Code:

void PlayState::createPlayer(){   Vector3 size = Vector3::ZERO;// size of the box     Vector3 position = _nodePerson->_getDerivedPosition();  position.y +=2;  Ogre::Quaternion rotation = _nodePerson->_getDerivedOrientation();  // Obtenemos la bounding box de la entidad creada... ------------  AxisAlignedBox boundingB = _sceneMgr->getEntity("BoxPlayer")->getBoundingBox();  size = boundingB.getSize(); // size.y*=2;  size /= 2.0f;   // El tamano en Bullet se indica desde el centro   // after that create the Bullet shape with the calculated size  OgreBulletCollisions::BoxCollisionShape *boxShape = new     OgreBulletCollisions::BoxCollisionShape(size);  // and the Bullet rigid body  _rigidBox = new     OgreBulletDynamics::RigidBody("rigidBox", _world);  _rigidBox->setShape(_nodePerson, boxShape,     0 /* Restitucion */, 0 /* Friccion */,     30 /* Masa */, position /* Posicion inicial */,     rotation /* Orientacion */);  _rigidBox->setLinearVelocity(  _camera->getDerivedDirection().normalisedCopy() * 3.0);   _rigidBox->showDebugShape(true);  _rigidBox->setKinematicObject(true);  // Anadimos los objetos a las deques  _shapes.push_back(boxShape);   _bodies.push_back(_rigidBox);        }

Code:

       _rigidBox->enableActiveState();        _rigidBox->getBulletRigidBody()->setLinearVelocity(btVector3(0,0,1));        _rigidBox->getBulletRigidBody()->activate(true);        _rigidBox->getBulletRigidBody()->translate(btVector3(0,0,10));