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    SketchyPhysics3.2 (Dec 2)

    Scheduled Pinned Locked Moved SketchyPhysics
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    • C Offline
      CPhillips
      last edited by

      Yes magnets are effected by the size of an object.

      You can attach files to posts. Look at the bottom of the form and there is an "Upload Attachment" tab.

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      • robintR Offline
        robint
        last edited by

        hi all

        sorry pardon didnt see the tab for uploading

        I was trying to make a chain rotating around 2 sprockets. The chain seems to want to fly apart, its all chaotic? even though its all supposed to be stationary, any ideas

        btw i have su8 and sp3.2 dec2010

        its all good fun but i wish i had more control over the way things work, bit hit and miss at the moment

        btw although bugsplat is a good tool, i dont connect my main machine directly to the net for obvious security reasons, so cannot utilise bs directly. It would be much more convenient if bs made a composite text file stored conveniently which i could gather up and post here to help with su crashes. Its a bit cumbersome at the moment

        cheers robin


        a chain loop goes wrong

        As one door closes another one slams in your face

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        • TIGT Offline
          TIG Moderator
          last edited by

          CPhillips
          Please see here for an 'issue' with group.definition http://forums.sketchucation.com/viewtopic.php?p=300105#p300105 😉

          TIG

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          • robintR Offline
            robint
            last edited by

            hi CP

            thanx for the tip, will see if i can make it so.

            any pointers on where to start on Ruby so i can at least know something of what im doing?

            cheers

            Robint

            As one door closes another one slams in your face

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            • robintR Offline
              robint
              last edited by

              @tig said:

              CPhillips
              Please see here for an 'issue' with group.definition http://forums.sketchucation.com/viewtopic.php?p=300105#p300105 😉

              Hi
              I tried the code but it seemed to make things worse

              Code: Select all
              class Sketchup::Group
              if not Sketchup::Group.method_defined?(:definition)
              def definition() # make it so you can use group.definition
              return(self.entities.parent)
              end
              end#if
              end

              something about a chain sp doesnt like

              Im stuck, my chain flies apart

              robin


              attemtped chain

              As one door closes another one slams in your face

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              • robintR Offline
                robint
                last edited by

                High CP

                I have used Poser 5 in the past and learnt about inverse kinematics and joints

                I think there is a fundamental limitation that prevents you making a chain of joints because the last child joint has to join the first parent so the parent must then become a child. This would be inherently unstable (like positive feedback) which is why the joint flies apart in pieces

                Can anyone confirm my guesswork or poiont me somewhere that a working chain has been made (ie will revolve around a sprocket

                cheers robin

                As one door closes another one slams in your face

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                • H Offline
                  hpnisse
                  last edited by

                  Hey, robint!

                  Your chain works perfect when you set the collision state correct in every single object 😄
                  Re. my chain 1.skp

                  ` /hpnisse`
                  ` Windows 7 U -Sketchup 8 -SketchyPhysics 3.2-Dec2 - from Sweden`

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                  • OxerO Offline
                    Oxer
                    last edited by

                    Hi,
                    I have installed SketchyPhisics 3.2 on Mac with OSX 10.6.6 and SU8 and the plugin don't woks, SU read the plugin, appear the toolbars, you can create the shapes but when you press the play appears a window with this message:
                    Error initializing the Simulation: : uninitialized constant MSketchyPhysics3::SP3xSimulationContext::SPSounds /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/ControllerCommands.rb:777:in `initialize'
                    And in the ruby console this:
                    %(#FF0000)[String doesn't compile: uninitialized constant MSketchyPhysics3::SP3xSimulationContext::SPSounds#<NameError: uninitialized constant MSketchyPhysics3::SP3xSimulationContext::SPSounds>
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/ControllerCommands.rb:777:in `initialize'
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/sketchyphysicstool.rb:727:in `new'
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/sketchyphysicstool.rb:727:in `initialize'
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/sketchyphysicstool.rb:1623:in `new'
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/sketchyphysicstool.rb:1623:in `startphysics'
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/sketchyphysicstool.rb:1650:in `physicsTogglePlay'
                    /Users/Oxer/Library/Application Support/Google SketchUp 8/SketchUp/Plugins/SketchyPhysics3/sketchyphysicstool.rb:1738]
                    I have reinstalled SketchyPhysics3.1 and works.

