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Getting started with arfoundation tutorial 10- plane detection and placement

2022-07-29 05:17:00 【suelee_ hm】

Sample source code ：

https://github.com/sueleeyu/ar-plane

from 《ARFoundation Starting from scratch 3-arfoundation project 》 Copy project , continue ：

One 、 Add the component

1. add to AR RayCaset Manager and AR Plane Manager：

Select left Hierarchy-AR Session Origin,Inspector Next click Add Component, Enter and add in sequence AR RayCaset Manager and AR Plane Manager

2. Create a plane prefabs：Hierarchy-‘+’-XR-AR Default Plane,Assets Under the new Prefabs Catalog , Drag the created object to Prefabs Catalog , Delete Hieraychy The next object .

3. Will create the plane Drag the preform to Plane Manager Components ：

4. establish Button Components , name BtnPlane, Used for display / Hide plane ：

Two 、 Write code

1. To write cs Code PlaceManager.cs, Used to place prefabricated parts .

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.EventSystems;

using UnityEngine.XR.ARFoundation;

using UnityEngine.XR.ARSubsystems;



namespace FrameworkDesign.Example

{

  

    public class PlaceManager : MonoBehaviour

    {

        [Header("AR Foundation")] 

        /// <summary>

        /// The active ARRaycastManager used in the example.

        /// </summary>

        public ARRaycastManager m_RaycastManager;





        [Header("UI")]

        [SerializeField]

        [Tooltip("Instantiates this prefab on a plane at the touch location.")]

        GameObject m_PlacedPrefab;// Precast units to be placed 



        /// <summary>

        /// The prefab to instantiate on touch.

        /// </summary>

        public GameObject placedPrefab

        {

            get { return m_PlacedPrefab; }

            set { m_PlacedPrefab = value; }

        }



        [HideInInspector]

        static List<ARRaycastHit> s_Hits = new List<ARRaycastHit>();// Store the detected collision points 

        /// <summary>

        /// The object instantiated as a result of a successful raycast intersection with a plane.

        /// </summary>

        public GameObject spawnedObject { get; private set; }



        void Awake()

        {

            // m_RaycastManager = GetComponent<ARRaycastManager>();// It can also be done through GetComponent Get ARRaycastManager

        }



        bool TryGetTouchPosition(out Vector2 touchPosition)

        {

            if (Input.touchCount > 0)

            {

                touchPosition = Input.GetTouch(0).position;

                return true;

            }



            touchPosition = default;

            return false;

        }



        void Update()

        {

            if (!TryGetTouchPosition(out Vector2 touchPosition))

                return;



            var touch = Input.GetTouch(0);

            const TrackableType trackableTypes =

            TrackableType.FeaturePoint |

            TrackableType.PlaneWithinPolygon;



            if (Input.touchCount == 1 && touch.phase == TouchPhase.Moved)// Move the placed object 

            {



                if (m_RaycastManager.Raycast(touchPosition, s_Hits, trackableTypes))

                {

                    // Raycast hits are sorted by distance, so the first one

                    // will be the closest hit.

                    var hitPose = s_Hits[0].pose;

                    if (spawnedObject != null)

                    {

                        spawnedObject.transform.position = hitPose.position;

                    }                   

                }

            }

            if (Input.touchCount == 1 && touch.phase == TouchPhase.Began)// testing touch begin, stay touch begin Do ray collision detection in 

            {

                //--- Determine whether touch To UI Components ----

                //#if IPHONE || ANDROID

                if (EventSystem.current.IsPointerOverGameObject(Input.GetTouch(0).fingerId))

                //#else

                // if (EventSystem.current.IsPointerOverGameObject())

                //#endif

                //Debug.Log(" Current touch in UI On ");

                {

                    Logger.Log($" Current touch in UI On "+ touch.phase);

                    return;

                }

                else

                {

                    //Debug.Log(" There is currently no touch in UI On ");

                    Logger.Log($" There is currently no touch in UI On "+ touch.phase);

                }



                if (m_RaycastManager.Raycast(touchPosition, s_Hits, trackableTypes))

                {

                    // Raycast hits are sorted by distance, so the first one

                    // will be the closest hit.

                    var hitPose = s_Hits[0].pose;

                    if (spawnedObject == null)

                    {

                        spawnedObject = Instantiate(m_PlacedPrefab, hitPose.position, hitPose.rotation);// Instantiate the preform object 

                    }

                    else

                    {

                        spawnedObject.transform.position = hitPose.position;// Update object status 

                    }

                }

            }              

        }      

    }

}

2.Hierarchy Next Game Next Create Empty, name GameScene, take PlaneManager.cs Mount to it ：

choice ARScene, take AR Session Origin And the prefabricated parts are towed to PlaceManager.cs Parameter column of ：

3. To write ARManager.cs, Used for display / Hide plane information ：

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.XR.ARFoundation;



public class ARManager : MonoBehaviour

{

    [Header("AR Foundation")]

    /// <summary>

    /// The active ARRaycastManager used in the example.

