Hello Ivan, Friday, October 4, 2002, 8:10:11 PM, you wrote: IB> Hi slipch, IB> colder its collision detection library http://photoneffect.com/coldet/. People say its very fast. I use it in my game "solar trader" at http://users.volja.net/ibolcina/ , look under "solar trader" It is very interesting. I'll try to use it. -- Best regards, slipch mailto:slipch@gsc-game.kiev.ua