模型来回移动

using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class MovingPlatform : MonoBehaviour
{
 public float speed;
 public Transform start;
 public Transform end;
 
 private Vector3 startPos;
 private Vector3 endPos;
 private float distance;
 private Vector3 direction;
 
 private Rigidbody rb;
 
 
 public void Awake()
 {
  rb = rigidbody;
  rb.isKinematic = true;
  startPos = start.position;
  endPos = end.position;
  distance = Vector3.Distance(endPos, startPos);
  direction = Vector3.Normalize(endPos - startPos);
 }
 
 public void FixedUpdate ()
 {
  rb.MovePosition(Mathf.PingPong(Time.time*speed, distance)*direction + startPos);
 }
}