添加插件

Assets/Obi/Samples/Common/SampleResources/Scripts/ObjectDragger.cs

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+using UnityEngine;
+using System.Collections;
+
+namespace Obi.Samples
+{
+    public class ObjectDragger : MonoBehaviour
+    {
+
+        private Vector3 screenPoint;
+        private Vector3 offset;
+
+        void OnMouseDown()
+        {
+            screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);
+            offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
+        }
+
+        void OnMouseDrag()
+        {
+            Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
+            transform.position = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
+        }
+
+    }
+ }