Google Scene Viewer has to work across network conditions and devices, not just on a fast desktop. For interaction map, test the first useful frame, interaction readiness, and fallback behavior separately.
For Google Scene Viewer, test slow loading, unavailable 3D support, keyboard or assistive input, and disabled analytics. The fallback should still communicate the product or scene clearly.
List every hotspot, state change, input method, focus order, and mobile gesture before authoring annotations. Apply this interaction map guidance to the actual Google Scene Viewer delivery path.