Vector3 v = new Vector3(x, y, z) * 2f / gridSize - Vector3.one;
    float x2 = v.x * v.x;
    float y2 = v.y * v.y;
    float z2 = v.z * v.z;
    Vector3 s;
    s.x = v.x * Mathf.Sqrt(1f - y2 / 2f - z2 / 2f + y2 * z2 / 3f);
    s.y = v.y * Mathf.Sqrt(1f - x2 / 2f - z2 / 2f + x2 * z2 / 3f);
    s.z = v.z * Mathf.Sqrt(1f - x2 / 2f - y2 / 2f + x2 * y2 / 3f);
    normals[i] = s;
    vertices[i] = normals[i] * radius;