在 ARkit 中，有没有关于 FocusSquare Scene.How 的教程，可以通过类似于 ARHitCubeScene 的方式一键显示模型？

Question

我尝试在 Arkit 示例场景中做一个项目 FoucusSquare.In ArHitCubeTest 当我们触摸时，例如，如果我们添加一个立方体，当立方体成为 HitCubeParent.Similarily 的子级时，它将通过一次触摸来实例化在 FocusSquare Scene 中，我制作了 FoucusSquareFocused.When 的立方体子级，检测到平面它显示了立方体，否则我们看不到它，因为它是 tracking.So 一旦检测到平面，如何一键放置立方体屏幕类似于 ArHitCubeTest 示例。

Answer 1

与大多数问题一样，您可以通过多种方式解决此问题，请注意，我的回答仅提供了基本解决方案，并未考虑 FocusSquare 等的重新初始化。

在此示例中，一旦检测到 ARPlaneAnchor 就会放置一个模型，然后将其禁用。

首先，您可以将模型的 Transform 添加到 FocusSquare Class，例如：

//The Transform Of Our Model To Place
public Transform modelToPlace;

然后添加一个布尔值来判断我们的模型是否已经放置 e.g:

//Boolean Determining Whether Our Model Has Been Placed
public bool modelPlaced = false;

使用这两个变量的示例 FocusSquare Class 可能如下所示：

public class FocusSquare : MonoBehaviour {

public enum FocusState {
    Initializing,
    Finding,
    Found
}

public GameObject findingSquare;
public GameObject foundSquare;

//The Transform Of Our Model To Place
public Transform modelToPlace;

//Boolean Determining Whether Our Model Has Been Placed
public bool modelPlaced = false;

public float maxRayDistance = 30.0f;
public LayerMask collisionLayerMask;
public float findingSquareDist = 0.5f;

private FocusState squareState;
public FocusState SquareState { 
    get {
        return squareState;
    }
    set {
        squareState = value;
        foundSquare.SetActive (squareState == FocusState.Found);
        findingSquare.SetActive (squareState != FocusState.Found);
    } 
}

bool trackingInitialized;

//------------------
//MARK: - Life Cycle
//------------------

void Start () {
    SquareState = FocusState.Initializing;
    trackingInitialized = true;
}


void Update () {

    //If Our Model Hasnt Been Placed Continue Updating The Focus Square
    if (!modelPlaced) {

        Vector3 center = new Vector3 (Screen.width / 2, Screen.height / 2, findingSquareDist);
        var screenPosition = Camera.main.ScreenToViewportPoint (center);
        ARPoint point = new ARPoint {
            x = screenPosition.x,
            y = screenPosition.y
        };

        //We Only Want To Place A Model When The Focus Square Has Detected An ARPlance Acnhor
        ARHitTestResultType[] resultTypes = {
            ARHitTestResultType.ARHitTestResultTypeExistingPlaneUsingExtent, 

        }; 

            foreach (ARHitTestResultType resultType in resultTypes) {
                if (HitTestWithResultType (point, resultType)) {
                    SquareState = FocusState.Found;
                    return;
                }
            }

            //No ARPlaneAnchor Has Been Detected So Continue Updating The Focus Square
            if (trackingInitialized) {
                SquareState = FocusState.Finding;


                if (Vector3.Dot (Camera.main.transform.forward, Vector3.down) > 0) {


                    findingSquare.transform.position = Camera.main.ScreenToWorldPoint (center);


                    Vector3 vecToCamera = findingSquare.transform.position - Camera.main.transform.position;


                    Vector3 vecOrthogonal = Vector3.Cross (vecToCamera, Vector3.up);


                    Vector3 vecForward = Vector3.Cross (vecOrthogonal, Vector3.up);


                    findingSquare.transform.rotation = Quaternion.LookRotation (vecForward, Vector3.up);

                } else {

                    findingSquare.SetActive (false);
                }

            }

        } else {

            //Our Model Has Been Placed So Disable The Focus Square
            findingSquare.SetActive (false);
            foundSquare.SetActive (false);

        }

    }


    /// Performs An SCNHitTest For Any Detected ARPlaneAnchore
    bool HitTestWithResultType (ARPoint point, ARHitTestResultType resultTypes)
    {
        List<ARHitTestResult> hitResults = UnityARSessionNativeInterface.GetARSessionNativeInterface ().HitTest (point, resultTypes);
        if (hitResults.Count > 0) {
            foreach (var hitResult in hitResults) {

                foundSquare.transform.position = UnityARMatrixOps.GetPosition (hitResult.worldTransform);
                foundSquare.transform.rotation = UnityARMatrixOps.GetRotation (hitResult.worldTransform);
                Debug.Log (string.Format ("x:{0:0.######} y:{1:0.######} z:{2:0.######}", foundSquare.transform.position.x, foundSquare.transform.position.y, foundSquare.transform.position.z));

                //An ARPlaneAnchor Has Been Detected So Position Our Model & Set Our Boolean To Indicate It Has Been Placed
                if (!modelPlaced) {

                    modelToPlace.transform.position = UnityARMatrixOps.GetPosition (hitResult.worldTransform);
                    modelToPlace.transform.rotation = UnityARMatrixOps.GetRotation (hitResult.worldTransform);
                    modelPlaced = true;

                }

                return true;
            }
        }
        return false;
    }

}

希望这会为您指明正确的方向...

在 ARkit 中，有没有关于 FocusSquare Scene.How 的教程，可以通过类似于 ARHitCubeScene 的方式一键显示模型？

In ARkit Any tutorial for FocusSquare Scene.How to Show models with one touch similar to ARHitCubeScene?

c#

unity3d

arkit