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[Plugin] Center of Gravity

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  • T Offline
    TIG Moderator
    last edited by 3 Mar 2010, 13:57

    CofG.PNG

    [flash=600,388:3mwm3u75]http://www.youtube.com/v/V3nEtQjRwqU[/flash:3mwm3u75]

    Usage and Download from the PluginStore http://sketchucation.com/resources/pluginstore?pln=CofG

    TIG

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    • T Offline
      TIG Moderator
      last edited by 3 Mar 2010, 14:17

      Here's a Composite C of G, made from the three stone detailing pieces assembled - useful if they are of differing density materials and to be fixed together off site and then handled/lifted on site...
      [Original CofG's hidden for clarity]CompoCofG.PNG

      TIG

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      • T Offline
        TIG Moderator
        last edited by 3 Mar 2010, 15:08

        Here's v1.1 http://forums.sketchucation.com/viewtopic.php?p=229401#p229401
        Accuracy improved.***
        CompoCofG description improved.

        *The shape is now sampled at 0.5% of its height.
        So if it's 1000mm high that is at 5mm c/c
        - this should pick up most fine detail ins and outs in its section.
        Ins and outs in plan are picked up anyway.
        If you do have a weird shape that's say 'combed' in the vertical at very close centers
        then you could turn the shape on its side to get an even more accurate CofG... BUT 99% of the time the default analysis will be sufficient - within a 'mm' or so - considering the variability of natural materials' densities I'd say that "sufficient is fit"...
        🤓

        TIG

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        • M Offline
          MALAISE
          last edited by 3 Mar 2010, 18:12

          Interesting plugin, as far as I can use it in SketchyPhysics.

          Thx TIG

          MALAISE 👍

          La Connaissance n'a de valeur que partagée

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          • T Offline
            TIG Moderator
            last edited by 3 Mar 2010, 18:50

            It was actually made after a request by someone making historical stonework detailing. They needed to find the top Suspension-Point to add a lifting-eye so the delicate pieces can be lifted squarely and simply and bedded in place...
            For that you need the Center of Gravity which gives you six axial SP's...
            🤓

            TIG

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            • D Offline
              Dave R
              last edited by 3 Mar 2010, 18:52

              Very nice TIG. I didn't know I needed this plugin until now. Thanks. 👍

              Etaoin Shrdlu

              %

              (THERE'S NO PLACE LIKE)

              G28 X0.0 Y0.0 Z0.0

              M30

              %

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              • A Offline
                alexschreyer Extension Creator
                last edited by 3 Mar 2010, 21:31

                Thanks, TIG, for expanding into the third dimension. This is a great plugin.

                Cheers, Alex

                Author of "Architectural Design with SketchUp":
                http://sketchupfordesign.com/

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                • H Offline
                  honoluludesktop
                  last edited by 3 Mar 2010, 21:33

                  Wow, SU as a structural engineering engine?

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                  • U Offline
                    utiler
                    last edited by 3 Mar 2010, 23:49

                    @dave r said:

                    Very nice TIG. I didn't know I needed this plugin until now. Thanks. 👍

                    Like Dave, I didn't think i needed this until now.... Looks neat TIG!!

                    purpose/expression/purpose/....

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                    • M Offline
                      mitcorb
                      last edited by 4 Mar 2010, 00:24

                      This item could be very handy. Thank you.

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

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                      • J Offline
                        jonorman
                        last edited by 4 Mar 2010, 22:19

                        I am out off words. This is a plugin Ive been waiting but thought never would come.. Im so greatfull

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                        • W Offline
                          watkins
                          last edited by 5 Mar 2010, 17:22

                          A few useful sites giving densities of building materials etc.

                          Link Preview Image
                          Mass, Weight, Density or Specific Gravity of Bulk Materials

                          Mass, or density, of over 80 different Bulk Materials from bauxite to zinc ore

                          favicon

                          (www.simetric.co.uk)

                          http://www.civl.port.ac.uk/britishsteel/media/BSCM%20HTML%20Docs/Loads%20of%20building%20materials.html

                          302 Found

                          favicon

                          (hypertextbook.com)

                          Link Preview Image
                          Density of Common Building Materials per Cubic Foot

                          These values for density of some common building materials were collected from sites across the Internet

                          favicon

                          (www.rfcafe.com)

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                          • W Offline
                            watkins
                            last edited by 5 Mar 2010, 17:25

                            Forgot to say that TIG's volume calculator (+ density) and CofG calculator give you the complete story when reviewing loads.

