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Merge pull request #9845 from AndrewMeadows/fix-rare-physics-crash

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fix rare physics crash
This commit is contained in:
Seth Alves 2017-03-15 09:30:29 -08:00 committed by GitHub
commit 94e2cd6e68
1 changed files with 25 additions and 2 deletions
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27
libraries/physics/src/PhysicsEngine.cpp
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@ -143,12 +143,35 @@ void PhysicsEngine::addObjectToDynamicsWorld(ObjectMotionState* motionState) {
}
void PhysicsEngine::removeObjects(const VectorOfMotionStates& objects) {
// first bump and prune contacts for all objects in the list
// bump and prune contacts for all objects in the list
for (auto object : objects) {
bumpAndPruneContacts(object);
}
// then remove them
if (_activeStaticBodies.size() > 0) {
// _activeStaticBodies was not cleared last frame.
// The only way to get here is if a static object were moved but we did not actually step the simulation last
// frame (because the framerate is faster than our physics simulation rate). When this happens we must scan
// _activeStaticBodies for objects that were recently deleted so we don't try to access a dangling pointer.
for (auto object : objects) {
btRigidBody* body = object->getRigidBody();
std::vector<btRigidBody*>::reverse_iterator itr = _activeStaticBodies.rbegin();
while (itr != _activeStaticBodies.rend()) {
if (body == *itr) {
if (*itr != *(_activeStaticBodies.rbegin())) {
// swap with rbegin
*itr = *(_activeStaticBodies.rbegin());
}
_activeStaticBodies.pop_back();
break;
}
++itr;
}
}
}
// remove bodies
for (auto object : objects) {
btRigidBody* body = object->getRigidBody();
if (body) {