diff --git a/Extras/BulletColladaConverter/ColladaConverter.cpp b/Extras/BulletColladaConverter/ColladaConverter.cpp
index c2650dc39..c25d91100 100644
--- a/Extras/BulletColladaConverter/ColladaConverter.cpp
+++ b/Extras/BulletColladaConverter/ColladaConverter.cpp
@@ -3189,6 +3189,35 @@ void ColladaConverter::registerRigidBody(btRigidBody* body, const char* name)
 	
 }
 
+void ColladaConverter::deRegisterRigidBody(btRigidBody* body)
+{
+	btRigidBodyColladaInfo* rbci = findRigidBodyColladaInfo (body);
+
+	if (!rbci)
+		return;
+
+	daeElement::removeFromParent (rbci->m_instanceRigidBody);
+	daeElement::removeFromParent (rbci->m_domRigidBody);
+	daeElement::removeFromParent (rbci->m_node);
+
+	delete rbci;
+	
+	// remove from map
+	int uid = body->getBroadphaseProxy()->getUid();
+	btHashKeyPtr<btRigidBodyColladaInfo*> tmpKey(uid);
+	m_rbUserInfoHashMap.remove (tmpKey);
+}
+
+const char* ColladaConverter::getName (btRigidBody* body)
+{
+	btRigidBodyColladaInfo* rbci = findRigidBodyColladaInfo (body);
+
+	if (!rbci)
+		return NULL;
+
+	return rbci->m_node->getSid();
+}
+
 void ColladaConverter::registerConstraint(btTypedConstraint* constraint, const char* name)
 {
 
@@ -3203,3 +3232,38 @@ void ColladaConverter::registerConstraint(btTypedConstraint* constraint, const c
 	rcci->m_domRigidConstraint->setSid(name);
 	rcci->m_domInstanceRigidConstraint->setConstraint (name);
 }
+
+void ColladaConverter::deRegisterConstraint(btTypedConstraint* constraint)
+{
+	if (constraint->getConstraintType () != D6_CONSTRAINT_TYPE)
+	{
+		return;
+	}
+
+	btRigidConstraintColladaInfo* rcci = findRigidConstraintColladaInfo(constraint);
+
+	if (!rcci)
+	{
+		return;
+	}
+
+	daeElement::removeFromParent (rcci->m_domInstanceRigidConstraint);
+	daeElement::removeFromParent (rcci->m_domRigidConstraint);
+	delete rcci;
+	
+	// remove from map
+	int uid = constraint->getUid();
+	btHashKeyPtr<btRigidConstraintColladaInfo*> tmpKey(uid);
+	m_constraintUserInfoHashMap.remove (tmpKey);
+}
+
+
+const char* ColladaConverter::getName (btTypedConstraint* constraint)
+{
+	btRigidConstraintColladaInfo* rcci = findRigidConstraintColladaInfo (constraint);
+
+	if (!rcci)
+		return NULL;
+
+	return rcci->m_domRigidConstraint->getSid();
+}
\ No newline at end of file
diff --git a/Extras/BulletColladaConverter/ColladaConverter.h b/Extras/BulletColladaConverter/ColladaConverter.h
index 43bbdbea4..9f4a1cdeb 100644
--- a/Extras/BulletColladaConverter/ColladaConverter.h
+++ b/Extras/BulletColladaConverter/ColladaConverter.h
@@ -99,7 +99,6 @@ protected:
 	btHashMap<btHashKeyPtr<btRigidBodyColladaInfo*>,btRigidBodyColladaInfo*>	m_rbUserInfoHashMap;
 	btHashMap<btHashKeyPtr<btRigidConstraintColladaInfo*>,btRigidConstraintColladaInfo*> m_constraintUserInfoHashMap;
 	
-	
 	class DAE* m_collada;
 	class domCOLLADA* m_dom;
 	char* m_filename;
@@ -191,10 +190,11 @@ public:
 	
 	void registerRigidBody(btRigidBody* body, const char* name);
 	void deRegisterRigidBody(btRigidBody* body);
+	const char* getName (btRigidBody* body);
 
 	void registerConstraint(btTypedConstraint* constraint, const char* name);
 	void deRegisterConstraint(btTypedConstraint* constraint);
-
+	const char* getName (btTypedConstraint* constraint);
 
 	///those virtuals are called by load and save.
 	virtual btTypedConstraint*			createUniversalD6Constraint(