【Vuforia官方文档】在Unity中拖拽增强现实物体

using UnityEngine;
using System.Collections;
public class DragObject : MonoBehaviour {
   public GUIText message = null;
   private Transform pickedObject = null;
   private Vector3 lastPlanePoint;
   // Use this for initialization
   void Start () {
   }
   // Update is called once per frame
   void Update () {
        Plane targetPlane = new Plane(transform.up, transform.position);
        //message.text = "";
        foreach (Touch touch in Input.touches) {
            //获取屏幕被触碰位置的射线。
            Ray ray = Camera.main.ScreenPointToRay(touch.position);
            //沿着平面得到射线的位置
            float dist = 0.0f;
            //计算射线与这个平面的交点. Sets dist to distance along the ray where intersects
            targetPlane.Raycast(ray, out dist);
            //Returns point dist along the ray.
            Vector3 planePoint = ray.GetPoint(dist);
            //Debug.Log("Point=" + planePoint);
            //True if finger touch began. If ray intersects collider, set pickedObject to transform 
                of collider object
            if (touch.phase == TouchPhase.Began) {
                 //Struct used to get info back from a raycast
                 RaycastHit hit = new RaycastHit();
                 if (Physics.Raycast(ray, out hit, 1000)) { //True when Ray intersects colider. 
                 If true, hit contains additional info about where collider was hit
                     pickedObject = hit.transform;
                     lastPlanePoint = planePoint;
                 } else {
                     pickedObject = null;
                 }
            //Move Object when finger moves after object selected.
            } else if (touch.phase == TouchPhase.Moved) {
                 if (pickedObject != null) {
                     pickedObject.position += planePoint - lastPlanePoint;
                     lastPlanePoint = planePoint;
                 }
            //Set pickedObject to null after touch ends.
            } else if (touch.phase == TouchPhase.Ended) {
                 pickedObject = null;
            }
        }
   }
}

把以上代码放在ARCamera下，让用户可以触碰拖拽物体，前提是这个物体需要有mesh collider.