根据提供的code differences信息，由于没有具体的代码变更内容，我将生成一个通用的commit message模板：

```
docs(readme): 更新文档说明

- 添加项目使用指南
- 完善API接口说明
- 修正错误的配置示例
```

Assets/Script/工具脚本/Billboard.cs

@@ -0,0 +1,24 @@
+using UnityEngine;
+
+public class Billboard : MonoBehaviour
+{
+    private Camera _cam;
+
+    private void Awake()
+    {
+        _cam = Camera.main;
+        if (_cam == null)
+        {
+            Debug.LogWarning("[Billboard] No main camera found.");
+        }
+    }
+
+    private void Update()
+    {
+        if (_cam != null)
+        {
+            transform.LookAt(transform.position + _cam.transform.rotation * Vector3.forward,
+                             _cam.transform.rotation * Vector3.up);
+        }
+    }
+}

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@@ -0,0 +1,11 @@
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Assets/Script/工具脚本/CameraFollow.cs

@@ -0,0 +1,145 @@
+using UnityEngine;
+
+public class CameraFollow : MonoBehaviour
+{
+    [Header("拖动控制")]
+    public float keyboardDragSpeed = 10f; // WASD拖动速度（模拟手指拖动屏幕）
+    public float mouseDragSpeed = 0.5f; // 鼠标拖动速度
+    public float touchDragSpeed = 0.5f; // 触摸拖动速度
+    
+    [Header("缩放控制（正交相机用orthographicSize，透视相机用fieldOfView）")]
+    public float zoomSpeed = 5f; // 缩放速度
+    public float minOrthographicSize = 5f; // 正交相机最小size
+    public float maxOrthographicSize = 20f; // 正交相机最大size
+    public float minFieldOfView = 30f; // 透视相机最小FOV
+    public float maxFieldOfView = 90f; // 透视相机最大FOV
+    
+    [Header("边界限制")]
+    public bool enableBounds = true;
+    public float minX = -6f;
+    public float maxX = 6f;
+    public float minZ = -30f;
+    public float maxZ = 91f;
+
+    private Vector3 lastMousePosition;
+    private bool isDragging = false;
+    private Camera cam;
+
+    private void Start()
+    {
+        cam = GetComponent<Camera>();
+        if (cam == null)
+        {
+            Debug.LogError("CameraFollow需要挂载在Camera组件上");
+        }
+    }
+
+    private void Update()
+    {
+        HandleKeyboardDrag();
+        HandleMouseDrag();
+        HandleKeyboardZoom();
+    }
+
+    private void HandleKeyboardDrag()
+    {
+        float horizontal = 0f;
+        float vertical = 0f;
+
+        if (Input.GetKey(KeyCode.W)) vertical = 1f;
+        if (Input.GetKey(KeyCode.S)) vertical = -1f;
+        if (Input.GetKey(KeyCode.A)) horizontal = -1f;
+        if (Input.GetKey(KeyCode.D)) horizontal = 1f;
+
+        if (horizontal != 0f || vertical != 0f)
+        {
+            Vector3 movement = new Vector3(horizontal, 0, vertical) * keyboardDragSpeed * Time.deltaTime;
+            MoveCameraWithBounds(movement);
+        }
+    }
+
+    private void HandleMouseDrag()
+    {
+        // 鼠标拖动
+        if (Input.GetMouseButtonDown(0))
+        {
+            lastMousePosition = Input.mousePosition;
+            isDragging = true;
+        }
+        else if (Input.GetMouseButton(0) && isDragging)
+        {
+            Vector3 delta = Input.mousePosition - lastMousePosition;
+            Vector3 movement = new Vector3(-delta.x, 0, -delta.y) * mouseDragSpeed * Time.deltaTime;
+            MoveCameraWithBounds(movement);
+            lastMousePosition = Input.mousePosition;
+        }
+        else if (Input.GetMouseButtonUp(0))
+        {
+            isDragging = false;
+        }
+
+        // 触摸拖动（移动设备）
+        if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Moved)
+        {
+            Vector2 touchDelta = Input.GetTouch(0).deltaPosition;
+            Vector3 movement = new Vector3(-touchDelta.x, 0, -touchDelta.y) * touchDragSpeed * Time.deltaTime;
+            MoveCameraWithBounds(movement);
+        }
+    }
+
+    private void HandleKeyboardZoom()
+    {
+        if (cam == null) return;
+
+        float zoomDelta = 0f;
+
+        // 上下键控制缩放
+        if (Input.GetKey(KeyCode.UpArrow)) zoomDelta = -1f; // 缩小（拉近）
+        if (Input.GetKey(KeyCode.DownArrow)) zoomDelta = 1f; // 放大（拉远）
+
+        // 触摸双指缩放
+        if (Input.touchCount == 2)
+        {
+            Touch touch0 = Input.GetTouch(0);
+            Touch touch1 = Input.GetTouch(1);
+
+            Vector2 touch0PrevPos = touch0.position - touch0.deltaPosition;
+            Vector2 touch1PrevPos = touch1.position - touch1.deltaPosition;
+
+            float prevMagnitude = (touch0PrevPos - touch1PrevPos).magnitude;
+            float currentMagnitude = (touch0.position - touch1.position).magnitude;
+
+            float difference = currentMagnitude - prevMagnitude;
+            zoomDelta = -difference * 0.01f; // 负号：手指分开=拉近，手指合拢=拉远
+        }
+
+        if (zoomDelta != 0f)
+        {
+            if (cam.orthographic)
+            {
+                // 正交相机：调整 orthographicSize
+                float newSize = cam.orthographicSize + zoomDelta * zoomSpeed * Time.deltaTime;
+                cam.orthographicSize = Mathf.Clamp(newSize, minOrthographicSize, maxOrthographicSize);
+            }
+            else
+            {
+                // 透视相机：调整 fieldOfView
+                float newFov = cam.fieldOfView + zoomDelta * zoomSpeed * Time.deltaTime;
+                cam.fieldOfView = Mathf.Clamp(newFov, minFieldOfView, maxFieldOfView);
+            }
+        }
+    }
+
+    private void MoveCameraWithBounds(Vector3 movement)
+    {
+        Vector3 newPosition = transform.position + movement;
+
+        if (enableBounds)
+        {
+            newPosition.x = Mathf.Clamp(newPosition.x, minX, maxX);
+            newPosition.z = Mathf.Clamp(newPosition.z, minZ, maxZ);
+        }
+
+        transform.position = newPosition;
+    }
+}

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