Marker Size parameters

[AlgoSurg]

Is there any way I can assign marker size. Currently, a cube of 1mm length is fitting to the marker, so the marker size is considered as 1 unit. Can I change it to 0.1 units? So that the entire scene will be relatively smaller w.r.t. the marker in the AR scene. There was a parameter named 'size' in ThreeARtoolkit but I could not figure that out in this library.

Also, how to transform the origin where the camera is pointing at... currently its the origin (0,0,0) which is placed on to the marker. I sthere any way I can make another (x,y,z) point on top of the marker? I am using 'cameraTransformMatrix' as changeMatrixMode.