Mathf.MoveTowardsAngle

Description

То же что MoveTowards, но гарантирует правильную интерполяцию значения, когда оно обернулось на 360 градусов.

Variables current and target are assumed to be in degrees. For optimization reasons, negative values of maxDelta are not supported and may cause oscillation. To push current away from a target angle, add 180 to that angle instead.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float target = 270.0F;
    public float speed = 45.0F;
    void Update() {
        float angle = Mathf.MoveTowardsAngle(transform.eulerAngles.y, target, speed * Time.deltaTime);
        transform.eulerAngles = new Vector3(0, angle, 0);
    }
}