sketchucation logo sketchucation
    • Login
    ℹ️ Licensed Extensions | FredoBatch, ElevationProfile, FredoSketch, LayOps, MatSim and Pic2Shape will require license from Sept 1st More Info

    [Plugin] Center of Gravity

    Scheduled Pinned Locked Moved Plugins
    183 Posts 41 Posters 297.6k Views 41 Watching
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Dave RD Offline
      Dave R
      last edited by

      What method are you using to extend the extrusion? If you are just scaling the group or component, you aren't updating its definition. If you open the group/component for editing and then modify its length, the definition gets changed and the plugin should give you the results you are looking for.

      Etaoin Shrdlu

      %

      (THERE'S NO PLACE LIKE)

      G28 X0.0 Y0.0 Z0.0

      M30

      %

      1 Reply Last reply Reply Quote 0
      • jojo9J Offline
        jojo9
        last edited by

        Great plugin! its possible to add some toolbar buttons? i tried but had no luck.

        #--------- menu -----------------------------
        unless file_loaded?(File.basename(__FILE__))
           txt0="C of G..."
           txt1="Find C of G"
           txt2="Composite C of G"
           dir=File.dirname(__FILE__)+"/TIGtools"
           toolname="CofGravity"
           locale=Sketchup.get_locale.upcase
           path=dir+"/"+toolname+locale+".lingvo"
           if File.exist?(path)
             txt0=deBabelizer(txt0,path)
             txt1=deBabelizer(txt1,path)
             txt2=deBabelizer(txt2,path)
           end#if
           submenu=UI.menu("Plugins").add_submenu(txt0)
           submenu.add_item(txt1){CofGravity.new(1)}
           submenu.add_item(txt2){CofGravity.new(2)}
           
        =begin   
          #plus
         	tb= UI.toolbar "Konstruktion"
         	
        	cmd = UI;;Command.new(txt1) {CofGravity.calculate}
        	cmd.small_icon = "../Images/Center_component_lg.png"
        	cmd.tooltip = "Teilmassen Zentrum"
        	tb.add_item(cmd)
        	
        	cmd1 = UI;;Command.new(txt2) {CofGravity.composite}
        	cmd1.small_icon = "../Images/Center_component_lg_sum.png"
        	cmd1.tooltip = "Hauptmassen Zentrum"
        	tb.add_item(cmd1)   
        =end  
        end#if
        file_loaded(File.basename(__FILE__))
        #---------------------------------
        

        sidenote. unable to format my text as code. I get a weird looking format table (please see attachment)

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

          tb = UI.toolbar**.new**("Konstruktion")
          Makes the new toolbar.
          And use: cmd.small_icon = "Images/Center_component_lg.png"

          • assuming Images in in the same subfolder as the loading RB file ?
            You cannot add a new button to a existing toolbar unless you have just made it, OR if the toolbar has been made during the same start-up session AND it has an enduring reference...
            So in some earlier loading file [they load alphanumerically] use something like:
          module MY_STUFF
            ###
            TOOLBAR = UI.toolbar.new("Konstruktion")
            ###
          end
          

          Then in your second file: tb = MY_STUFF::TOOLBAR Which is an enduring reference to the 'MY_STUFF' toolbar entitled 'Konstruktion'...
          You can then add buttons to that toolbar as SketchUp starts - in any later loading script...

          TIG

          1 Reply Last reply Reply Quote 0
          • 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.

            1 Reply Last reply Reply Quote 0
            • 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!

              1 Reply Last reply Reply Quote 0
              • 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

                1 Reply Last reply Reply Quote 0
                • 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'

                  1 Reply Last reply Reply Quote 0
                  • PockocmocP Offline
                    Pockocmoc
                    last edited by

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

                    1 Reply Last reply Reply Quote 0
                    • 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

                      1 Reply Last reply Reply Quote 0
                      • 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.

                        1 Reply Last reply Reply Quote 0
                        • 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.

                          1 Reply Last reply Reply Quote 0
                          • 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.

                            1 Reply Last reply Reply Quote 0
                            • 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

                                1 Reply Last reply Reply Quote 0
                                • 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

                                  1 Reply Last reply Reply Quote 0
                                  • 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

                                    1 Reply Last reply Reply Quote 0
                                    • 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

                                      1 Reply Last reply Reply Quote 0
                                      • 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

                                        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

                                          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

                                            1 Reply Last reply Reply Quote 0
                                            • 1
                                            • 2
                                            • 5
                                            • 6
                                            • 7
                                            • 8
                                            • 9
                                            • 10
                                            • 7 / 10
                                            • First post
                                              Last post
                                            Buy SketchPlus
                                            Buy SUbD
                                            Buy WrapR
                                            Buy eBook
                                            Buy Modelur
                                            Buy Vertex Tools
                                            Buy SketchCuisine
                                            Buy FormFonts

                                            Advertisement