[Unity3D + Vuforia] Does anyone know how to merge the 3D object at runtime? (Android)

Hello everyone,

Firstly, i have to apology that if i have post the thread in a wrong area.

My final year project needs to make a android application for Augmented Reality(AR) 3D model creation,similar as http://www.youtube.com/watch?v=xqB--gfwaak&feature=youtu.be

I have create some 3D model like cube,cuboid etc on the AR marker and run it successfully in my android device,but i have no idea that how to make the models megre together at runtime. For example, 4 cylinder and 1 board become a chair.

Dose anyone can give me some hints or some reference or tutorial about the merging?

Thank you

Check out the Mesh.CombineMeshes method Unity - Scripting API: Mesh.CombineMeshes

Thank you,

I have take a look of the Mesh.CombineMeshes method, I know that it can group two or more models become a single model,even the model is not connected, but im not sure that how two model is connected in runtime