Real-Time Physics Simulation Forum

There are 2 standard callbacks defined in btCollisionWorld : btCollisionWorld::ClosestRayResultCallback btCollisionWorld::AllHitsRayResultCallback I'm not sure which callback method you're referring to with the btScalar return as the standard ray test has a void return type. You can check the callba...

I think the viewing things you're talking about are just the demo applications? you don't need to use any of that to use bullet in your own system, so don't have any rendering overhead and the like. Main objects you need are : CollisionWorld ConstraintSolver Dispatcher BroadPhase In terms of stoppin...

Maybe I've mis-understood but what sort of raycast were you looking to do? btCollisionWorld has a rayTest method and standard callbacks for closest point and all points .

There's no way to directly do this, but it's easy enough to do. You just need to do the counting in your main update loop, once you've reached your target time or frame just stop further calls to stepSimulation. You can then get the list of rigidBodies from the collisionWorld and just go through the...

This may be some use :

http://www.ntu.edu.sg/home/ehchua/progr ... ullet.html

not sure why you're trying to build JStackAlloc itself, but it is a little messy trying to test things in eclipse.

Which JStackAlloc are you using? the standar JBullet library seems to come with an existing JStackAlloc jar?

do you have any more info on the output/error ?

You can look at BasicDemo.cpp for this (relevant code below) //We can also use DemoApplication::localCreateRigidBody, but for clarity it is provided here: { btScalar mass(0.); //rigidbody is dynamic if and only if mass is non zero, otherwise static bool isDynamic = (mass != 0.f); btVector3 localIner...

localCreateRigidBody is just a shortcut method in the demo classes for creating and adding a rigid body to the world.

it sounds like what you're actually looking for is a CompoundCollisionShape?

I couldn't see anything obviously wrong in any of your setup code. What happens if you change your step value? does the speed change?, are the values going into the stepSimulation call in DiscreteDynamicsWorld what you'd expect? the default simulation frequency (fixedTimeStep) is 60Hz , again is thi...

Not sure how complex your terrain is, but the HeightFieldTerrainShape should work quite well, as should your btBvhTriangleMeshShape , if you have a look at the demos you should see some examples of 'dynamic' terrain.

That function is just converting a 2d grid look up into a 1d one.

I don't think that it stores the transformed version of the meshes so you'd need to transform the data in the meshInterface by the worldTranform of the shape (and the rigidbody) to get the final positions in worldspace..

If it's got a striding mesh interface you can use :

getLockedVertexIndexBase

Speaking of a managed version of Bullet I've finally got round to putting the one I'd been tinkering with up on google code : http://code.google.com/p/bullet-xna/ It's based on 2.76 with a few fixes from 2.77. It's missing Softbody and Serialisation support at the moment. It does work on the pc and ...

Don't think it is, I've submitted a few patches to it but never seen any updates for ages apart from a comment about them working on a new project.