i can keep the virtual button instance after losing image target.. so here how can i access the button's onkeypress event after losing image target...
Do you mean OnButtonPressed? - if so, you can't, the target needs to be detected for Virtual Buttons to function.
For other types of key press and input events see - http://docs.unity3d.com/Documentation/Manual/Input.html
That application is using motion capture to track hand and arm motion. With Vuforia, the buttons need to be on the target. They use occlusion detection, not motion capture. But Qualcomm does offer a computer vision SDK that can be employed to track gestures in the way that the Zugara app is - https://developer.qualcomm.com/mobile-development/mobile-technologies/computer-vision-fastcv
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