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    SketchyPhysics3.2 (Dec 2)

    Scheduled Pinned Locked Moved SketchyPhysics
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    • M Offline
      MichaelG.1
      last edited by

      I posted a comment
      [more particularly a plea for help]
      in the newbie forum, yesterday.

      Grateful for any assistance.

      MichaelG.

      Update: 01-01-2011
      ... Having received no response. I finally discovered that my download of SP3.2 was either incomplete or corrupt.
      Now, having downloaded a fresh copy, everything seems to work.

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      • robintR Offline
        robint
        last edited by

        help UI window not working

        Postby robint on Mon Jan 03, 2011 8:59 am
        ive got su8 latest and sp 3.2 installed

        when I try to inspect joints i get the usual info for a hinge (say). when I try to input say accel or a controller name , it accepts them but doesnt do anything - no slider in the run panel

        Ive tried the other tip of clicking on the UI button to exit the UI window to no avail

        I saw a tuorial where it said that you can turn a hinge into a reversible motor by putting accel = 1 and giving the controller a name - which is then supposed to bring up a slider in the run panel - i just get a blank.

        then i go back and look again and just get blank boxes. only restarting su8 will clear the prob but it comes back if I try to change a parameter

        cheers Robin

        ps I havent got so excited since I first used SU4 - this could be a wonderful educational tool if physical values could be added to demonstrate newtons laws for example

        I made a double pendulum the other day, but as already said, there's lots of real world physical attributes to be addressed (eg mass, density, friction, elasticity etc) but its early days

        As one door closes another one slams in your face

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        • robintR Offline
          robint
          last edited by

          Hi guys

          how or where do I post a skp model for discussion

          also i cant post a link here?

          robin

          As one door closes another one slams in your face

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          • robintR Offline
            robint
            last edited by

            This site seems to be moribund, not a lot happening?

            Anyway Ive solved the UI problem

            so all working ok now

            As one door closes another one slams in your face

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            • robintR Offline
              robint
              last edited by

              here my 2c worth for sp 3.2

              if you want to make a reversible motor joint, use the hinge (as per sp2) and set the controller blue box to

              quote slider ( 'anyname' )

              you can see the same construction using the motor joint

              wish I didnt have to waste hours getting to this point.

              Also

              to make magnetic solids work you need to set the ui box status to magnetic
              and the magnetic force to a large value eg +- 1000

              not obvious is it?

              I wonder whether its worth contributing to a wikimanual at5 this stage if thereis going to be an sp4 completely recoded?

              Robin

              As one door closes another one slams in your face

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              • J Offline
                jblively
                last edited by

                @robint said:

                to make magnetic solids work you need to set the ui box status to magnetic
                and the magnetic force to a large value eg +- 1000

                I do believe that magnetic force is also affected by mass and scale. So if the model is very large, you'll need a larger value for magnetic force. If you have a small scale model, you can use a magnetic force of as little as 10 to see results.

                There is so much involved in SP, more documentation would be nice, but i'm just glad we have people here we can chat with who want to help!

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                • pilouP Offline
                  pilou
                  last edited by

                  Does this vervion can works on the V6?

                  Frenchy Pilou
                  Is beautiful that please without concept!
                  My Little site :)

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                  • robintR Offline
                    robint
                    last edited by

                    Hi JB

                    good point

                    afik though there is a density coeff, I dont know how well it correlates to the mass of an object?
                    the apparent mass i governed by the size of the collision shape as set in the rt click physics setting

                    havent figured this tiresome details out yet

                    I have a number of cu4rious physical models i would like to post for discussion (eg double pendulums etc) but havent yet found a way to post these little experiments.

                    It seems daft that one cant attach these on this forum - severly limiting

                    Any ideas?

                    As one door closes another one slams in your face

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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 ?

                                          1 Reply Last reply Reply Quote 0
                                          • 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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