@Arjen (Arjen) posted a new topic, subject "Simple swinging rig". It read:

   Hi,
    
    I need to create a ferris-wheel. First it just had to turn at a constant speed, so the cabins on the wheel could easily be pointing downwards with simple Xpresso keeping the Y-axes vertical. Now they want it to come to a sudden stop and maybe start up again. That means the cabins have to swing in response to the sudden motion change. The speed at which the wheel stops will be determined later so keyframing is not an option. I know this can be done with dynamics, with soft-IK and probably a whole lot of other methods, but I cannot seem to find the right information about setting this up.  
    Can anybody point me in the right direction? I'm not exactly new to C4D but the last time I used dynamics was 5 years ago (a domino animation so very different from this one) and I never needed soft-IK before. Every tutorial I can find is about dropping things or character animation, nothing as simple(?) as this…
    
    Thanks,
    
    Arjen

Then @bunter (bunter) said

    I did this
    
    http://www.vimeo.com/8453463
    
    with simple bone chains and soft IK. It was a few years ago now, but I can probably dig out the file if you are interested.
    
    other things that come to mind are the spring constraint and maybe even the jiggle deformer

Then @Arjen (Arjen) said

    That appears to come very close to what I need. I would appreciate it very much if you could post the file.
    
    Thanks in advance!
    
    Arjen

@bunter (bunter) replied

    I have had quick look & don't seem to be able to find the disk. Have to go out now but will look later.

@Arjen (Arjen) replied

    Thanks. I just tried spring constraints but no luck so far.  
    Hope you'll find the project,
    
    Cheers,
    
    Arjen

To which @bunter (bunter) replied

    i've not been able to find the disk so far, but here is a file that might get you started. just press play. make sure auto redraw is on to see the calculations when you stop moving things around.

@bunter (bunter) replied

    actually spline dynamics seems to work even better for this…

Then @Arjen (Arjen) said

    Thanks a lot! This should get me started. Funny thing is this setup is almost the same as one I tried earlier. Almost. Yet your setup works and mine didn't… I''l probably spend too much time figuring out why this is so, but one has to keep learning!
    
    Thanks again,
    
    Arjen

After which, @Arjen (Arjen) added

    Spline dynamics works just as I want it. Tweaking a few settings already does the trick.  
    I'll sleep a lot better now knowing that next monday I can say: “Stop and start? Of course, no problem…”
    
    Thanks for getting me there,
    
    Arjen

@bunter (bunter) replied

    happy to help 
    
    would be nice to see the results when you're done.

Then @Arjen (Arjen) said

    If and when the project is indeed made I will post the results here.
    
    Thanks,
    
    Arjen

Then @CGTalk_Moderation (CGTalk_Moderation) said

    This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.


{'source': 'discourse', 'url': 'https://forums.cgsociety.org/t/simple-swinging-rig/1398628', 'title': 'Simple swinging rig', 'views': 397, 'has_accepted_answer': False, 'word_count': 505, 'like_count': 0, 'reply_count': 9, 'participant_count': 3, 'posts': 12, 'tags': '', 'author': '@Arjen (Arjen)', 'participants': '@Arjen (Arjen), @bunter (bunter), @CGTalk_Moderation (CGTalk_Moderation)', 'image_url': '', 'created_at': '2010-01-23T06:05:49.000Z', 'last_posted_at': '2010-01-23T15:56:02.000Z'}