幽灵物体 - 子弹物理学

Question

我正在尝试在bulletphysicals中实现一个简单的幽灵对象，这就是我创建幽灵对象的方式：

btGhostPairCallback* ghostCall = new btGhostPairCallback();
world->getBroadphase()->getOverlappingPairCache()->setInternalGhostPairCallback(ghostCall);

btGhostObject* ghostObj = new btGhostObject();
btCollisionShape* shape = new btBoxShape(btVector3(ofGetWidth()+1000, ofGetHeight()+1000, 50));
ghostObj->setCollisionShape(shape);
btTransform trans;
trans.setIdentity();
trans.setOrigin(btVector3(0,0,-500));
ghostObj->setWorldTransform(trans);
ghostObj->setCollisionFlags( btCollisionObject::CF_NO_CONTACT_RESPONSE);
world->addCollisionObject(ghostObj,btBroadphaseProxy::SensorTrigger,btBroadphaseProxy::AllFilter & ~btBroadphaseProxy::SensorTrigger);

这是尝试找到碰撞的方法：

btCollisionObject* obj = world->getCollisionObjectArray()[j];
btRigidBody* body = btRigidBody::upcast(obj);

    btAlignedObjectArray < btCollisionObject* > objsInsidePairCachingGhostObject;
    btAlignedObjectArray < btCollisionObject* >* pObjsInsideGhostObject = NULL;
    btGhostObject* ghost = btGhostObject::upcast(obj);

    if(ghost){
        objsInsidePairCachingGhostObject.resize(0);
        pObjsInsideGhostObject = &ghost->getOverlappingPairs();
        cout << ghost->getNumOverlappingObjects() << endl;

但我总是得到这样的回应：我的所有世界对象都与幽灵对象发生碰撞。

任何人都可以帮助我获得一个功能简单的幽灵对象吗？

谢谢

Answer 1

据我对 GhostObject 的了解，您正在覆盖它的默认碰撞标志。尝试改变这一行

ghostObj->setCollisionFlags( btCollisionObject::CF_NO_CONTACT_RESPONSE);

到：

ghostObj->setCollisionFlags( ghostObj->getCollisionFlags() | btCollisionObject::CF_NO_CONTACT_RESPONSE);

华泰