Unity 3D--摄像机平滑跟随（方法二）

 public Transform target = null;
     public float height = 1f;
     public float positionDamping = 3f;
     public float velocityDamping = 3f;
     public float distance = 4f;
     public LayerMask ignoreLayers = -1;

     private RaycastHit hit = new RaycastHit();

     private Vector3 prevVelocity = Vector3.zero;
     private LayerMask raycastLayers = -1;

     private Vector3 currentVelocity = Vector3.zero;

     void Start()
     {
         raycastLayers = ~ignoreLayers;
     }

     void FixedUpdate()
     {
         currentVelocity = Vector3.Lerp(prevVelocity, target.root.rigidbody.velocity, velocityDamping * Time.deltaTime);
         currentVelocity.y = 0;
         prevVelocity = currentVelocity;
     }

     void LateUpdate()
     {
         float speedFactor = Mathf.Clamp01(target.root.rigidbody.velocity.magnitude / 70.0f);
         camera.fieldOfView = Mathf.Lerp(55, 72, speedFactor);
         float currentDistance = Mathf.Lerp(7.5f, 6.5f, speedFactor);

         currentVelocity = currentVelocity.normalized;

         Vector3 newTargetPosition = target.position + Vector3.up * height;
         Vector3 newPosition = newTargetPosition - (currentVelocity * currentDistance);
         newPosition.y = newTargetPosition.y;

         Vector3 targetDirection = newPosition - newTargetPosition;
         if(Physics.Raycast(newTargetPosition, targetDirection, out hit, currentDistance, raycastLayers))
             newPosition = hit.point;

         transform.position = newPosition;
         transform.LookAt(newTargetPosition);

     }

脚本直接赋给摄像机，添加Target就可以。