Real-Time Physics Simulation Forum

Hi~
There is a problem when i detect contacts In XNA
I make a large ConeShape(Much larger than other object) and some transform.
then a small boxShape. i wanna detect contacts between them(Just like collision interface demo)
But when ConeShape completely contains box, moving or rotate the coneShape, sometimes i fail to get any contact points.

Could anyone tell me why? Is there any limitation or it just my logic error?
Thanks in advance

there are no contact points or no collision response at all?

Hi~ yes, i just rotate the big coneShape around vector(x,y,z),then a translation
(a,b,c),then a second translation (a1,b2,c3),
when the cone is small,it can detect contacts.

but when the cone is very large and it completely contains a small box.
Sometimes,then i rotate(cone) a little, it can't detect contacts.
why? is there any limitation in bullet or just my logic error?
Thx!