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    [Plugin] Center of Gravity

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    • jojo9J Offline
      jojo9
      last edited by

      TIG, thanks for helping! i got it running, with another loader script, as you said.
      Furthermore, i corrected the call commands.

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      • PockocmocP Offline
        Pockocmoc
        last edited by

        Hi all, I am doing a 3D model in Sketchup 2016 and when trying to use CoG, it gives to me "weight=0.0"... How is it possible?

        Here is how I do :
        I create my 3D object, I select it and press "G" to save it as a single component. Then I select it, and I run CoG, applying a density of 7850 Kg/m3 (c40 steel density). It calculates during 5-6 minutes and finally shows 0.0 ...

        Any idea?

        Thanks!

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        • TIGT Offline
          TIG Moderator
          last edited by

          Is it a 'Solid' object in Entity Info ?

          Without seeing the actual object and the settings you used I can't say what the issue might be.

          TIG

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          • PockocmocP Offline
            Pockocmoc
            last edited by

            Hi 😄 !

            Well, it seems it is not recognized as a solid, because there is no "volume" entry in the Entity Info box.

            Here is a picture :

            http://img15.hostingpics.net/pics/522313Prot3.png

            Thank you.

            Pock'

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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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