UnityEngine.Geometry.GetFibonacciSphereVertices C# (CSharp) Method

        public static List<Vector3> GetFibonacciSphereVertices(int vertexCount = 1, bool randomize = true)
        {
            List<Vector3> vertices = new List<Vector3>();
            vertices.Capacity = vertexCount;

            float random = 1f;

            if (randomize)
                random = Random.Range(0f, 1f) * vertexCount;

            float offset = 2f / vertexCount;
            float increment = Mathf.PI * (3f - Mathf.Sqrt(5)); // what is 3 and 5?

            float x, y, z, r, phi;
            for (int i = 0; i < vertexCount; i++)
            {
                y = ((i * offset) - 1) + (offset / 2f);
                r = Mathf.Sqrt(1f - Mathf.Pow(y, 2));

                phi = ((i + random) % vertexCount) * increment;

                x = Mathf.Cos(phi) * r;
                z = Mathf.Sin(phi) * r;

                vertices.Add(new Vector3(x, y, z));
            }

            return vertices;
        }