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    [Plugin] Center of Gravity

    Scheduled Pinned Locked Moved Plugins
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    • PockocmocP Offline
      Pockocmoc
      last edited by

      I am so stupid πŸ˜’ ... you are right TIG, it was because of the units, obviously! The blade weights 42 grams, so (0.0)42 Kg .

      http://img15.hostingpics.net/pics/610277poidsnonmasse.png

      Thank you for all.

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      • H Offline
        hute_zhaw
        last edited by

        Hi Folks

        I just installed this plugin into SketchUp 2017. It doesn't work as expected for me. The find CofG still works fine as far as I can tell but the Composit CofG returns a ruby error:

        Error; #<TypeError; reference to deleted Group>
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;670;in `entities'
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;670;in `block in do_composite'
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;669;in `each'
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;669;in `do_composite'
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;117;in `initialize'
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;817;in `new'
        /Users/hute/Library/Application Support/SketchUp 2017/SketchUp/Plugins/CofGravity.rb;817;in `block in <top (required)>'
        SketchUp;1;in `call'
        

        Has anybody got a clue how to fix this? It is really a pretty cool plugin and would be a shame if it became unusable.

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        • TIGT Offline
          TIG Moderator
          last edited by

          Thanks for the bug-report.
          I suspect that this is a glitch in the way v2017 handles exploded entities.
          I'll investigate and fix it...

          TIG

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          • TIGT Offline
            TIG Moderator
            last edited by

            Here's v2.0 http://sketchucation.com/pluginstore?pln=CofG Its coding is now compatible with v2017 and it is also signed for use in v2016/v2017 in any loading-policy.

            TIG

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            • H Offline
              hute_zhaw
              last edited by

              Outstanding work TIG, thanks that was quick, I can confirm it works after the upgrade of the plug-in.

              Cheers

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              • J Offline
                jbkbm
                last edited by

                The plugin does not seem to be able to detect hollow spaces. Am I doing something wrong? I am trying to find the CoG of steel assemblies but when it calculates the weight, it includes the space between plates and gives me a number much higher than the actual weight.
                http://imgur.com/a/bIITC

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                • TIGT Offline
                  TIG Moderator
                  last edited by

                  Your image attachment isn't showing.
                  An object needs to be a sensibly formed 'solid' - as reported in Entity Info.
                  Otherwise results can be flaky...
                  'Hollows' are accounted for, if it's a proper solid...

                  If you attach your SKP we can look at it...

                  TIG

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                  • L Offline
                    lsorrentino
                    last edited by

                    Hello All, hello TIG,
                    I want to calculate the center of gravity of a small magnet, but the calculation always report volume = 0 and eventully weight = 0.

                    The plugin works perfectly on my pc with larger objects, the density is 7.6 g/cm3, I'm a newbie with sketchup in general, I'm probably doing something wrong 😞

                    Luca


                    sketchup file


                    screenshot


                    result

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                    • TIGT Offline
                      TIG Moderator
                      last edited by

                      It must be a rounding issue.
                      The object looks like it has no volume to SketchUp, therefore no weight.

                      I'll investigate...

                      TIG

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                      • TIGT Offline
                        TIG Moderator
                        last edited by

                        Yes, I see it.
                        It was never intended for such small objects.
                        It rounds to the nearest cu", so your small object appears to have no volume !
                        I'll look at a way of adjusting it...

                        TIG

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                        • L Offline
                          lsorrentino
                          last edited by

                          Wow, very interesting. Thank you very much!

                          1 Reply Last reply Reply Quote 0
                          • TIGT Offline
                            TIG Moderator
                            last edited by

                            Here's v3.0 https://sketchucation.com/pluginstore?pln=CofG It now reports the Volume/Weight of very small objects with more dp etc...

                            TIG

                            1 Reply Last reply Reply Quote 0
                            • L Offline
                              lsorrentino
                              last edited by

                              Thank you very much, I will use it tomorrow!

                              Luca

                              1 Reply Last reply Reply Quote 0
                              • L Offline
                                lsorrentino
                                last edited by

                                It obviously works!!!

                                Thank you very much TIG, extremely useful plugin.

                                Luca


                                OK

                                1 Reply Last reply Reply Quote 0
                                • L Offline
                                  lsorrentino
                                  last edited by

                                  😞

                                  Other little thing I can't understand.

                                  The little magnets of my previous post goes attached to a wood base that according to sketchup is 4500 mm3, but calculated by CoG is 4000.

                                  The volume of the magnet is ok regardless is far little than the wood base.

                                  Bye,
                                  Luca


                                  s1


                                  s2


                                  sk1

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                                  • L Offline
                                    lsorrentino
                                    last edited by

                                    My feeling is that if the volume is only mantissa, ie 0.04555 cm3 works good, when volume is ie 4.75 cm3 decimal part is truncated.

                                    Luca

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                                    • TIGT Offline
                                      TIG Moderator
                                      last edited by

                                      Must be a glitch somewhere in the 'rounding'...
                                      I'll fix it...

                                      TIG

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                                      • TIGT Offline
                                        TIG Moderator
                                        last edited by

                                        Here's v3.1 https://sketchucation.com/pluginstore?pln=CofG The rounding glitch on some small values is now fixed.
                                        The Volume/Weight now shown with between 1dp and 4dp, suppressing trailing zeros beyond .0 as necessary.

                                        TIG

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                                        • L Offline
                                          lsorrentino
                                          last edited by

                                          It works!

                                          Thank you very much,
                                          Luca

                                          1 Reply Last reply Reply Quote 0
                                          • sketchartist023S Offline
                                            sketchartist023
                                            last edited by

                                            Mine does not show up with the added component information. It just turnes the solid into a bunch of layers (horizontal lining). SU 8 Pro windows 7 64bit


                                            Capture.PNG

                                            1 Reply Last reply Reply Quote 0
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