I need to display 3d model for each target. I need to display cow for stones target, elephant for tarmac target. But when i open the camera the models are showing on the overlay. I tried with swap. But the swap when i click the button it remove the model. But i don't want to with button click. When i point to stones need to display only cow, when i point to tarmac need to display elephant. I use one scene. I choosed Dataset, ImageTarget for stones. Then drag the cow. Then choosed tarmac in Dataset then drag the elephant . But when i point to stones or tarmac the 2 models are showing. I searched for swap the model. Also i wrote the code for swap:

using UnityEngine;

using System.Collections;

public class ModelSwapper : MonoBehaviour {

// public TrackableBehaviour theTrackable;

private GameObject theTrackable;

private GameObject cube;

    private bool mSwapModel = false;

public Transform MyPrefab;

// Use this for initialization

void Start () {

theTrackable=GameObject.Find("Cow N050213");

          cube = GameObject.Find("Cow N050213");

if (theTrackable == null)

        {

            Debug.Log ("Warning: Trackable not set !!");

        }

}

// Update is called once per frame

void Update () {

if (mSwapModel && theTrackable != null) {

            SwapModel();

            mSwapModel = false;

        }

}

void OnGUI() {

        if (GUI.Button (new Rect(50,50,120,40), "Swap Model")) {

            mSwapModel = true;

        }

    }

    private void SwapModel() 

    {     

        GameObject trackableGameObject = theTrackable.gameObject;

        //disable any pre-existing augmentation

        for (int i = 0; i < trackableGameObject.transform.GetChildCount(); i++) 

        {

            Transform child = trackableGameObject.transform.GetChild(i);

            child.gameObject.active = false;            

        }

        // Create a simple cube object 

        //GameObject model = GameObject.CreatePrimitive(PrimitiveType.Cube);

        if (MyPrefab != null)

        {

            Transform model = GameObject.Instantiate(MyPrefab) as Transform;

            // Re-parent the model as child of the trackable gameObject

            model.parent = theTrackable.transform;

            // Adjust the position and scale 

            // so that it fits nicely on the target

            model.transform.localPosition = new Vector3(0,0.2f,0);

            model.transform.localRotation = Quaternion.identity;//you might need to adjust the rotation

            model.transform.localScale = new Vector3(0.01f, 0.01f, 0.01f);

            // Make sure it is active

            model.active = true;

        }

    }

}