WebGL 的 Unity 多点触控问题

Question

我正在尝试实现一个可以在场景中旋转和缩放的简单轨道摄像头。我遵循了一些教程，如果我将它构建为 PC Standalone，我可以运行我的程序在 windows 上没有任何问题。如果我将它构建为 WebGL，我的相机在单点触摸（旋转）下仍然可以正常工作，在多点触摸下我有一个奇怪的行为。很难解释，但即使我不移动手指，它也会放大和缩小。是"fuzzy"的王者。它发生在 Firefox 和 Chrome，我测试过的浏览器。

using System.Collections;

使用System.Collections.Generic；使用 UnityEngine；

public class CameraOrbitTouch：MonoBehaviour {

protected Transform _XForm_Camera;
protected Transform _XForm_Parent;

protected Vector3 _LocalRotation;
protected float _CameraDistance = 10f;

// The rate of change of the field of view in perspective mode.
public float perspectiveZoomSpeed = 0.2f;    

public float OrbitDampening = 30f;
public float ScrollDampening = 18f;

public bool CameraDisabled = false;


// Use this for initialization
void Start() {
    this._XForm_Camera = this.transform;
    this._XForm_Parent = this.transform.parent;
}


void LateUpdate() {
    if (Input.GetKeyDown(KeyCode.LeftShift))
        CameraDisabled = !CameraDisabled;

    if (!CameraDisabled)
    {
        //Rotation of the Camera based on Mouse Coordinates
        if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Moved)
        {
            _LocalRotation.x += Input.touches[0].deltaPosition.x ;
            _LocalRotation.y += Input.touches[0].deltaPosition.y;

            //Clamp the y Rotation to horizon and not flipping over at the top
            if (_LocalRotation.y < 0f)
                _LocalRotation.y = 0f;
            else if (_LocalRotation.y > 90f)
                _LocalRotation.y = 90f;


        }

        //Zooming Input from our Mouse Scroll Wheel
        if (Input.touchCount == 2 && Input.GetTouch(0).phase == TouchPhase.Moved && Input.GetTouch(1).phase == TouchPhase.Moved)
        {
            // Store both touches.
            Touch touchZero = Input.GetTouch(0);
            Touch touchOne = Input.GetTouch(1);

            // Find the position in the previous frame of each touch.
            Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
            Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;

            // Find the magnitude of the vector (the distance) between the touches in each frame.
            float prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).magnitude;
            float touchDeltaMag = (touchZero.position - touchOne.position).magnitude;

            // Find the difference in the distances between each frame.
            float deltaMagnitudeDiff = (prevTouchDeltaMag - touchDeltaMag);

            //this._CameraDistance += deltaMagnitudeDiff * -1f;
            this._CameraDistance += deltaMagnitudeDiff * perspectiveZoomSpeed;
            this._CameraDistance = Mathf.Clamp(this._CameraDistance, 1.5f, 100f);
        }
    }

    //Actual Camera Rig Transformations
    Quaternion QT = Quaternion.Euler(_LocalRotation.y, _LocalRotation.x, 0);
    this._XForm_Parent.rotation = Quaternion.Lerp(this._XForm_Parent.rotation, QT, Time.deltaTime * OrbitDampening);

    if ( this._XForm_Camera.localPosition.z != this._CameraDistance * -1f )
    {
        this._XForm_Camera.localPosition = new Vector3(0f, 0f, Mathf.Lerp(this._XForm_Camera.localPosition.z, this._CameraDistance * -1f, Time.deltaTime * ScrollDampening));
    }
}

}

有人能告诉我为什么会这样吗？我的代码有一些错误吗？与 WebGL 和多点触控有某种不兼容吗？感谢您的宝贵时间和回答

Answer 1

好的，我找到问题了。问题是 Windows 7。我在另一台计算机上使用了相同的代码 windows 10，它按预期工作...

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