用两个手指统一旋转相机的轨道

Question

几天来我一直没弄明白。您需要在 phone 上用两根手指使相机围绕某个物体旋转。我用手指转了一圈，它应该会旋转。我找到了一个解决方案，但由于某种原因，相机在旋转过程中经常会抽动，有时会非常强烈地转动，并有一点移动。我怎样才能做得更好？

public void Execute()
    {
        if (_officeModel.Camera.orthographic) return;

        _camera = _officeModel.Camera.transform;

        var pos1 = CreateRaycast(Input.GetTouch(0).position);
        var pos2 = CreateRaycast(Input.GetTouch(1).position);
        var pos1b = CreateRaycast(Input.GetTouch(0).position - Input.GetTouch(0).deltaPosition);
        var pos2b = CreateRaycast(Input.GetTouch(1).position - Input.GetTouch(1).deltaPosition);

        var screenCenter = _officeModel.SelectedObject == null ? CreateRaycast(new Vector3(Screen.width / 2, Screen.height / 2, 0)) : _officeModel.SelectedObject.transform.position; //Get screen center transform
        _camera.RotateAround(screenCenter, Vector3.up, Vector3.SignedAngle(pos2 - pos1, pos2b - pos1b, Vector3.up));
        _officeModel.CameraPos = _camera.position;
    }
    
    private Vector3 CreateRaycast(Vector3 direction)
    {
        RaycastHit hit;
        Vector3 point = Vector3.zero;
        Ray ray = _officeModel.Camera.ScreenPointToRay(direction);
        if (Physics.Raycast(ray, out hit))
            point = hit.point;
        return point;
    }

Answer 1

首先，您应该确保检查有 2 个位置不是开始或结束。

此外，我不会使用光线投射来计算您的旋转角度，因为如果触摸的光线突然错过模型，以及其他奇怪的情况，这会让人很尴尬。

请务必注意 RotateAround 的变化。

public void Execute()
{
    if (_officeModel.Camera.orthographic) return;

    _camera = _officeModel.Camera.transform;

    if (Input.touchCount < 2) 
    {
        return;
    }
    
    Touch touch0 = Input.GetTouch(0);
    switch (touch0.touchPhase) {
        case TouchPhase.Stationary:
            break;
        case TouchPhase.Moved:
            break;
        default: 
            return;
    }

    Touch touch1 = Input.GetTouch(1);
    switch (touch1.touchPhase) {
        case TouchPhase.Stationary:
            break;
        case TouchPhase.Moved:
            break;
        default:
            return;
    }

    var pos1 = touch0.position;
    var pos2 = touch1.position;
    var pos1b = touch0.position - touch0.deltaPosition;
    var pos2b = touch1.position - touch1.deltaPosition;

    // Get screen center transform
    var screenCenter = _officeModel.SelectedObject == null ? CreateRaycast(
            new Vector3(Screen.width / 2, Screen.height / 2, 0)) 
            : _officeModel.SelectedObject.transform.position; 

    _camera.RotateAround(screenCenter, Vector3.up, 
             Vector3.SignedAngle(pos2b - pos1b, pos2 - pos1, Vector3.forward));

    _officeModel.CameraPos = _camera.position;
}

private Vector3 CreateRaycast(Vector3 direction)
{
    RaycastHit hit;
    Vector3 point = Vector3.zero;
    Ray ray = _officeModel.Camera.ScreenPointToRay(direction);
    if (Physics.Raycast(ray, out hit))
        point = hit.point;
    return point;
}

用两个手指统一旋转相机的轨道

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c#

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unity3d