RE: Spatial Anchors - Position of markers
Thanks for your feedback and interest in Guides. To give you a bit of context, here is how Guides anchoring works.
As soon as you scan a QR code, Guides creates a reference anchor at the QR code location. All the holograms of your guides are saved in space relative to that reference anchor. Every time the QR code is scanned, the reference anchor is repositioned to match the QR code as much as it can. To ensure your alignment with the QR code is still good, you can check the green outline that appears over it, which should be aligned with the edges of the QR code.
During scanning, a small amount of angular error, usually not visible to the naked eye, might be introduced due to various factors. The angular error will be more noticeable the farther way the hologram is from the reference anchor. The position of holograms that are far away from the anchor might change after every scan.
To overcome this issue and minimize the potential position error, we advise users to print QR codes at a minimum size of 10.1 cm and to keep the content of their guide within 5m of the reference anchor. If the procedure you are building requires users to walk long distances like mentioned, we would advise to split the steps into different guides.
We continually invest in anchoring accuracy and will publish new documentation online to clarify these points very soon.
