Unity3D基于陀螺仪实现VR相机功能

  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，如图：
   
   
   代码如下：

   using UnityEngine;using System.Collections;public class GyroController : MonoBehaviour{    // Fields    private 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);    // Methods    private 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即可。即可使用手机陀螺仪控制相机旋转了。