Avoiding Gimbal Lock

[aliakbo]

Hey,

I am stuck trying to rotate an object around the X axis. I have tried numerous approaches but I have not been able to rotate the object past 90 and 270 angle. I have converted all my code to quaternions but whatever I do, I cannot get it to work.

This is my current code, I would appreciate it if someone could point out where I am going wrong. Thanks

void Update () 
    {
        //get inputs
        pitch = Input.GetAxis("Pitch") * (Time.deltaTime * pitchSpeed);
        yaw = Input.GetAxis("Yaw") * (Time.deltaTime * yawSpeed);
        roll = Input.GetAxis("Roll") * .5f;

        //implement throttle
        thrust += Input.GetAxis("Throtle") * (Time.deltaTime * throtleSpeed);
        thrust = Mathf.Clamp(thrust, 10000, 60000);

        //smoothen rotaions
        smoothPitch = Mathf.LerpAngle(smoothPitch, pitch, Time.deltaTime * pitchSmoothness);
        smoothYaw = Mathf.LerpAngle(smoothYaw, yaw, Time.deltaTime * yawSmoothness);
        smoothRoll = Mathf.LerpAngle(smoothRoll, roll , Time.deltaTime * yTurnSmoothness);

        //gameobject rotation
        myTransform.rotation *= Quaternion.Euler(-smoothPitch, smoothRoll + smoothYaw, 0);
        //Have also tried this-
        //myTransform.Rotate(-smoothPitch, smoothRoll + smoothYaw, 0);

        //add thrust
        myRigidbody.velocity = myTransform.forward * (Time.deltaTime * thrust);

    }

[Hoeloe]

I think the issue is that you’re directly modifying the Euler angles - removing any benefit you get from having them internally stored as Quaternions. When you get the eulerAngles vector, or use Quaternion.Euler, you are essentially taking the representation in 3-dimensions and converting it to a quaternion. Much the same as if you convert a Vector2 to a Vector3, you don’t gain any information by doing this, and so you lose the benefits of the Quaternion.

Instead of modifying the Quaternion via the Euler angles, try using the Quaternion.RotateAround method. This allows you to rotate the Quaternion around a specified axis, without every converting it to the Euler representation (and thus avoid Gimbal Lock). If you call this 3 times, one for each spacial axis, you should get the effect you want.

[zombience]

try Quaternion.AngleAxis

	public int xRot = 0;

	void Update () 
	{
		transform.rotation = Quaternion.AngleAxis(xRot, transform.right);
		xRot++;
		xRot = (int)Mathf.Repeat(xRot, 360);
	}