mpdeveloper_B
Thanks for your code, but the code does not work well with my movement code, as I am using down force in relative movement as well. But that insprire me some idea to use later. I also found c_move also return bounce vector, maybe I will base on your code to make my own bounce effect.

Tobias
Yeah after set the POLYGON flag the collision behaves like map entity now, thanks for the hint.

Thank you all