Table 2. Requirements and troubleshooting for developers and users.

Developers

Software and hardware requirements

* Ensure using https URLs; otherwise webcams will not activate. * Free web hosting services work, as web pages only need to be hosted but run in the client. * Given the regular updates in w3c standards, APIs and libraries, routine tests are recommended to ensure normal functioning. * Examples from this paper were verified to work “out of the box” on Safari in multiple MacOS 10.x versions and on multiple Chrome and Firefox versions in Windows 8, Windows 10, Linux RedHat Enterprise Edition, Ubuntu and ArchLinux. * Currently limited and heterogeneous support in tablets and smartphones, these devices are not recommended.

Users

Software and hardware requirements

* Need a webcam- and internet-enabled computer (desktop or laptop). * Enable webcam when prompted. * JavaScript and WebGL must be enabled in the browser (that is a default setting). * Check that ad blockers and firewalls do not block the webcam and other content. * Pages containing large Wavefront files may take time to load (half to a few minutes).

Augmented reality markers

* Print on regular printer; try different sizes for different applications. * When using Hiro and Kanji markers ensure they are printed at the same size. * Ensure that makers have a white frame around the black drawing, at least 10% of size. * To improve marker recognition, avoid glossy papers. Opaque paper is best. * Lighting may also affect the quality of the AR experience. * Markers are easier to handle if glued on solid surfaces (but avoid wrinkles). * Cubic marker can be glued on solid rubber cube cut to appropriate size.