The DSi cannot do true AR. It lacks the hardware trinity: Camera (rear), Depth Sensor, Compute.
| Technique | How | Example |
|---|---|---|
| Pre-rendered Background + Overlay | Photo taken on PC → Load as BG → Draw 3D on top | Virtual pet "on your desk" (static image) |
| Marker Detection (QR/ARTag) | Front camera reads printed marker → Transforms 3D model | Homebrew: ARds (2010), DSiAR. 2-3 fps, jittery. |
| Face Tracking (Hinge Cam) | Detect eyes/mouth → Map to 2D sprite | Face Training (Nintendo), WarioWare: Snapped! (DSiWare) |
| Gyro/Accel (Not in DSi) | — | 3DS has it. DSi: No. |
DSi = Camera toy, not AR platform. For AR: 3DS or Switch.