unity摄像机滚轮平滑推进放大缩小平移旋转 回答

### Unity中实现摄像机滚轮平滑缩放、平移和旋转的功能 在Unity中，可以通过脚本实现摄像机的平滑缩放、平移和旋转功能。以下是一个完整的解决方案[^1]。 #### 滚轮平滑缩放 通过监听`Input.GetAxis("Mouse ScrollWheel")`获取鼠标滚轮的滚动值，并使用插值函数（如`Mathf.Lerp`或`Vector3.Lerp`）实现平滑效果。 ```csharp public class CameraController : MonoBehaviour { public float zoomSpeed = 5f; // 缩放速度 public float minFieldOfView = 20f; // 最小视野 public float maxFieldOfView = 80f; // 最大视野 void Update() { // 鼠标滚轮缩放 float scroll = Input.GetAxis("Mouse ScrollWheel"); Camera.main.fieldOfView = Mathf.Clamp(Camera.main.fieldOfView - scroll * zoomSpeed, minFieldOfView, maxFieldOfView); } } ``` 此代码实现了基于滚轮的平滑缩放功能，同时限制了视野范围以避免过度放大或缩小[^2]。 #### 平移功能 通过检测鼠标中键拖动来实现摄像机的平移。以下是实现代码： ```csharp public class CameraPan : MonoBehaviour { public float panSpeed = 0.05f; // 平移速度 private Vector2 MouseOffsetSincePreviousFrame; private Vector2 currentScreenPos; private Vector2 previousScreenPos; void Update() { if (Input.GetMouseButtonDown(2)) { previousScreenPos = Input.mousePosition; } if (Input.GetMouseButton(2)) { currentScreenPos = Input.mousePosition; MouseOffsetSincePreviousFrame = currentScreenPos - previousScreenPos; transform.position += (MouseOffsetSincePreviousFrame.x * -transform.right + MouseOffsetSincePreviousFrame.y * -transform.up) * panSpeed; previousScreenPos = currentScreenPos; } } } ``` 此代码实现了鼠标中键拖动时的平移功能，确保摄像机能够平稳移动[^2]。 #### 旋转功能 通过检测鼠标右键拖动来实现摄像机的旋转。以下是实现代码： ```csharp public class CameraRotate : MonoBehaviour { public float rotateSpeed = 2f; // 旋转速度 void Update() { if (Input.GetMouseButton(1)) { float mouseX = Input.GetAxis("Mouse X") * rotateSpeed; float mouseY = Input.GetAxis("Mouse Y") * rotateSpeed; transform.RotateAround(transform.position, Vector3.up, mouseX); transform.RotateAround(transform.position, transform.right, -mouseY); } } } ``` 此代码实现了鼠标右键拖动时的旋转功能，同时保持摄像机与目标物体的相对距离不变[^1]。 #### 综合实现 将上述功能整合到一个脚本中，可以实现完整的摄像机控制功能： ```csharp public class CameraControl : MonoBehaviour { public float zoomSpeed = 5f; // 缩放速度 public float rotateSpeed = 2f; // 旋转速度 public float panSpeed = 0.05f; // 平移速度 public float minFieldOfView = 20f; // 最小视野 public float maxFieldOfView = 80f; // 最大视野 private Vector2 MouseOffsetSincePreviousFrame; private Vector2 currentScreenPos; private Vector2 previousScreenPos; void Update() { // 滚轮缩放 float scroll = Input.GetAxis("Mouse ScrollWheel"); Camera.main.fieldOfView = Mathf.Clamp(Camera.main.fieldOfView - scroll * zoomSpeed, minFieldOfView, maxFieldOfView); // 中键平移 if (Input.GetMouseButtonDown(2)) { previousScreenPos = Input.mousePosition; } if (Input.GetMouseButton(2)) { currentScreenPos = Input.mousePosition; MouseOffsetSincePreviousFrame = currentScreenPos - previousScreenPos; transform.position += (MouseOffsetSincePreviousFrame.x * -transform.right + MouseOffsetSincePreviousFrame.y * -transform.up) * panSpeed; previousScreenPos = currentScreenPos; } // 右键旋转 if (Input.GetMouseButton(1)) { float mouseX = Input.GetAxis("Mouse X") * rotateSpeed; float mouseY = Input.GetAxis("Mouse Y") * rotateSpeed; transform.RotateAround(transform.position, Vector3.up, mouseX); transform.RotateAround(transform.position, transform.right, -mouseY); } } } ``` 此代码综合了滚轮缩放、平移和旋转功能，提供了完整的摄像机控制体验[^1]。 ---