Rotating without gimbal lock

Questions & Answers
1

Hey folks,

So I’ve taken a look around at a lot of the unity answers regarding this issue, but I can’t seem to get my head round it.

I’ve got a directional light in the center of my scene (my sun) and I’m attempting to have it Rotate 360 degrees on the x axis, while also rising and falling in the sky on the y axis. However, part the way through the rotation I’m losing control of the rotate. Perhaps someone could enlighten me?

This is the 24 hour rotation I am attempting to mimic: http://www.gdargaud.net/Antarctica/DC2005/Pano/SunRun_.jpg

	if (SunUp == true) 
	{
		sun.transform.RotateAround(sun.position, Vector3.right, 10 * Time.deltaTime);
		sun.transform.RotateAround(sun.position, Vector3.up, 10 * Time.deltaTime);
	}

	if (SunUp == false) 
	{
		sun.transform.RotateAround(sun.position, Vector3.left, 10 * Time.deltaTime);
		sun.transform.RotateAround(sun.position, Vector3.up, 10 * Time.deltaTime);
	}
2

Managed to solve it in the end! For those interested below is the answer:

public Transform sun;

public float yrot = 0;
public float xrot = 0;


private bool SunUp;

// Use this for initialization
void Start () {

	SunUp = true;

}

// Update is called once per frame
void Update () {

	if (sun.transform.rotation.eulerAngles.x >= 30)
	{
		SunUp = false;
	}

	if (sun.transform.rotation.eulerAngles.x <= 10)
	{
		SunUp = true;
	}


	if (SunUp == true) 
	{
		xrot = xrot + 10 * Time.deltaTime;
	}

	if (SunUp == false) 
	{
		xrot = xrot - 10 * Time.deltaTime;
	}

	yrot = yrot + 10 * Time.deltaTime;

	sun.transform.eulerAngles = new Vector3(xrot, yrot, 0);

	Debug.Log ("Sun Up: " + SunUp);
	Debug.Log ("ypos: " + yrot + "xrot: " + xrot);

}