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    [Plugin] Center of Gravity

    Scheduled Pinned Locked Moved Plugins
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    • honoluludesktopH Offline
      honoluludesktop
      last edited by

      Wow, SU as a structural engineering engine?

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      • utilerU Offline
        utiler
        last edited by

        @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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        • mitcorbM Offline
          mitcorb
          last edited by

          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

            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

              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

              Link Preview Image
              Density of Wood - The Physics Factbook

              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

                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

                  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

                    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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                    • TIGT Offline
                      TIG Moderator
                      last edited by

                      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

                        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

                          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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                          • TIGT Offline
                            TIG Moderator
                            last edited by

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

                            TIG

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                            • TIGT Offline
                              TIG Moderator
                              last edited by

                              @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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                              • TIGT Offline
                                TIG Moderator
                                last edited by

                                @gaieus said:

                                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.

                                It came from a PM request for a tool to find the perfect lifting point for a delicate piece of restoration stonework...
                                I added the composite tool to combine the CoG's and SP's of assembles of multiple or varying density units...
                                Any more ideas welcome... 😕

                                TIG

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                                • TIGT Offline
                                  TIG Moderator
                                  last edited by

                                  'Composite C of G' is for use only on existing C of G elements - it's used to get a combined C of G for them.
                                  If you have an assembly of parts that all have the same density then you can just make one group of all of them and find the C of G of that one group.
                                  BUT if you have an assembly of parts of different densities you'll need to find the individual C of G's of each of them: then you select these C of G elements [only these, nothing else] and use the Composite C of G tool on them.
                                  You only need to use the Composite C of G tool on the C of G's of parts with different densities that could unexpectedly relocate the assembly's C of G - 'off center' for example... Otherwise group and get the one C of G...

                                  TIG

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                                  • pilouP Offline
                                    pilou
                                    last edited by

                                    No problem i can make the Xray mode by hands 😉

                                    Another thing
                                    Seems "Composite mode" don't works for me 😮

                                    object goup 1(without CoF), object goup 2(without CoF),
                                    group 3 = Group1 + Group 2
                                    Find Cof for group3 ok ☀

                                    object goup 1(with CoF), object goup 2(with CoF)
                                    group 3 = Group1 + Group 2
                                    Composite group 3 not Ok 😞
                                    What I miss?

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

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                                    • pilouP Offline
                                      pilou
                                      last edited by

                                      @unknownuser said:

                                      with different densities

                                      haaaaaaaa ☀
                                      THX! 😎

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

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                                      • C Offline
                                        chrisjk
                                        last edited by

                                        I can't seem to get it to do anything on a Mac..

                                        Chris

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                                        • TIGT Offline
                                          TIG Moderator
                                          last edited by

                                          @chrisjk said:

                                          I can't seem to get it to do anything on a Mac..

                                          Please explain a little more...
                                          What can't you get to work ?
                                          Open the Window > Ruby Console.
                                          Select a group or component instance that has a volume - we are trying to find it's C of G !
                                          Run the tool and answer the dialog's questions...
                                          What happens / doesn't happen ?
                                          What are the messages if any in the Ruby Console...
                                          There is nothing different between a PC and a Mac for this tool [except 'PEBCAK' 😉 ]

                                          TIG

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                                          • D Offline
                                            driven
                                            last edited by

                                            Error: #<NoMethodError: undefined method db' for CofGravity:Class> /Library/Application Support/Google SketchUp 7/SketchUp/Plugins/CofGravity.rb:153:in calculate'
                                            /Library/Application Support/Google SketchUp 7/SketchUp/Plugins/CofGravity.rb:813

                                            learn from the mistakes of others, you may not live long enough to make them all yourself...

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