The tracking error is relevant to the distance between marker and divice.

[Bornblack]

I have done the HoloLensCamCalib for better alignment . But actually the alignment error is not stationary , as the error gets bigger when I put marker away from the divice . Is there a optimal working distance for HoloLensARToolkit ？ Or Do I miss somthing else？

[qian256]

Which device are you using, HL1 or HL2? Did you print the marker to be exact size as specified in the scene?

[Bornblack]

Thanks for your reply ! My device is HL 2, and I try the HL2ARToolKitSingle sample , the size of the marker I print is 4cm (a 4x4 cm marker in A4 paper) . I guess the problem is not the size of the marker. In your code,
The position of the virtual object = TransMatrix X LocatableCameraToWorld X CalibrationMatirx
I think it is the inaccuracy camera parameters I calibrate cause this magnifying error , as the error gets larger when the distance is increasing between HL2 and marker . Maybe I need to calibrate my HL2 again for accuracy camera parameters.
By the way , I am a little confused about the Boader Size . As for the cube sample , the size of the cube I make is 6 cm , same as the virtual cube . And the size of the marker at the center of each face is 4 cm , so I have to change the Border Size parameter to 2/6 , right ?