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Turn taps into 3D intent. Raycast to pick the character or the ground, move with click-to-move, face the travel direction, and wire a tiny state machine that drives Idle ⇄ Walk ⇄ Run cross-fades — coexisting with OrbitControls. Live demo.
The grand finale: drive the viewBox with the mouse to build pan and zoom-toward-cursor navigation — the engine behind every web map. Drag-to-pan math, the zoom-to-point formula, non-scaling strokes, and choropleth regions. With a live map.
Turn a scene into a UI: how a Raycaster picks objects under the cursor, normalized device coordinates, hover and click handling, performance tips for picking, and dragging objects — with a live hover-and-select demo.