                    "The result is the end what is important is the process" by Oxer
                    [http://www.oxervision.blogspot.com/(http://www.oxervision.blogspot.com/)]

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                    • robintR Offline
                      robint
                      last edited by

                      @hpnisse said:

                      Hey, robint!

                      Your chain works perfect when you set the collision state correct in every single object 😄
                      [attachment=0:au7zhech]<!-- ia0 -->Re. my chain 1.skp<!-- ia0 -->[/attachment:au7zhech]

                      Hi H

                      Thanks for that tip, the model chain works for me now, but I dont understand how setting the object state to "show collision geometry" makes such a radicle difference?

                      obviously i dont understand this state? I looked on the tutor manual but that wasnt helpful
                      so i am puzzled

                      nice that one can actually make a set of revolving links

                      What we need now is a workable spring (with variable rate and damping). the legacy one only works in sp2.3 not in 3.2. perhaps its work in progress

                      can anyone tell me if joints have a built in friction?

                      A simple pendulum will slowly come to rest, so there must be some restraint or energy loss built in? is this variable?

                      in mechanical systems you need mass, stored energy (spring) and friction (damping) preferably using SI units so as to start physical modelling

                      BTW I was once involved with a brilliant guy who made an amazing music generating prog that allowed exploration of scales, rhythms etc. BUT he was a C++ script magician and his prog became a tangle compost heap of widgets with a poor and almost unusable manual. I tried to help sort out the mess but the guy simply couldnt organise his thoughts in a consistant and methodical manner so his brialliant concepts came to nought as prospective users lost enthusiasm and gave up.

                      If anyone is preparing to organise a proper manual for SP4 then I can offer my 2c worth

                      cheers

                      Robin

                      All good stuff as I had come to a brick wall till now

                      As one door closes another one slams in your face

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                      • robintR Offline
                        robint
                        last edited by

                        hi all

                        Im posting some models that illustrate some points and queries

                        all comments gratefully received

                        Robin


                        [my cone n ball

                        rotates using a motor hinge (when will this become reversible?

                        Two balls used, small one falls to bottom so that larger one is off centre and crawls up the side and out otherwise just drops to bottom.

                        nice demo of centripetal force and a hollow solid](/uploads/imported_attachments/elvl_myconeandball1.skp)


                        [my lift ball

                        tried using lift capsule and got it working, then i moved the capsule and it all fell apart. but now i cannot recreate a lift capsul with a slider or a piston

                        strikes me that a slider is unnecessry as its the same as a piston but without accel and damping figures - so why bother.](/uploads/imported_attachments/E5tW_myliftball.skp)


                        [my rotating box

                        strange that the slider now makes a hinge behave like a servo
                        If you push tha slider to one end then the cube over turns and starts rotating in an erratic manner (like a ball running up and down a valley then gaining enough momentum to over top and run down the next valley.

                        before (maybe in a previous version of SP this feature would behave like a true reversible motor - now it doesnt? what happened

                        also if you get it going full speed one way then throw it into full speed other way, it crashes SU](/uploads/imported_attachments/wXwb_myrotatingbox1.skp)


                        [my spring box

                        cant get the spring to move at all. is it now not supported in sp3.2 ?](/uploads/imported_attachments/IRVt_myspringbox1.skp)

                        As one door closes another one slams in your face

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                        • S Offline
                          solodown
                          last edited by

                          Toujours pas de nouvelles pour faire fonctionner ce plug-in sous Mac OS X 10.5.8 avec Google SketchUp ?

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                          • Z Offline
                            zunkian
                            last edited by

                            Hi!

                            Is there a manual for SketchyPhysics for beginners?
                            If there is one, please upload.
                            Thank you.

