OculusRoomTiny(DX11) - how to combine quaternions when observor can look up/down ?

Hey all,

So, I've refactored OculusRoomTiny(DX11)  to make it a little more useful.

The code is here - same license as oculus code - use it if you want for anything.

http://pastebin.com/jLA06b5m

That replaces main.cpp in the oculus OculusRoomTiny(DX11) sample project.

Controls are the same as the original, except cursor up/down now looks up down.

That's the reason for posting - looking up/down introduces a problem. As you can see, when combining the eye & observor orientations transforms now generates incorrect results.

As this is a common use scenario, I'm surprised the sample code doesn't demonstrate this.

Likely a simple quaternion math issue, but as I'm sure others have encountered and solved this, I figured I'd post the refactored code and ask for help before diving deeper.

Refactored code all yours if it's helpful.

Thanks in advance.

Best regards,
Steve.