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Unity3D基于陀螺仪实现VR相机功能

2020年03月09日  | 移动技术网IT编程  | 我要评论

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。

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