Box2D Forums

Hi guys,

I have a box with a joint on it (with motorEnabled = true on the joint). Turning the motor 'on' makes the box move like a 'fan', which is all good.
Now, I would like to tween this 'fan' from one position to another (say...left to right).
So, what I do is I put these two components (box and the joint) inside a Movieclip and I manually tween this movieclip.
I set the 'tweened' property of both these component to 'checked'.

Unfortunately, I end up getting this error. Just wondering if there is any way to achieve this effect?



I guess I am doing something wrong here.

Attached is the effect I would like.

Thank you, folks.

perhaps setting the type to Kinematic might work?

The "tweened" property for Joints only applies to mouse joints. It indicates that you intend to animate the mouse joint. A tweened mouse joint along with setting angular velocity might achieve the effect you want.

Another approach would be to connect the revolute joint not to the ground but another body of type = Animated, then tween that.

@Prot0wNix:
Thank you for the reply, Sir. However, it didn't work. Perhaps, I just don't know too much about setting things with Kinematic options.



@mayobutter:
Thank you, Sir.

I didn't quiet understand how to go about this one. I couldn't find any angular velocity setting on the tweened mouse joint (on the component inspector panel). I did try a 'tweened mouse joint' (i.e., 'tweened' set to 'true' and type set to 'Mouse' on that joint) and it would just move the box (on which the joint is attached) along the manually tweened path (of the joint), but somehow, setting the 'enableMotor' had no effect on the box, i.e., there was no 'fan' effect. It just felt like an object that is tweened with type set to 'Animated'. However, the box to which the joint is attached did move a little up and down along the path - kinda wobbly movement, which I may add looked pretty cool too , and I included this tween effect in my game as well! haha
Perhaps, I didn't do things properly to follow this approach.


Now, this worked just as I wanted it to work. Perfect!
Thank you.

While we are at it, I might ask one more question.

If I set the 'density' of the box (to which the joint is attached), to say, 20...the box just drops down. It doesn't follow the joint along the tween path.

I am guessing that the joint is not strong enough to hold such a heavy object.
So, how does one make the joint stronger?

Many thanks.