How Can I Use Quaternion.Slerp to Rotate GameObjects Smoothly in Unity?

Use Quaternion.Slerp to smoothly rotate game objects in Unity

For Unity engine beginners, understanding how to use Quaternion.Slerp for object rotation can be a daunting task. This article will delve into the details of Quaternion.Slerp and provide practical examples of rotating objects to specific angles (90, 180 and 270 degrees).

Understanding Quaternion.Slerp

Quaternion.Slerp interpolates two quaternions over a period of time, smoothly transitioning from one rotation to the other. The key, however, is understanding the "time" parameter. This value (t) ranges from 0 to 1, where t = 0 represents the starting quaternion and t = 1 represents the ending quaternion.

Example: Rotate to a specific angle

Consider the following code snippet:

public float speed = 0.1F;
private float rotation_x;
void Update()
{
    if (Input.GetButtonDown("Fire1"))
    {
        rotation_x = transform.rotation.eulerAngles.x;
        rotation_x += 180;
    }
    transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.Euler(rotation_x, transform.eulerAngles.y, transform.eulerAngles.z), Time.time * speed);
}

The error in this code is the use of Time.time in the Slerp function. Time.time keeps increasing and will eventually exceed 1, causing rotation errors. Instead, use a dedicated time counter to control rotation for a specified duration.

Practical Solutions

void Start()
{
    StartCoroutine(RotateObject(objectToRotate, Quaternion.Euler(new Vector3(0, 0, 90)), 3f)); // 在3秒内旋转到(0, 0, 90)
}

bool rotating = false;
public GameObject objectToRotate;

IEnumerator RotateObject(GameObject gameObjectToMove, Quaternion newRot, float duration)
{
    if (rotating) yield break;
    rotating = true;

    Quaternion currentRot = gameObjectToMove.transform.rotation;
    float counter = 0;

    while (counter < duration)
    {
        counter += Time.deltaTime;
        float t = counter / duration;
        gameObjectToMove.transform.rotation = Quaternion.Slerp(currentRot, newRot, t);
        yield return null;
    }
    rotating = false;
}

In this updated code, the RotateObject coroutine is used to smoothly transition the rotation of the object over a specified duration, eliminating the bug seen in the previous code. This approach allows precise control of rotation angle and duration.

Conclusion

Mastering Quaternion.Slerp is essential for creating dynamic and engaging object rotations in the Unity engine. By understanding the interplay between time and quaternions, developers can achieve seamless transitions and precise rotations, adding depth and realism to their virtual worlds.

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