Homig object

Homing.cs

using UnityEngine;

namespace Citrus.VectorComputes
{
    /// <summary>
    /// 対象を向くように回転しながら前進するオブジェクト
    /// </summary>
    public class Homing : MonoBehaviour
    {
        /// <summary>
        /// 追尾対象
        /// </summary>
        public Transform Target;

        /// <summary>
        /// 追尾速度
        /// </summary>
        public float Speed;

        /// <summary>
        /// 旋回速度
        /// </summary>
        public float AngularSpeed;


        private void Update()
        {
            if (Target == null) UpdateRotation();   //  対象がいないなら直進する
            UpdatePosition();
        }

        /// <summary>
        /// 回転方向を更新する
        /// </summary>
        private void UpdateRotation()
        {
            Vector3 positionDiff = Target.position - transform.position;
            float angleDelta = AngularSpeed * Time.deltaTime;
            transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(positionDiff), angleDelta);
        }

        /// <summary>
        /// 位置を更新する
        /// </summary>
        private void UpdatePosition()
        {
            float speedDelta = Speed * Time.deltaTime;
            transform.position += transform.TransformDirection(transform.forward) * speedDelta;
        }
    }
}