i messed around the code to come up with this easy to understand codes<br /><br />[color=blue]if (y<-0.5) return y; // change the value to check where to rebounce example y<1.0<br /> else<br />return 1;[/color]<br /><br />[s]i finally understand my own codes[/s] <br /><br />no worries! the original codes [s]was confusing/misleading i think [/s] deeper meaning than i thought