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Question by JDCustard · Oct 15, 2016 at 06:20 PM · rotationphysicsrigidbodyhingejoint

Get object to rotate freely influenced by gravity

Hello, I am currently making a fairground ride and I want the seats where people sit to spin on a hinge attached to the spinning arm but I want it to be influenced by gravity so how it would rotate in real life. I does anyone know how I can go about this and if its possible using a hinge? The problem I have is that the Axis changes because the main arm is rotating on one axis, then the bit that spins the seats on another axis, then I want the seats to spin freely.

Here is a video of what I am after: https://www.youtube.com/watch?v=aH4-IHRx5Mw

Thanks, if anyone could help that would be amazing!

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avatar image b1gry4n · Oct 15, 2016 at 07:05 PM 0
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Like I said here: http://answers.unity3d.com/questions/1256415/rotation-that-keeps-upright.html#comment-1256800 you need to rotate the object in local space if it is a child.

There is more than one way to achieve what youre after.

  • You could have the object not be a child at all and just update its position.

  • you could have the object rotate towards Vector3.up as described here: http://answers.unity3d.com/questions/587020/how-to-make-plane-rotate-towards-player-and-keep-u.html

  • you could attach a hinge joint : https://docs.unity3d.com/ScriptReference/HingeJoint.html

The best way to get help is to attempt it and show your code. Noone wants to write scripts for you and if they do, they are being extremely nice.

avatar image JDCustard b1gry4n · Oct 16, 2016 at 05:55 PM 0
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@b1gryn4n

void Update () { transform.RotateAround(transform.position, transform.right, Time.deltaTime * 30f);

 }

}

How would I modify this to rotate right until it fully upright?

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