Box2D Forums • View topic

View unanswered posts | View active topics

Board index » Box2D Ports » WCK

All times are UTC - 8 hours [ DST ]

Tween joints

Page 1 of 1

[ 3 posts ]

Print view

Previous topic | Next topic

Author

Message

chew

Post subject: Tween joints

Posted: Tue Jul 05, 2011 7:14 am

Joined: Tue Jul 05, 2011 7:08 am
Posts: 1

Hi,

Im new to the WCK and have spend most of my day fixing this little problem.

I three joints attached to a box (just like the PlatformSwing in the demo). What i want to do is to animate the box with manual keyframes, but still allow the physical rotation of the box.

I have tried with type of the box set to "Animated", but then it does not rotate anymore.

I have attached a drawing to show what i mean.

Any help is highly appreciated

Thanks!

Attachments:

box2d_question.jpg [ 16.44 KiB | Viewed 619 times ]

Top

goJohnnygo

Post subject: Re: Tween joints

Posted: Thu Jul 07, 2011 10:54 am

Joined: Mon Jun 13, 2011 2:52 pm
Posts: 18

@Chew I couldn't get a tween to work on a joint either. Maybe you could put the animated MC on top of the box and have it follow the b2Body as it swings. But you may get some lags (viewtopic.php?f=19&t=7251). Also matching the rotation could be a pain.

Hmm, I guess this post wasn't that helpful.

Top

mayobutter

Post subject: Re: Tween joints

Posted: Fri Jul 08, 2011 7:44 am

Joined: Fri Dec 14, 2007 8:07 pm
Posts: 913

This is a tough scenario to implement. My first thought is to set the two joints up as distance joints and then manually tweak the length of the distance joints to move it up and down like so:

Code:

(b2joint as b2DistanceJoint).m_length += 1;

Setting the length of distance joints isn't officially supported but I think it works.

Top

Page 1 of 1

[ 3 posts ]

Board index » Box2D Ports » WCK

All times are UTC - 8 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 3 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum