unity脱卡后使物体显示在屏幕中央

旧城等待， 2022-05-19 01:41 164阅读 0赞

*  直接在ImageTarget下的DefaultTrackableEventHandler脚本中修改
 *  首先在ARCamera下创建一个空的游戏物体并调整z轴距离
 *  需要创建两个对象一个是你需要脱卡后居中的模型一个是空物体
 *  创建一个transform来储存模型初始位置

public GameObject house;//室外场景模型
            public GameObject arempty;//arcamera下的空物体
    
            private Transform housrTransform;//模型的位置

1.在start方法里将模型位置初始化

2.接着需要创建一个Bool值来判断是否脱卡，并且要还需要一个Bool值来判断是否是第一次识别到物体初始值都为false

private bool isFirst = false ;//是否第一次识别到物体
    private bool isTuoKa = false;//是否脱卡

3.在OnTrackingFound()方法里将isFirst设为true；   isTuoKa为false

4.在OnTrackingLost()方法里判断if（！isFirst）则执行两个foreach函数体；否则else使isTuoKa设为true并且将ARCamera下空物体的位置赋给模型，接着令模型的父物体为ARCamera下空物体且位置一样；要想使脱卡后物体面对着你，需要给他固定旋转度，如housrTransform.localEulerAngles = new Vector3(-90, 0, 0)使模型的x轴旋转度为-90度；固定脱卡后大小也是一样调用transform下的localScale方法使之等于new Vector3(   x  , y    ,  z  )三个值

5.这样之后脱卡后就能显示在屏幕中央且能固定位置，但是再次扫描图就不行了；

6.要想再次扫描可以，那么我们创建一个Bool值来判断是否返回这里我用的Tkreturn，初始值为false

7.当isTuoKa为true时，位置什么的全变换完后令Tkreturn为true，之后在OnTrackingFound()方法里再次将父物体变回来，再调整当地的欧拉角的值，但是在固定大小时需要判断Tkreturn是否为true，如果不判断再次扫描时大小不是很大就是很小。

全部代码如下：

/*==============================================================================
    Copyright (c) 2010-2014 Qualcomm Connected Experiences, Inc.
    All Rights Reserved.
    Confidential and Proprietary - Protected under copyright and other laws.
    ==============================================================================*/
    
    using UnityEngine;
    
    namespace Vuforia
    {
        /// <summary>
        /// A custom handler that implements the ITrackableEventHandler interface.
        /// </summary>
        public class DefaultTrackableEventHandler : MonoBehaviour,
                                                    ITrackableEventHandler
        {
            #region PRIVATE_MEMBER_VARIABLES
            public GameObject house;//室外场景模型
            public GameObject arempty;//arcamera下的空物体
    
            private Transform housrTransform;//模型的位置
    
    
            private bool isFirst = false ;//是否第一次识别到物体
            private bool isTuoKa = false;//是否脱卡
            private bool Tkreturn = false;
    
    
            private TrackableBehaviour mTrackableBehaviour;
    
            #endregion // PRIVATE_MEMBER_VARIABLES
    
    
            #region UNTIY_MONOBEHAVIOUR_METHODS
        
            void Start()
            {
                mTrackableBehaviour = GetComponent<TrackableBehaviour>();
                if (mTrackableBehaviour)
                {
                    mTrackableBehaviour.RegisterTrackableEventHandler(this);
                }
                housrTransform = house.transform;
            }
    
            #endregion // UNTIY_MONOBEHAVIOUR_METHODS
    
    
    
            #region PUBLIC_METHODS
    
            /// <summary>
            /// Implementation of the ITrackableEventHandler function called when the
            /// tracking state changes.
            /// </summary>
            public void OnTrackableStateChanged(
                                            TrackableBehaviour.Status previousStatus,
                                            TrackableBehaviour.Status newStatus)
            {
                if (newStatus == TrackableBehaviour.Status.DETECTED ||
                    newStatus == TrackableBehaviour.Status.TRACKED ||
                    newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
                {
                    OnTrackingFound();
                }
                else
                {
                    OnTrackingLost();
                }
            }
    
            #endregion // PUBLIC_METHODS
    
    
    
            #region PRIVATE_METHODS
    
    
            private void OnTrackingFound()
            {
                Renderer[] rendererComponents = GetComponentsInChildren<Renderer>(true);
                Collider[] colliderComponents = GetComponentsInChildren<Collider>(true);
                isFirst = true;
                isTuoKa = false;
                house.transform .position  = this.transform.position;
                housrTransform.SetParent(transform);
                housrTransform.localEulerAngles = new Vector3(0, 180, 0);
                if (Tkreturn)
                {
                    housrTransform.localScale = new Vector3(0.015f, 0.0151f, 0.015f);
                }
                // Enable rendering:
                foreach (Renderer component in rendererComponents)
                {
                    component.enabled = true;
                }
    
                // Enable colliders:
                foreach (Collider component in colliderComponents)
                {
                    component.enabled = true;
                }
    
                Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");
            }
    
    
            private void OnTrackingLost()
            {
                Renderer[] rendererComponents = GetComponentsInChildren<Renderer>(true);
                Collider[] colliderComponents = GetComponentsInChildren<Collider>(true);
                if (!isFirst) {
                   // Disable rendering:
                    foreach (Renderer component in rendererComponents)
                    {
                        component.enabled = false;
                    }
    
                    // Disable colliders:
                    foreach (Collider component in colliderComponents)
                    {
                        component.enabled = false;
                    }
    
                }
                else
                {
                    isTuoKa = true;
                    house.transform.position = arempty.transform.position;//令house的位置等于arcamera下空物体的位置
                    housrTransform.SetParent(arempty.transform);//使父物体为arempet且位置与父物体一样
                    housrTransform.localEulerAngles = new Vector3(-90, 0, 0);//脱卡之后使之面对着你
                    housrTransform.localScale = new Vector3(0.2f, 0.2f, 0.2f);//脱卡之后固定物体大小
                    Tkreturn = true;
                }
                Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
            }
    
            #endregion // PRIVATE_METHODS
        }
    }