如何在 ARCore 生成的平面上沿摄像机视图方向移动 object/prefab

Question

我正在使用 LeanTouch+ 平移对象，但它只能根据 android 屏幕在 Y 轴上移动，因此在相机上对象只能上下移动。我想要实现的是能够将物体移动得更远或更靠近相机视图。在 ARCore 中，您首先检测环境，然后将其生成为平面，这就是我需要对象移动到的平面。

此外，如果可能的话，我想在 "detected plane" 上使用 Clamp 来限制比检测到的平面更远的移动

这是我使用 LeanFingerTap 生成 obj 的代码

public void Spawn(LeanFinger finger)
    {
        if (AndyPlanePrefab != null && finger != null)
        {
            // Raycast against the location the player touched to search for planes.
            TrackableHit hit;
            TrackableHitFlags raycastFilter = TrackableHitFlags.PlaneWithinPolygon |
                TrackableHitFlags.FeaturePointWithSurfaceNormal;

            if (Frame.Raycast(finger.ScreenPosition.x, finger.ScreenPosition.y, raycastFilter, out hit))
            {
                if(currentNumberofPrefab<numberOfPrefabsAllowed)
                {
                    currentNumberofPrefab = currentNumberofPrefab + 1;

                    // Use hit pose and camera pose to check if hittest is from the
                    // back of the plane, if it is, no need to create the anchor.
                    if ((hit.Trackable is DetectedPlane) &&
                        Vector3.Dot(FirstPersonCamera.transform.position - hit.Pose.position,
                            hit.Pose.rotation * Vector3.up) < 0)
                    {
                        Debug.Log("Hit at back of the current DetectedPlane");
                    }
                    else
                    {
                        // Choose the Andy model for the Trackable that got hit.
                        if (hit.Trackable is FeaturePoint)
                        {
                            AndyPrefab = AndyPointPrefab;
                        }
                        else
                        {
                            getValue = ItemScrollList.valuePrefab;
                            if (getValue == 1)
                            {
                                AndyPrefab = AndyPlanePrefab[0];
                                Debug.Log("value 1");
                            }
                            else if (getValue == 2)
                            {
                                AndyPrefab = AndyPlanePrefab[1];
                                Debug.Log("value 2");
                            }
                            else if (getValue == 3)
                            {
                                AndyPrefab = AndyPlanePrefab[2];
                                Debug.Log("value 3");
                            }
                            else if (getValue == 4)
                            {
                                AndyPrefab = AndyPlanePrefab[3];
                                Debug.Log("value 4");
                            }
                            else if (getValue == 5)
                            {
                                AndyPrefab = AndyPlanePrefab[4];
                                Debug.Log("value 5");
                            }
                        }

                        // Instantiate Andy model at the hit pose.
                        var andyObject = Instantiate(AndyPrefab, hit.Pose.position, hit.Pose.rotation);
                        //adding tag to andyObject for destroying spawn purposes
                        andyObject.tag = "HomePrefab";

                        // Compensate for the hitPose rotation facing away from the raycast (i.e. camera).
                        andyObject.transform.Rotate(0, k_ModelRotation, 0, Space.Self);

                        // Create an anchor to allow ARCore to track the hitpoint as understanding of the physical
                        // world evolves.
                        var anchor = hit.Trackable.CreateAnchor(hit.Pose);

                        // Make Andy model a child of the anchor.
                        andyObject.transform.parent = anchor.transform;
                    }
                }

            }
        }
    }

Answer 1

您可以通过在 (0, 0, 0).

中创建一个预制件来实现这一点，该预制件具有一个空游戏对象作为父对象，您的对象作为子对象

然后，当您检测到飞机时，您可以使用 Session.GetTrackable 将飞机添加到列表中。然后你可以使用这段代码在检测到的平面的中心实例化你的预制件：

Anchor anchor = m_AllPlanes[0].CreateAnchor(m_AllPlanes[0].CenterPose);
var obj = Instantiate(myPrefab, m_AllPlanes[0].CenterPose);
obj.transform.parent = anchor.transform;

如果你想让它离相机更远或更近，你可以在局部z移动obj。然后你的夹子可以是 m_AllPlanes[0].CenterPose.position.z - m_AllPlanes[0].ExtentZ 到 m_AllPlanes[0].CenterPose.position.z + m_AllPlanes[0].ExtentZ

我建议使用游戏对象创建预制件的原因是为了能够使用本地坐标，因为 ARCore 坐标在每个会话中都会发生变化。

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