Code:

// create a simple tree like object{btCompoundShape *comp = new btCompoundShape;btBoxShape *box = new btBoxShape(btVector3(2,2,2));btSphereShape *sphere = new btSphereShape(2);btTransform tbox, tsphere;tbox.setIdentity();tsphere.setIdentity();tbox.setOrigin(btVector3(-2,0,0));tsphere.setOrigin(btVector3(2,0,0));comp->addChildShape(tbox, box);comp->addChildShape(tsphere, sphere);btTransform tbody;tbody.setIdentity();tbody.setOrigin(btVector3(0,10,-10));btScalar mass(1);bool isDynamic = (mass != 0.f);btVector3 localInertia(0,0,0);if (isDynamic)groundShape->calculateLocalInertia(mass,localInertia);btRigidBody *body = new btRigidBody(mass,new btDefaultMotionState(tbody),comp,localInertia);m_dynamicsWorld->addRigidBody(body);}// count the number of collision shapes actually in useint count = 0;btHashMap<btHashPtr, btCollisionShape*> shapes;for (int i=0; i<m_dynamicsWorld->getNumCollisionObjects(); i++) {btCollisionShape *shape = m_dynamicsWorld->getCollisionObjectArray()[i]->getCollisionShape();if (!shapes.find(shape)) {count++;shapes.insert(shape, shape);}if (shape->isCompound()) {btCompoundShape *comp = (btCompoundShape*) shape;for (int j=0; j<comp->getNumChildShapes(); j++) {btCollisionShape *child = comp->getChildShape(j);if (!shapes.find(child)) {count++;shapes.insert(child, child);}}}}// logging information: print the the number of objects that should be serialised printf("serialization\n");printf("# constraints: %d\n", m_dynamicsWorld->getNumConstraints());printf("# collision objects: %d\n", m_dynamicsWorld->getNumCollisionObjects());printf("# collision shapes: %d\n", count);

Code:

if (!m_fileLoader->loadFile("testFile.bullet")){//....}else{// count the collision shapes that are actually in use int count = 0;btHashMap<btHashPtr, btCollisionShape*> shapes;for (int i=0; i<m_fileLoader->getNumRigidBodies(); i++) {btCollisionShape *shape = m_fileLoader->getRigidBodyByIndex(i)->getCollisionShape();if (!shapes.find(shape)) {count++;shapes.insert(shape, shape);}if (shape->isCompound()) {btCompoundShape *comp = (btCompoundShape*) shape;for (int j=0; j<comp->getNumChildShapes(); j++) {btCollisionShape *child = comp->getChildShape(j);if (!shapes.find(child)) {count++;shapes.insert(child, child);}}}}// logging information: print the the number of objects that where deserialised printf("deserialization\n");printf("# constraints: %d\n", m_fileLoader->getNumConstraints());printf("# collision objects: %d\n", m_fileLoader->getNumRigidBodies());printf("# collision shapes: %d actually in use, %d loaded\n", count, m_fileLoader->getNumCollisionShapes()); //<------discrepancy here!!!!!!}