Hi all！
I want to learn more physics in the sample file "earthball.c" ,but when i change the level_load("small.hmp") to level_load("small.wmb") ,it does not work! (i have converted the small.hmp file to small.mdl,and in WED add small.mdl produce small.wmb),the ball just stick there,
why

Earthball collide with bbox of "small.mdl", set flag POLYGON to model to fix this.

thanks ,but it does not work , i put the small.hmp in wed and set small.hmp PLOYGON,then build small.wmb ,and it does not work too ! why ?