How Does Quaternion.Slerp Achieve Smooth Object Rotation in Unity?

Use Quaternion.Slerp to implement object rotation in Unity

When manipulating objects using the Unity engine, it is critical to understand how to control the rotation of objects over time. This article will explore Quaternion.Slerp, a commonly used method.

The role of Quaternion.Slerp

Quaternion.Slerp is a method for generating a new quaternion that interpolates between two source quaternions. It is often used for smooth rotation of objects as it controls the transition from one rotation to another.

Common misunderstandings

A common misconception about Quaternion.Slerp is that the last parameter (t) represents time. However, this is not the case. The t parameter represents the scale of interpolation between source quaternions. A value of 0 indicates the start of interpolation, and a value of 1 indicates the end of interpolation.

Correct implementation

To rotate an object to a specific angle (90, 180, 270), here is an improved implementation:

public float speed = 0.1F;
private float rotation_x;

void Update()
{
    if (Input.GetButtonDown("Fire1"))
    {
        rotation_x += 90; // 旋转增量为 90 度
        rotation_x = rotation_x % 360; // 保持旋转在 0-360 度之间
    }

    transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.Euler(rotation_x, transform.eulerAngles.y, transform.eulerAngles.z), Time.deltaTime * speed);
}

Other notes

• Lerp-based implementations have limitations when handling rotations, as they may choose longer paths to the desired rotation.
• Consider using dedicated rotation functions or coroutines for smoother, more precise rotation control.
• Always ensure that the t parameter is in the range [0, 1] for correct interpolation.

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