Augmented Reality: virtual world not overlapping real world correctly

[Vaquero]

One more question: For the optical heading, must the markers be in line with the center line left and right of the IC4? Because that's not possible with the way the IC4 is mounted on the device. It's ontop the back where the surface is curved, so I would only be able to place markers left and right besides the front of the inertia cube.