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    [Plugin] Center of Gravity

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

      Oh, and even with a simple cube, (wich is solid) it does the same : no weight...

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      • TIGT Offline
        TIG Moderator
        last edited by

        What version do you have ?
        It should be v1.7 from the SketchUcation PluginStore ?
        It's 3 years old but works on newer SketchUps anyway...

        If you run it with the Ruby Console open are there any error messages ?

        What settings are you using ?

        What is getting reported exactly ?

        Obviously the object's size versus the chosen density units can cause small objects to be reported as 0...
        A small 'blade' probably needs to be in g/cm³ or similar...

        Here's what I get with a component cube with protruding numerals [v2016].
        It's a but over 1 m³ with a density of 2000 kg/m³ at the default 1% accuracy setting it returns a true volume in m³ and a weight in kg...
        A much smaller [scaled] version reports '0' when the overly large units misapplied, but with g/cm³ it's fine...

        Can you post a simple SKP that has issues so I can test it...


        Capture.PNG


        Capture1.PNG

        TIG

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        • BoxB Offline
          Box
          last edited by

          It sounds like you may be creating component, but failing to tick the box that replaces the raw geometry with the component.
          If there is no bounding box around your object it is just raw geometry, see if the component is in the component browser for you ready to use.

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          • PockocmocP Offline
            Pockocmoc
            last edited by

            I am so stupid 😒 ... 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!

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                                • 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

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                                  • L Offline
                                    lsorrentino
                                    last edited by

                                    Thank you very much, I will use it tomorrow!

                                    Luca

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                                    • L Offline
                                      lsorrentino
                                      last edited by

                                      It obviously works!!!

                                      Thank you very much TIG, extremely useful plugin.

                                      Luca


                                      OK

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                                      • 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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