How do I add object on sphere?

Unity Engine
1

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?

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class addObjectonPlanet : MonoBehaviour {
     public GameObject parentObj;
     public GameObject[] gameObj;
     int tag;
     Vector3 mEuler;
     Vector3 targetPos;
     public float radius = 3;
     int angleX, angleY, angleZ;
     // Use this for initialization
     void Start (){
  
     }
     // Update is called once per frame
     void Update () {
         if (Input.GetButtonDown ("Fire1")) {
             angleX = Random.Range (0, 360);
             angleY = Random.Range (0, 360);
             angleZ = Random.Range (0, 360);
             mEuler = new Vector3 (angleX, angleY, angleZ);
             targetPos = parentObj.transform.position + mEuler.normalized * radius;
             tag = Random.Range (0, 3);
             GameObject childObj = Instantiate (gameObj [tag], targetPos, Quaternion.Euler (mEuler)) as GameObject;
             childObj.transform.parent = parentObj.transform;
         }
     }
}

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

2

Random.onUnitSphere * radius

3

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

4

Quaternion.Lookrotation along the same random vector