Markerless AR lib for iPhone

I'm searching a functional AR Markerless library for the iPhone (from 3GS and supporting iOS 4.3 at least).

I've already tested a large amount of SDKs including Qualcomm AR, Layar, ARToolkit, but none of them was satisfying my needs.

To be more precise, I need neither a localization-based AR technology (Layar), nor a marker technolo开发者_如何学JAVAgy (ARToolkit). If possible, the library has to be free, as I don't have much financial resources.

Qualcomm ( QCAR ) has recently released an iOS version into beta. So if that's why it didn't meet your needs, it may now.

Also Junaio's Glue provides a simple 'markerless' solution - http://www.junaio.com/publisher/junaioglue

There are also free, and inexpensive, licenses for String - http://www.poweredbystring.com/ but String targets need to have a high contrast rectangular border.

Other SDKs by Total Immersion and Metaio are rather expensive - or they were the last time I'd checked.

If QCAR for iOS will work, that may be your best bet.