Added warning for creating any of the physics components into the root scene node, as that is unsupported and may not eg. reload properly.

Engine/Physics/CollisionShape.cpp

@@ -630,6 +630,9 @@ void CollisionShape::OnNodeSet(Node* node)
         Scene* scene = GetScene();
         if (scene)
         {
+            if (scene == node)
+                LOGWARNING(GetTypeName() + " should not be created to the root scene node");
+            
             physicsWorld_ = scene->GetComponent<PhysicsWorld>();
             if (physicsWorld_)
                 physicsWorld_->AddCollisionShape(this);

Engine/Physics/Constraint.cpp

@@ -358,6 +358,9 @@ void Constraint::OnNodeSet(Node* node)
         Scene* scene = GetScene();
         if (scene)
         {
+            if (scene == node)
+                LOGWARNING(GetTypeName() + " should not be created to the root scene node");
+            
             physicsWorld_ = scene->GetComponent<PhysicsWorld>();
             if (physicsWorld_)
                 physicsWorld_->AddConstraint(this);

Engine/Physics/RigidBody.cpp

@@ -775,6 +775,9 @@ void RigidBody::OnNodeSet(Node* node)
         Scene* scene = GetScene();
         if (scene)
         {
+            if (scene == node)
+                LOGWARNING(GetTypeName() + " should not be created to the root scene node");
+            
             physicsWorld_ = scene->GetComponent<PhysicsWorld>();
             if (physicsWorld_)
                 physicsWorld_->AddRigidBody(this);