useBVHModel,check model from stp file, why collide function always return true?

[huiyue]

I use BVHModel create two geometry, and use addsubmodel to load stp file data. Then,use this two geometry to create CollisionObject.
but when I change the obj's translation, collide(...) function always have the same result with result.is_Collision() is true.
by the way , use distance(...) function can get various min_dintance when it bigger than zero.

[myagen]

please use OBBRSS