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Game object size and real world object size

Hi All,

I am new to using Vuforia as I search through any AR plugin to use in Unity3D.

I have successfully created a target in TMS, downloaded it and tested it with my marker and everything seems working fine, except I have below questions that would like help to solve.

1. My app needs quite precise sizing; as I am trying to recreate furnitures (chairs, tables) in the game world using the AR marker. I have searched and read a few post, they seem to recommend that, the object to be generated by the marker should be smaller or within the marker size; but we all know... if I am to put a real table on top of the marker, I can't really find a marker that big can I? How can I achieve this, or this is a dead-end?

2. I am using a 5-starred marker, black and white, high contrast and yet when the game object created on top of it, its shaking, sometimes quite violently. Why is it? I tried the sample project (the kettle one) and they settle down so quietly. Could any suggest how to solve this?

Many thanks in advance!