                            Andy

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                            • dereiD Offline
                              derei
                              last edited by

                              Indeed a user manual for users that did not used ketchyPhysics before would be nice. I noticed that some beginners tips are to be fond here http://sketchyphysics.wikia.com/wiki/SketchyPhysicsWiki , but I'm sure that version 3.2 have much-much more features than are detailed there.
                              Thanks.

                              DESIGNER AND ARTIST [DEREI.UK](http://derei.uk/l)

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                              • 4 Offline
                                4dHans
                                last edited by

                                Could you do like explosions in a future version? That would be cool! 😍

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                                • M Offline
                                  mickeyao
                                  last edited by

                                  MBP with 10.5.8 Thanks!

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                                  • S Offline
                                    sketchyKev
                                    last edited by

                                    @robint said:

                                    hi all

                                    Im posting some models that illustrate some points and queries

                                    all comments gratefully received

                                    Robin

                                    For the first one (rotating cone) you can make the motor reversible by changing the controller code to (slider('motor8055')-0.5)*2

                                    Using that code the middle position of the slide control is off, full left turns one way and right turns the other way.

                                    For the second one, to create a lift capsule do this:

                                    Create a solid floor.
                                    Place a wheel capsule with built in hinge on the floor.
                                    Place a lift capsule with built in slider on the floor.
                                    Using the JCT click on the hinge joint, then ctrl-click on the slider.
                                    A menu pops up asking if you want to "Create a worm gear..". Click "OK".
                                    Run the simulation and turn the hinge capsule clockwise and the other capsule should rise.

                                    You can build a lift from scratch from components. Just make sure each joint is grouped with the moving objects and joint connected with something static before trying to make the worm gear connection.

                                    For the record a slider is not a piston with the accel and drag values set to zero. A piston with those values will not move.

                                    For the rotating box using a slide controller on a hinge, the program does not recognise a controller called "speed" so it has defaulted to servo behaviour. You can get the same behaviour from a servo by setting min=-180 and max=180. It is known that servos behave badly if you try to get them to complete full circles or more than one circle. There is no need to mess with the hinge controllers as servos and motors are provided.

                                    For the box on a spring, the spring is orientated vertically and does not allow sideways movement or rotation. When you try to drag the box the drag action defaults to horizontal movement. To pull the box up or down inline with the spring you need to hold left-shift on your keyboard while dragging with the left mouse button. Try the spring orientated sideways and it should work fine. The springs are on the stiff side so it is worth playing with the accel and damp settings.

                                    Hope that helps.

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                                    • A Offline
                                      AlainBo
                                      last edited by

                                      There are months now that sketchyphysics 3.2 installs 3.1 !!!

                                      Don't understand this update !?

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                                      • B Offline
                                        bouleaux
                                        last edited by

                                        Hello,
                                        congratulations for this marvellous job !
                                        I'm using sketchup 8 on a Mac Book Pro running on Mac Os 10.5.8
                                        and I would loooove to be able to use sketchyphysics with this computer
                                        any chance ?
                                        thx again

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                                        • OxerO Offline
                                          Oxer
                                          last edited by

                                          @bouleaux said:

                                          Hello,
                                          congratulations for this marvellous job !
                                          I'm using sketchup 8 on a Mac Book Pro running on Mac Os 10.5.8
                                          and I would loooove to be able to use sketchyphysics with this computer
                                          any chance ?
                                          thx again

                                          Hi, bouleaux
                                          I'm a mac user too, the last version 3.2 doesn't work on Mac but the 3.1 version works fine on OSX Leopard with SU 8.
                                          I hope this help you.

                                          "The result is the end what is important is the process" by Oxer
                                          [http://www.oxervision.blogspot.com/(http://www.oxervision.blogspot.com/)]

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                                          • B Offline
                                            bouleaux
                                            last edited by

                                            Hello Oxer, many thanks
                                            I tried to find the 3.1 version, but it doesn't seem to be available for download anymore (on this page : http://code.google.com/p/sketchyphysics/downloads/list)
                                            Do you know of another place to find it ?
                                            Thank again for your answer

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