Unity 3D--摄像机平滑跟随（方法二）_unity prevvelocity-优快云博客

本文提供了一段Unity脚本，用于实现第三人称视角下摄像机跟随目标物体的效果，并可根据目标移动速度调整摄像机距离及视场角。

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。

方法一：http://blog.youkuaiyun.com/tanmengwen/article/details/7995672