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Assets/SampleScenes/Scripts/PlaceTargetWithMouse.cs

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+using System;
+using UnityEngine;
+
+
+namespace UnityStandardAssets.SceneUtils
+{
+    public class PlaceTargetWithMouse : MonoBehaviour
+    {
+        public float surfaceOffset = 1.5f;
+        public GameObject setTargetOn;
+
+        // Update is called once per frame
+        private void Update()
+        {
+            if (!Input.GetMouseButtonDown(0))
+            {
+                return;
+            }
+            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
+            RaycastHit hit;
+            if (!Physics.Raycast(ray, out hit))
+            {
+                return;
+            }
+            transform.position = hit.point + hit.normal*surfaceOffset;
+            if (setTargetOn != null)
+            {
+                setTargetOn.SendMessage("SetTarget", transform);
+            }
+        }
+    }
+}