QR Codes and Augmented Reality: Markers, Triggers, and Web AR

1. QR as an AR Trigger

Pointing a phone at a QR code is already a familiar gesture. AR platforms use the same moment to launch an overlay experience: a product in 3D, an instruction video, or a virtual try-on.

2. WebXR and Model-Viewer

For web-based AR, a QR code links to a page with a `` element or a WebXR scene. No app install is needed. The user scans, the browser opens, and the 3D object appears over the camera view.

3. Dedicated App Platforms

Unity (with Vuforia or AR Foundation) and Unreal can use QR codes as image targets. The code is detected, and a 3D scene anchors to it. Suitable for industrial maintenance guides or trade show demos.

4. Design Considerations

* Use level H for AR markers so partial occlusion does not break detection. * Keep surrounding contrast high; complex backgrounds reduce AR tracking stability. * Test in the real lighting environment; dark exhibition halls behave differently from a studio.