How do I add object on sphere?

I try find some solution about rotate and calculate position from euler angle.

Now, I have a planet, And I want to add gameobject on the planet's surface when I clicked mouse. I doing something like that...

The object is on the planet,but they all cluster a small range, and they rotate isn't correct....




This is my code with maincamera... can someone help me?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4. public class addObjectonPlanet : MonoBehaviour {
5.      public GameObject parentObj;
6.      public GameObject[] gameObj;
7.      int tag;
8.      Vector3 mEuler;
9.      Vector3 targetPos;
10.      public float radius = 3;
11.      int angleX, angleY, angleZ;
12.      // Use this for initialization
13.      void Start (){
14.  
15.      }
16.      // Update is called once per frame
17.      void Update () {
18.          if (Input.GetButtonDown ("Fire1")) {
19.              angleX = Random.Range (0, 360);
20.              angleY = Random.Range (0, 360);
21.              angleZ = Random.Range (0, 360);
22.              mEuler = new Vector3 (angleX, angleY, angleZ);
23.              targetPos = parentObj.transform.position + mEuler.normalized * radius;
24.              tag = Random.Range (0, 3);
25.              GameObject childObj = Instantiate (gameObj [tag], targetPos, Quaternion.Euler (mEuler)) as GameObject;
26.              childObj.transform.parent = parentObj.transform;
27.          }
28.      }
29. }
30.  

I just want to add object on the planet, Do not need to walk on the planet.

 

Random.onUnitSphere * radius

 

yes, that can get the position on the surface, but how can I rotate the object at correct direction? just bottom on surface.

 

Quaternion.Lookrotation along the same random vector