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    [Plugin] Center of Gravity

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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

        1 Reply Last reply Reply Quote 0
        • 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 ๐Ÿ˜ž

                  Luca


                  sketchup file


                  screenshot


                  result

                  1 Reply Last reply Reply Quote 0
                  • 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

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                          • 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

                                ๐Ÿ˜ž

                                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

                                    1 Reply Last reply Reply Quote 0
                                    • 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

                                      1 Reply Last reply Reply Quote 0
                                      • 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

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                                          • TIGT Offline
                                            TIG Moderator
                                            last edited by

                                            Version 8 is by now pretty much unsupported, but it should still work.
                                            If you have the Ruby Console open what errors do you see when it fails ?
                                            It's clearly doing its temporary slicing to get the centroid... but not completing...

                                            How big is this object ?

                                            Can you upload the SKP you are having issues with...

                                            TIG

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