Unity黑魂学习笔记P2 camera Handler

摄像机控制器

视频地址
复刻的git仓库

 public void FollowTarget(float delta)
 {
     Vector3 targetPosition = Vector3.Lerp(myTransform.position, targetTransform.position, delta / followSpeed);
     myTransform.position = targetPosition;
 }

 public void HandleCameraRotation(float delta, float mouseXInut, float mouseYInput)
 {
     lookAngle += (mouseXInut * lookSpeed) / delta;
     pivotAngle -= (mouseYInput * pivotSpeed) / delta;
     pivotAngle = Mathf.Clamp(pivotAngle, minimumPivot, maximumPivot);

     Vector3 rotation = Vector3.zero;
     rotation.y = lookAngle;
     Quaternion targetRotation = Quaternion.Euler(rotation);
     myTransform.rotation = targetRotation;

     rotation = Vector3.zero;
     rotation.x = pivotAngle;
     targetRotation = Quaternion.Euler(rotation);
     cameraPivotTransform.localRotation = targetRotation;
 }

主要是这么几个东西。首先myTransform是该物体的位置，还有一个pivotTransform和一个cameraTransform。targetTransform就是摄像机要跟随的对象，也即玩家。
pivotTransform是要使用pitch，也即俯仰角的变换，将物体绕X轴旋转。
myTransform使用yaw，即航向，将物体绕Y轴旋转。
这里把摄像机的旋转分离开来更灵活，但是不知道为什么这里的代码会导致旋转摄像机抖得厉害（更新已放在FixedUpdate里了）

抖动解决

        public void HandleCameraRotation(float delta, float mouseXInut, float mouseYInput)
        {
            lookAngle += (mouseXInut * lookSpeed) * delta;
            pivotAngle -= (mouseYInput * pivotSpeed) * delta;
            pivotAngle = Mathf.Clamp(pivotAngle, minimumPivot, maximumPivot);

            Vector3 rotation = Vector3.zero;
            rotation.y = lookAngle;
            Quaternion targetRotation = Quaternion.Euler(rotation);
            myTransform.rotation = targetRotation;

            rotation = Vector3.zero;
            rotation.x = pivotAngle;
            targetRotation = Quaternion.Euler(rotation);
            cameraPivotTransform.localRotation = targetRotation;
        }

将上述 lookAngle += (mouseXInut * lookSpeed) * delta;
pivotAngle -= (mouseYInput * pivotSpeed) * delta;从除delta换成乘delta

        public void FollowTarget(float delta)
        {
            Vector3 targetPosition = Vector3.SmoothDamp(myTransform.position, targetTransform.position, ref cameraFollowVelocity, delta * followSpeed);
            myTransform.position = targetPosition;
            HandleCameraCollisions(delta);
        }

相机跟随也换成乘delta，把lookSpeed和pivotSpeed调大就可以得到平滑的摄像机效果。最好把这两个函数都放在LateUpdate里。

第二次改进
上述方式也还是存在不同程度的旋转时抖动问题，第二次改进改为使用Lerp的方式。

        public void HandleCameraRotation(float delta, float mouseXInut, float mouseYInput)
        {
            lookAngle += (mouseXInut * lookSpeed);
            pivotAngle -= (mouseYInput * pivotSpeed);
            pivotAngle = Mathf.Clamp(pivotAngle, minimumPivot, maximumPivot);

            Vector3 rotation = Vector3.zero;
            rotation.y = lookAngle;
            Quaternion targetRotation = Quaternion.Euler(rotation);
            myTransform.rotation = Quaternion.Slerp(myTransform.rotation, targetRotation, delta);

            rotation = Vector3.zero;
            rotation.x = pivotAngle;
            targetRotation = Quaternion.Euler(rotation);
            cameraPivotTransform.localRotation = Quaternion.Slerp(cameraPivotTransform.localRotation, targetRotation, delta);
        }

第三次改进
改为Lerp后感觉效果还是差点意思，没有特别丝滑的感觉。参考了一些实现后发现使用SmoothDamp效果更好。最终代码如下

      public void HandleCameraRotation(float delta, float mouseXInut, float mouseYInput)
      {
          lookAngle += (mouseXInut * lookSpeed);
          pivotAngle -= (mouseYInput * pivotSpeed);
          pivotAngle = Mathf.Clamp(pivotAngle, minimumPivot, maximumPivot);

         /* Vector3 rotation = Vector3.zero;
          rotation.y = lookAngle;
          Quaternion targetRotation = Quaternion.Euler(rotation);
          myTransform.rotation = Quaternion.Slerp(myTransform.rotation, targetRotation, 0.2f);

          rotation = Vector3.zero;
          rotation.x = pivotAngle;
          targetRotation = Quaternion.Euler(rotation);
          cameraPivotTransform.localRotation = Quaternion.Slerp(cameraPivotTransform.localRotation, targetRotation, 0.2f);*/
          currentRotation = Vector3.SmoothDamp(currentRotation, new Vector3(pivotAngle, lookAngle), ref rotationSmoothVelocity, 0.2f);
          myTransform.eulerAngles = currentRotation;

      }