    /// </summary>

    public ARPlaneManager m_ARPlaneManager;



    [HideInInspector]



    /// <summary>

    ///  Currently recognized plane 

    /// </summary>

    List<ARPlane> detectPlanes = new List<ARPlane>();



    /// <summary>

    ///  Whether to display the plane at present 

    /// </summary>

    bool isShowPlane = true;



    #region MonoBehaviour CallBacks



    private void Awake()

    {     

        m_ARPlaneManager = FindObjectOfType<ARPlaneManager>();

    }



    void Start()

    {

        CheckDevice();



        m_ARPlaneManager.planesChanged += OnPlaneChanged;

    }



    private void Update()

    {

        SaveElePolicy();

    }



    void OnDisable()

    {

        m_ARPlaneManager.planesChanged -= OnPlaneChanged;

    }



    #endregion



    //  Enable and disable plane detection 

    //  The program is enabled by default , When enabled, the plane is constantly detected . When it is closed, the new plane will not be detected .

    public void DetectionPlane(bool value)

    {

        m_ARPlaneManager.enabled = value;

        if (m_ARPlaneManager.enabled)

        {

            print(" Plane detection enabled ");

        }

        else

        {

            print(" Plane detection is disabled ");

        }

    }



    //  Show and hide the detected plane  

    public void SwitchPlane()

    {

        isShowPlane = !isShowPlane;



        for (int i = detectPlanes.Count - 1; i >= 0; i--)

        {

            if (detectPlanes[i] == null || detectPlanes[i].gameObject == null)

                detectPlanes.Remove(detectPlanes[i]);

            else

                detectPlanes[i].gameObject.SetActive(isShowPlane);

        }

    }



    /// <summary>

    ///  Get the present AR Whether the session is running , And be tracked ( namely , The device can determine its position and direction in the world ).

    /// </summary>

    public bool Skode_IsTracking()

    {

        bool isTracking = false;



        if (ARSession.state == ARSessionState.SessionTracking)

        {

            isTracking = true;

        }



        return isTracking;

    }





    // stay ARFoundation When a plane is newly discovered , Add the plane to the list , It is convenient for us to control these planes 

    void OnPlaneChanged(ARPlanesChangedEventArgs arg)

    {

        for (int i = 0; i < arg.added.Count; i++)

        {

            detectPlanes.Add(arg.added[i]);

            arg.added[i].gameObject.SetActive(isShowPlane);

        }

    }



    // Check the operating environment of the equipment 

    void CheckDevice()

    {

        if (ARSession.state == ARSessionState.NeedsInstall)

        {

            ShowAndroidToastMessage("AR is supported, but requires an additional install. .");

            Invoke("Quit", 1);

        }

        else if (ARSession.state == ARSessionState.Ready)

        {

            Debug.Log("AR is supported and ready.");

        }

        else if (ARSession.state == ARSessionState.Unsupported)

        {

            ShowAndroidToastMessage("AR is not supported on the current device.");

            Invoke("Quit", 1);

        }

    }



    void ShowAndroidToastMessage(string message)

    {

        AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");

        AndroidJavaObject unityActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");

        if (unityActivity != null)

        {

            AndroidJavaClass toastClass = new AndroidJavaClass("android.widget.Toast");

            unityActivity.Call("runOnUiThread", new AndroidJavaRunnable(() =>

            {

                AndroidJavaObject toastObject = toastClass.CallStatic<AndroidJavaObject>("makeText", unityActivity, message, 0);

                toastObject.Call("show");

            }));

        }

    }



    void Quit()

    {

        Application.Quit();

    }



    /// <summary>

    ///  A power saving setting , When the device fails to find the identification target , Allow the screen to darken after the last period of activation 

    /// </summary>

    void SaveElePolicy()

    {

        if (ARSession.state != ARSessionState.SessionTracking)

        {

            const int lostTrackingSleepTimeout = 15;

            Screen.sleepTimeout = lostTrackingSleepTimeout;

        }

        else

        {

            Screen.sleepTimeout = SleepTimeout.NeverSleep;

        }

    }



}

4. add to ARManager.cs To Hierarchy-Game Next , mount PlaneManager Components ：

5. add to Button Of click event . choice BtnPlane Components , add to Onclick event , Drag the Game, choice Function function ：

Two 、unity Knowledge point

1. Radiographic testing ARRaycastManager：

ARRaycastManager.Raycast(Vector2, List<ARRaycastHit>, TrackableType) .

API：Class ARRaycastManager | AR Foundation | 4.2.3

Be careful ： Not all TrackableType All suffer ARCore and ARKit Provider support .ARCore The provider currently only supports PlaneEstimated、PlaneWithinBounds、PlaneWithinPolygon、FeaturePoint、Image and Depth.