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Vuforia开发技巧：通过手指拖拽平移模型

AR/VR技术交流群 129340649

前面文章介绍了怎么对3D模型进行缩放、平移和旋转，

《(Unity3d)Vuforia开发基础五-模型交互》

这篇将会介绍如何通过手指拖拽平移模型。

思路：

1、通过绘制射线判断是否选中模型

2、然后根据手指在屏幕上的移动位置变化来移动模型

使用以下脚本，将脚本放到ARCamera下，确保模型具有mesh
Collider 属性。

复制代码

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using UnityEngine;

[size=1em]
using System.Collections;

[size=1em]
public class DragObject
: MonoBehaviour {

[size=1em]
private Transform
pickedObject = null;

[size=1em]
private Vector3
lastPlanePoint;

[size=1em]
//
Use this for initialization

[size=1em]
void Start
() {

[size=1em]
}

[size=1em]
//
Update is called once per frame

[size=1em]
void Update
() {

[size=1em]
//创建一个平面

[size=1em]
      Plane
targetPlane = new Plane(transform.up,
transform.position);

[size=1em]
      foreach (Touch
touch in Input.touches)
{

[size=1em]
         //获取摄像头近平面到屏幕触摸点的射线

[size=1em]
         Ray
ray = Camera.main.ScreenPointToRay(touch.position);

[size=1em]
         //获取射线沿着plane的距离

[size=1em]
         float dist
= 0.0f;

[size=1em]
         targetPlane.Raycast(ray, out dist);

[size=1em]
         //获取沿着射线在距离dist位置的点

[size=1em]
         Vector3
planePoint = ray.GetPoint(dist);

[size=1em]
         //Debug.Log("Point="
+ planePoint);

[size=1em]
         //按下手指触碰屏幕

[size=1em]
         if (touch.phase
== TouchPhase.Began) {

[size=1em]
               RaycastHit
hit = new RaycastHit();

[size=1em]
//
判断是否有碰撞到对象

[size=1em]
               if (Physics.Raycast(ray, out hit,
1000)) {

[size=1em]
                  pickedObject
= hit.transform;

[size=1em]
                  lastPlanePoint
= planePoint;

[size=1em]
               } else {

[size=1em]
                  pickedObject
= null;

[size=1em]
               }

[size=1em]
         //选中模型后拖拽

[size=1em]
         } else if (touch.phase
== TouchPhase.Moved) {

[size=1em]
               if (pickedObject
!= null)
{

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                  pickedObject.position
+= planePoint - lastPlanePoint;

[size=1em]
                  lastPlanePoint
= planePoint;

[size=1em]
               }

[size=1em]
         //释放

[size=1em]
         } else if (touch.phase
== TouchPhase.Ended) {

[size=1em]
               pickedObject
= null;

[size=1em]
         }

[size=1em]
      }

[size=1em]
}

[size=1em]
}

通过前面教程中粗略计算手指在屏幕上的滑动位移也能够用来做类似的效果，只是精度相对来说差一些，需要手动调整。但是调整之后，效果还是挺好的

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using UnityEngine;

[size=1em]
using System.Collections;

[size=1em]
public class DragObject
: MonoBehaviour

[size=1em]
{

[size=1em]
private Transform
pickedObject = null;

[size=1em]
private Vector3
lastPlanePoint;

[size=1em]


[size=1em]
private float x;

[size=1em]
private float y;

[size=1em]
//
移动加权，使移动与手指移动同步

[size=1em]
private float xSpeed
= 2;

[size=1em]
//
Use this for initialization

[size=1em]
void Start()

[size=1em]
{

[size=1em]
}

[size=1em]
//
Update is called once per frame

[size=1em]
void Update()

[size=1em]
{

[size=1em]
      //创建一个平面

[size=1em]
      Plane
targetPlane = new Plane(transform.up,
transform.position);

[size=1em]
      Debug.Log("position=" +
transform.position);

[size=1em]
      foreach (Touch
touch in Input.touches)

[size=1em]
      {

[size=1em]
         //获取摄像头近平面到屏幕触摸点的射线

[size=1em]
         Ray
ray = Camera.main.ScreenPointToRay(touch.position);

[size=1em]
         //获取射线沿着plane的距离

[size=1em]
         float dist
= 0.0f;

[size=1em]
         targetPlane.Raycast(ray, out dist);

[size=1em]
         //获取沿着射线在距离dist位置的点

[size=1em]
         Vector3
planePoint = ray.GetPoint(dist);

[size=1em]
         Debug.Log("Point=" +
planePoint);

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         //按下手指触碰屏幕

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         if (touch.phase
== TouchPhase.Began)

[size=1em]
         {

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            RaycastHit
hit = new RaycastHit();

[size=1em]
            //
判断是否有碰撞到对象

[size=1em]
            if (Physics.Raycast(ray, out hit,
1000))

[size=1em]
            {

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                  pickedObject
= hit.transform;

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                  lastPlanePoint
= planePoint;

[size=1em]
            }

[size=1em]
            else

[size=1em]
            {

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                  pickedObject
= null;

[size=1em]
            }

[size=1em]


[size=1em]
         }//选中模型后拖拽

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         else if (touch.phase
== TouchPhase.Moved)

[size=1em]
         {

[size=1em]
            if (pickedObject
!= null)

[size=1em]
            {

[size=1em]
                  //
设置移动位移

[size=1em]
                  x
= Input.GetAxis("Mouse
X")
* xSpeed;

[size=1em]
                  pickedObject.position
+= new Vector3(x,
0, 0);

[size=1em]
                  //
方法一

[size=1em]
                  //pickedObject.position
+= planePoint - lastPlanePoint;

[size=1em]
                  lastPlanePoint
= planePoint;

[size=1em]
            }

[size=1em]
            //释放

[size=1em]
         }

[size=1em]
         else if (touch.phase
== TouchPhase.Ended)

[size=1em]
         {

[size=1em]
            pickedObject
= null;

[size=1em]
         }

[size=1em]
      }

[size=1em]
}

[size=1em]
}

建议使用第二种方式。第一种方式经过测试，不是很灵敏，可能还需要进一步调整。

更多回帖

李乔

Vuforia开发技巧：通过手指拖拽平移模型

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李乔

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Vuforia SDK4.0开发者使用体验

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HarmonyOS/OpenHarmony应用开发-ArkTS拖拽事件

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