why ? OrthographicLens not add coordinateSystem?

You might need to expand on that…

Understand that there is no perspective on this lens type. Things viewed head on appear 2 dimensional. I have been making use of this recently for 2D interfaces, rather than mixing in the Starling framework.

It can be hard to get your head around at first.

Cheers!

Mighty hes talking about Right/LeftHanded coord system.
It was added to the Perspective lens in dev and Master branches recently
Just been talking to Rob and it needs sorting out. As primitives are inverted + other issues.

So to answer. It will be added eventually

yes , thank to JohnBrookes