Hi,
At the moment we don't support plane recognition.
The tracking plane orientation is used when initializing an Instant Tracker with a predefined plane.
Here are the relevant documentation pages for Unity:
http://www.wikitude.com/external/doc/documentation/latest/unity/instanttrackingnative.html#instant-tracking
http://www.wikitude.com/external/doc/documentation/latest/Reference/Unity%20API/class_wikitude_1_1_instant_tracker.html
Best regards,
Alexandru
jeet rami