Torque Swing Limitation

Unity Engine
1

Hello community!

I’ve got an object that swings from left to right using AddTorque.

Now, the real Machine has 3 buttons;
Button 1 = Swing left to right, no higher than 45 Degrees.
Button 2 = Swing left to right, no higher than 90 Degrees.
Button 3 = Swing left to right, no higher than 180 Degrees.

gameObject.AddComponent("HingeJoint");

hingeJoint.anchor = Vector3 (0,0,0);
hingeJoint.axis = Vector3.right;

function FixedUpdate () {

rigidbody.mass = 5;
rigidbody.drag = 0.05;
rigidbody.angularDrag = 0.05;

    if (Input.GetKey("q")) {
       rigidbody.AddTorque (0.2, 0, 0);
    }else{
       rigidbody.AddTorque (0, 0, 0);
    }
   
    if (Input.GetKey("e")) {
       rigidbody.AddTorque (-0.2, 0, 0);
    }else{
       rigidbody.AddTorque (0, 0, 0);
    }
}

As you can see, it pushes the object to the left with Q, and right with E, up to a full over-the-top rotation swing.

What I am looking for;

Press button ‘1’ (ONCE, not hold it)
Arm starts to swing with 0.2 Torque from left to right, until it reached its allowed swing height of 45 Degrees, and keeps swinging on that height, and NO higher.

Example video; http://www.youtube.com/watch?v=2smT3quuiRI

The movement is done automatically, just press either 1,2 or 3 and it off it goes!

Thanks in advance!!!

2

You might find it easier to use a hinge joint for this. The joint has limits on its range of angular motion and also has a motor. You can change the values of these properties from the joint’s script API to create the right action from the inputs.