Bullet Physics Simplest Collision Example

Question

I\'m trying to use Bullet Physics for collision detection only. I don\'t need it to move any objects for me or handle rendering with callbacks. I just want to update object loca

Answer 1

I am writing an IOS app with flighter shooting each other on 3D scene. I use bullet physics for collision detection I set the flighter as kinematic object, my logic move the flighter and then update the btMotionState worldTransform of the kinematic object. I also don't get any collision detections until i change the following two statements (set the masking and group to the same for both player and enemy)

dynamicsWorld->addRigidBody(mPlayerObject,1,1);
dynamicsWorld->addRigidBody(mEnemyObject,1,1);
...
dynamicsWorld->setInternalTickCallback(myTickCallback);

then i can see the

void myTickCallback(btDynamicsWorld *world, btScalar timeStep) {
    int numManifolds = world->getDispatcher()->getNumManifolds();
    printf("numManifolds = %d\n",numManifolds);
}

numManifolds value become 1 when object collides.