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Placing object on the floor

I want to know how people placing 3d object on the detected floor.. and the user can drag the object to move the object but the object has perspective ( I mean when we move the object, it's still on the floor...)

here's an example video :

http://www.youtube.com/watch?v=8Szy4UU5dMg

Thats done using the SLAM feature in Metaio. Unfortunately Metaio is not available anymore as it has been acquired by Apple. Vuforia seems to have no plan for such a feature.