Instantiate a Prefab along the surface of another GameObject (Sphere)

Questions & Answers
1

I'm trying to instantiate a prefab randomly along the surface of another object, in my case its a sphere, I have no idea how to go about such a thing.

       var grass : GameObject;

        function Start() {
             var grassNum = Random.Range(300, 400);
             for (var i = 0; i < grassNum; i++){
                var position = Vector3(Random.Range(-5.0, 5.0), 0.5, Random.Range(-5.0, 5.0));
                var grassScale : float = Random.Range(0.1,0.3);
                var tempObj = Instantiate(grass, position, Quaternion.identity);
                tempObj.transform.eulerAngles.y = Random.Range(0, 360);
             }

}

Cheers - C

2

You can use Random.onUnitSphere to generate random positions for the objects.

Generating the orientation is a little trickier. The easiest solution would probably be to use Quaternion.FromToRotation() to generate a rotation that rotates the 'up' vector for each object into alignment with the surface normal. (The surface normal will simply be the return value of Random.onUnitSphere prior to any scaling that you apply.)