基于Unity3D的相机功能的实现（一）——VR相机

Unity自带陀螺仪功能，今天就利用陀螺仪实现一个VR相机功能。步骤如下：

1. 打开Unity，创建一个新的C#脚本GyroController.cs,并挂在MainCamera游戏对象上，代码如下：

   using UnityEngine;
   using System.Collections;public class GyroController : MonoBehaviour
   {// Fieldsprivate readonly Quaternion baseIdentity = Quaternion.Euler(90f, 0f, 0f);private Quaternion baseOrientation = Quaternion.Euler(90f, 0f, 0f);private Quaternion baseOrientationRotationFix = Quaternion.identity;private Quaternion calibration = Quaternion.identity;private Quaternion cameraBase = Quaternion.identity;private bool debug = true;public static bool gyroAvaiable;private bool gyroEnabled = true;private Quaternion gyroInitialRotation;public static bool gyroOff;private Quaternion initialRotation;private readonly Quaternion landscapeLeft = Quaternion.Euler(0f, 0f, -90f);private readonly Quaternion landscapeRight = Quaternion.Euler(0f, 0f, 90f);private const float lowPassFilterFactor = 0.1f;private Quaternion offsetRotation;private Quaternion referanceRotation = Quaternion.identity;private readonly Quaternion upsideDown = Quaternion.Euler(0f, 0f, 180f);// Methodsprivate void AttachGyro(){this.gyroEnabled = true;this.ResetBaseOrientation();this.UpdateCalibration(true);this.UpdateCameraBaseRotation(true);this.RecalculateReferenceRotation();}private void Awake(){gyroAvaiable = SystemInfo.supportsGyroscope;}private static Quaternion ConvertRotation(Quaternion q){return new Quaternion(q.x, q.y, -q.z, -q.w);}private void DetachGyro(){this.gyroEnabled = false;}private Quaternion GetRotFix(){return Quaternion.identity;}private void RecalculateReferenceRotation(){this.referanceRotation = Quaternion.Inverse(this.baseOrientation) * Quaternion.Inverse(this.calibration);}private void ResetBaseOrientation(){this.baseOrientationRotationFix = this.GetRotFix();this.baseOrientation = this.baseOrientationRotationFix * this.baseIdentity;}protected void Start(){Input.gyro.enabled = true;base.enabled = true;this.AttachGyro();this.initialRotation = base.transform.localRotation;this.gyroInitialRotation = Input.gyro.attitude;}private void Update(){gyroOff = PlayerPrefs.GetInt("gyro-off") == 1;if (this.gyroEnabled ){base.transform.localRotation = Quaternion.Slerp(base.transform.localRotation, this.cameraBase * (ConvertRotation(this.referanceRotation * Input.gyro.attitude) * this.GetRotFix()), 0.5f);//0.1f}}private void UpdateCalibration(bool onlyHorizontal){if (onlyHorizontal){Vector3 toDirection = (Vector3) (Input.gyro.attitude * -Vector3.forward);toDirection.z = 0f;if (toDirection == Vector3.zero){this.calibration = Quaternion.identity;}else{this.calibration = Quaternion.FromToRotation((Vector3) (this.baseOrientationRotationFix * Vector3.up), toDirection);}}else{this.calibration = Input.gyro.attitude;}}private void UpdateCameraBaseRotation(bool onlyHorizontal){if (onlyHorizontal){Vector3 forward = base.transform.forward;forward.y = 0f;if (forward == Vector3.zero){this.cameraBase = Quaternion.identity;}else{this.cameraBase = Quaternion.FromToRotation(Vector3.forward, forward);}}else{this.cameraBase = base.transform.rotation;}}
   }

2. 在相机MainCamera下创建一个新的Camera相机，并改变两个相机的Viewport Rect属性，以将屏幕均分，如图：
3. 在场景中创建一个Cube，效果如图：
4. 保存场景，打包成apk，安装到手机即可。

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