유니티(Unity) | Random Point Inside Sphere

public Vector3 RandomPointInsideSphere(float radius)
{
    float u = Random.Range(0f, 1f);
    float v = Random.Range(0f, 1f);
 
    float theta = 2f * Mathf.PI * u;
    float phi   = Mathf.Acos(2f * v - 1f);
    float sqrt  = Mathf.Sqrt(Random.Range(0f, 1f));
    radius *= sqrt;
 
    Vector3 vec;
    vec.x = radius * Mathf.Sin(phi) * Mathf.Cos(theta);
    vec.y = radius * Mathf.Sin(phi) * Mathf.Sin(theta);
    vec.z = radius * Mathf.Cos(phi);
 
    return vec;
}