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    SketchyPhysics3.2 (Dec 2)

    Scheduled Pinned Locked Moved SketchyPhysics
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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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                                        • 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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