GameObject to be available on screen all the time like GUI Texture ?

Am using Vuforia to create AR kind of games. I need to drag and drop an image in a cube(kind of depositor), but i want the depositor(cube) to be appear all time on the screen.

I can’t use GUITexture as i need to use collider to detect the collision.

how to achieve this ?

Thanks.

one simple solution is make the cube child of the camera , so when the camera moves it will move along. Make sure that cube is in camera view when you parent it.

or you can also change the transform of the cube every frame depending on the forward direction of camera such a way that it always stays at certain distance from camera.

I guess the first method will be simple in this case.