Hi all Did ODE use the contact caching strategy and warm starting the PGS LCP solver to make object stack more stable? if yes,then where the code? If no,why ODE do not use this strtegy? ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡jiang628 at hotmail.com ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2006-05-29