Real-Time Physics Simulation Forum

do a search for contacts callback on the forum
this has been answered many times before

I do this kind of things a lot because of the meshes we get from maya are basically never centered around their pivot. Instead of adding a transform I transform the vertices of the shape so that the vertices are centered around the pivot, and no need for a top transform, once that is done I apply an...

the usual patch process is creating an issue on the google code and attach the
svn patch to it so that erwin can review / publish into the main trunk

F

no pointer to the world in btCollisionObject is meant
to avoid circular dependencies , so don't think this
will make it ...

Check this thread :

http://bulletphysics.org/Bullet/phpBB3/ ... f=9&t=7263

Check the contact added callback in here :

http://bulletphysics.com/Bullet/BulletF ... ource.html

gives you the pointers to the collisionObjects colliding, good way to find out
what's colliding with what

CF_CUSTOM_MATERIAL_CALLBACK is designed so that you can change the collision response per face on an object. you will get a callback from bullet when a contact happens with this object. You can also use the contact information to derive other stuff, like glue/facturing/particle emission etc Check th...

Although this should work, bullet still needs faster code
to remove a lot of objects without removing them all....

I haven't spent too much time timing this in bullet, but I suspect very much that the removeOverlappingPairsContainingProxy call in the destroyProxy function will take a lot of time when destroying a lot of objects... we have scene with 300,000+ objects and it's pretty long. Will try and come up wit...

We do have the same kind of issues with very slow reset/cleanup. I can think of a big sim (~300,000 objects i believe) and it is taking a few minutes to actually reset the simulation. I did quite a lot of profiling to see where the time was gone and it's actually the removeRigidBody that is taking 9...

there's no such thing for soft bodies...
in our implementation you can apply velocities by calculating
the proper velocity for each node in the soft body.
it's not a one line thing but still pretty easy/fast to implement

Francois

the generic6Dof constraint is limited to -180 180 on the y axis
as far as i can remember, if you want rotation only on the y axis
you can either rotate the constraint or use a hinge constraint.

F

just out of curiosity, what was the problem / solution ?

Not related to the original post but, is there any place in bullet where even when compiled for doubles bullet uses float numbers ? I haven't had much time to look deeper into it but recently figured out that compiling as double was giving me non-deterministic solves in some situations and it was de...

it's actually a very simple scene , which was quite surprising when I saw that it was not deterministic (see attached image) a sphere or radius 1, mass 100 at (0,15,0) 4 cubes 1 unit , mass 1, wide slightly penetrating 1 ground cube 20x5x20 (passive) this will lead to very different results everytim...