        No worries, i'll have a look at it this evening and see if i can get it back in working order again.

                        http://remusrendering.wordpress.com/

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                        • atelierpaarA Offline
                          atelierpaar
                          last edited by

                          Hi REmus,
                          I just tryed your Tool "Simple Catenary Curve"
                          After the Dialog-box it seems that no Element was drawn.
                          where is the curve? 😮

                          Uli

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                          • D Offline
                            d12dozr
                            last edited by

                            Uli, its always drawn at the origin...you may need to zoom in close.

                            3D Printing with SketchUp Book
                            http://goo.gl/f7ooYh

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                            • McGyverM Offline
                              McGyver
                              last edited by

                              Thank you for this plugin and also thank you for adding the explanation of what it is for and the Wikpedia link.

                              [Visit My ShareCG Freebie Gallery](http://www.ShareCG.com/pf/full_uploads.php?pf_user_name)

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