yeah it's done

public void GenerateStar(Sprite3d star, double startTime, float width, float rotate, float randX, float randY, Boolean rgb = true)
        {
            double beat = Beatmap.GetTimingPointAt((int)startTime).BeatDuration;
            if (!rgb)
            {
                star.PositionX.Add(startTime, randX);
                star.PositionY.Add(startTime, randY);
                star.PositionZ.Add(startTime, (float)-width);
                star.ScaleX.Add(startTime, 20f).Add(startTime + beat * 11.5, 20f).Add(startTime + beat * 14, 500f, EasingFunctions.ToEasingFunction(OsbEasing.InCirc));
                star.ScaleY.Add(startTime, 20f).Add(startTime + beat * 11.5, 20f).Add(startTime + beat * 14, 500f, EasingFunctions.ToEasingFunction(OsbEasing.InCirc));
                star.ScaleZ.Add(startTime, 20f).Add(startTime + beat * 11.5, 20f).Add(startTime + beat * 14, 500f, EasingFunctions.ToEasingFunction(OsbEasing.InCirc));
            }
            else
            {
                star.PositionX.Add(startTime, randX).Add(startTime + beat * 8, randX).Add(startTime + beat * 8 + 1, randX + Random(-10, 10), EasingFunctions.ToEasingFunction(OsbEasing.InCirc)).Add(startTime + beat * 10, randX).Add(startTime + beat * 11.5, randX);
                star.PositionY.Add(startTime, randY).Add(startTime + beat * 8, randY).Add(startTime + beat * 8 + 1, randY + Random(-10, 10), EasingFunctions.ToEasingFunction(OsbEasing.InCirc)).Add(startTime + beat * 10, randY).Add(startTime + beat * 11.5, randY);
                star.PositionZ.Add(startTime, (float)-width);
                star.ScaleX.Add(startTime, 20f).Add(startTime + beat * 11.5, 20f).Add(startTime + beat * 14, 500f, EasingFunctions.ToEasingFunction(OsbEasing.InCirc));
                star.ScaleY.Add(startTime, 20f).Add(startTime + beat * 11.5, 20f).Add(startTime + beat * 14, 500f, EasingFunctions.ToEasingFunction(OsbEasing.InCirc));
                star.ScaleZ.Add(startTime, 20f).Add(startTime + beat * 11.5, 20f).Add(startTime + beat * 14, 500f, EasingFunctions.ToEasingFunction(OsbEasing.InCirc));

                for (double e = startTime + beat * 11.5; e < startTime + beat * 14; e += 50)
                {
                    star.PositionX.Add(e, randX + Random(-50, 50));
                    star.PositionY.Add(e, randY + Random(-50, 50));
                }
            }
        }