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    [Plugin] Center of Gravity

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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

          1 Reply Last reply Reply Quote 0
          • 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

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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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                          • 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

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                              • 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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                                  • sketchartist023S Offline
                                    sketchartist023
                                    last edited by

                                    @tig said:

                                    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...

                                    TY for the quick response πŸ˜„
                                    So, the console shows in the attachment.
                                    It initializes, goes through the steps, and gets to call.
                                    Or looks like ruby reads up maybe idk πŸ˜›

                                    The skp is attached also πŸ˜„ Thank you for helping! I notice the ruby icon is not right also, so is it possible it is a ruby issue with SU8 atm?


                                    rubyConsole.PNG


                                    NAMEEXAMPLE.skp

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                                    • TIGT Offline
                                      TIG Moderator
                                      last edited by

                                      Can you please post the top half of the error message [or even better expand the RC window and attach the whole error].
                                      Without all of it, the cryptic second half is somewhat useless...

                                      PS: I confirm that your SKP works fine in v2017/v2018 so it's probably a v8 glitch where making it compatible for the last half dozen updates generated an error in very old ones, like v8.
                                      Unfortunately I don't have v8 loaded any more, but I can try and see what the RC error is, make some tweaks that maintain the current versions' usage and PM you that fixed RB to try and see if that works for you...
                                      If so I'll then republish it...

                                      TIG

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                                      • TIGT Offline
                                        TIG Moderator
                                        last edited by

                                        PS: I'd still like to see the full v8 error, but I've also PM'd you an older version of the RB, which I am hopeful will work in v8 for you...

                                        TIG

                                        robertWanR 1 Reply Last reply Reply Quote 0
                                        • Z Offline
                                          zstadel
                                          last edited by

                                          TIG please help!

                                          The Center of Gravity tool works great, but I can't get Composite C of G to work.

                                          I select two C of G groups,
                                          then I go to Extensions>C of G...>Composite C of G
                                          and it looks as though another group is generated, but it's empty

                                          Running SketchUp Pro 17.2.2554 on MacOS 10.13.4

                                          Thanks for any help you can offer
                                          Zack


                                          1.png


                                          2.png


                                          3.png

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                                          • TIGT Offline
                                            TIG Moderator
                                            last edited by

                                            Works fine for me !
                                            Your objects are quite small and have a small volume/weight.
                                            I'm wondering if the two CofG's combined have zero values ?
                                            If you retry with the Ruby Console open are there any error messages ?
                                            If you try with more appropriate settings in the dialog does it improve ?
                                            What version of CofG are you using ?
                                            The most up to date one from the PluginStore ??

                                            TIG

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