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                            • pilouP Offline
                              pilou
                              last edited by 5 Mar 2010, 20:16

                              Damned another very cool tool for ingeniery ☀

                              Frenchy Pilou
                              Is beautiful that please without concept!
                              My Little site :)

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                              • D Offline
                                DSG2k
                                last edited by 7 Mar 2010, 10:06

                                Vista and SketchUp 7.1.6860 . . .

                                Unzip of CoG plugin zip in the plugins folder resulted in a lot of overwrite requests (I just got your Manifold, too). I overwrote the older deBabelizer with the newer one.

                                Now on load a "Load Errors" window pops up, saying:

                                Error Loading File CofGravity.rb
                                undefined method `deBabelizer' for main:Object

                                And the plugin does not appear in the Plugin menu.

                                I don't know Ruby so I didn't actually poke at anything in the code, nor did I see anything obvious to me.

                                Just FYI.

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                                • T Offline
                                  TIG Moderator
                                  last edited by 7 Mar 2010, 10:23

                                  Have you got a file called deBabelizer.rb in the Plugins folder.
                                  If not then please put a copy of it in there***.
                                  You must extract all of the files and sub-folders in a zip file keeping their sub-folders etc.
                                  A good unzip application will do that for you.
                                  Moving files manually leads to problems as they end up in the wrong place.
                                  Unzipping directly into Plugins can cause problems as files seemingly overwritten are not !***
                                  With Vista you are probably best firstly extracting everything into a folder on your Desktop [e.g. 'CofG_1.1'] and then use copy/paste on all of that folder's contents [unchanged], en mass into the Plugins folder...

                                  ***You are on Vista so I suspect you have some access-right problems with your Plugins folder 😒 ❓
                                  The dreaded 'compatibility files' issue - it looks like you put the file into the folder but Vista 'protects you' by putting it into a parallel 'compatibility folder' so you don't actually get to find it, load it etc as it's not really there...
                                  So I recommend you change the access-rights to the folder [properties] so you can write to it without problems...
                                  The deBabelizer.rb file issued with all tools is the same file - you only need one copy in Plugins for any tool that uses it to load and to use it...
                                  🤓

                                  TIG

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                                  • GaieusG Offline
                                    Gaieus
                                    last edited by 7 Mar 2010, 14:03

                                    Hm. This is a very interesting piece of plugin, TIG; thanks!

                                    It immediately brings teaching into my mind - as how you can (for instance) explain the different vectors arising in a Gothic structure for instance. It would be (also) interesting to see how these centers of gravity can interact with each other after a structure is assembled.

                                    Gai...

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                                    • pilouP Offline
                                      pilou
                                      last edited by 7 Mar 2010, 14:53

                                      Why not put the Xray mode at the end of the process?
                                      Because we can't see the CofG when this one is inside a volume 😉
                                      Pilou

                                      Frenchy Pilou
                                      Is beautiful that please without concept!
                                      My Little site :)

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                                      • T Offline
                                        TIG Moderator
                                        last edited by 7 Mar 2010, 20:35

                                        Here's v1.2 http://forums.sketchucation.com/viewtopic.php?p=229401#p229401
                                        with FR lingvo file by Pilou...

                                        TIG

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                                        • T Offline
                                          TIG Moderator
                                          last edited by 7 Mar 2010, 20:35

                                          @unknownuser said:

                                          Why not put the Xray mode at the end of the process?
                                          Because we can't see the CofG when this one is inside a volume 😉
                                          Pilou

                                          You can't set Xray mode on your own ?
                                          Many want just the top SP for lifting, and the weight - so CofG is secondary...
                                          If you want it then you can Xray it...

                                          Sorry if I sound cranky... long week and tomorrow's Monday [aaargh!] 😉

                                          *Vous ne pouvez pas définir le mode Xray sur vos propres?
                                          Beaucoup veulent juste le SP haut pour le levage, et le poids - donc CofG est secondaire ...
                                          Si vous le souhaitez vous pouvez le Xray ...

                                          Désolé si j'ai l'air grognon ... longue semaine et demain lundi [aaargh!];)*

                                          TIG

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