Full Three.js rendering requires one-time npm install. If the dependency is absent, a lightweight built-in preview opens automatically.
LEFT DRAGOrbit cameraRIGHT DRAGPan viewSCROLLZoom between close inspection and orbital overviewW / A / S / DMove in local plane or flyQ / EDescend / ascendSHIFT5× traversal speedFToggle mouse-captured flight modeRReset to orbit overviewLEFT CLICKInspect a mechanical subsystem