C#/XNA BulletX: Why there is no Contact point sometimes?

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ocean2oo6
Posts: 18
Joined: Thu Nov 15, 2007 2:01 pm
Location: Sichuan province, China
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C#/XNA BulletX: Why there is no Contact point sometimes?

Post by ocean2oo6 »

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 :)
topcomer
Posts: 32
Joined: Thu Sep 21, 2006 1:53 pm
Location: sweden but italian

Re: Why there is no Contact point sometimes?

Post by topcomer »

there are no contact points or no collision response at all?
ocean2oo6
Posts: 18
Joined: Thu Nov 15, 2007 2:01 pm
Location: Sichuan province, China
Contact:

Re: C#/XNA BulletX: Why there is no Contact point sometimes?

Post by ocean2oo6 »

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!
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