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    SketchyPhysics3.2 (Dec 2)

    Scheduled Pinned Locked Moved SketchyPhysics
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    • P Offline
      phy
      last edited by

      @bossdave said:

      I am running SU8 with wine on Ubuntu with SP3.2. The UI box appears showing: Joint, State, Properties, Shapes , but no details. Same problem withSP3.1. Any ideas what I am missing? Thanks

      There you go http://forums.sketchucation.com/viewtopic.php?f=61&t=33030
      webdialogs don't work in wine without this tweak.

      Tableau de comparaison de Staxyn s'agit d'un mГ©dicament uniquement sur ordonnance.

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      • C Offline
        CPhillips
        last edited by

        @jblively said:

        • New script command setFrameRate overrides physics settings framerate.

        Hello, trying to implement the set frame rate command to get the model to slow down on faster computers so we can anticipate the results.

        Can you let me know the usage and where to put it.

        I've tried setFrameRate=5; in the on tick section and it doesn't seem to make any difference.

        Thanks,

        Joe

        Thats not quite how it works. a frame rate of 5 will make the physics simulation step 5 times before updating the sketchup model. To make it go a little slower you could use a frame rate of 1.

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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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