Drops the cylinder+box airplane built last commit in favor of a CC-BY
3D commercial airliner from Poly by Google (188 KB GLB, 11.3k tris,
hosted in assets/airplane.glb). Loaded at runtime via three/addons
GLTFLoader; importmap extended to expose the addons subpath.
Bug worth noting: a naive setFromObject + position.sub(center) +
scale.setScalar pipeline leaves the model offset by -center after
scaling because position is in pre-scale units. Fix is to wrap the
model in a Group, apply the centering offset to the inner model,
then scale the outer Group — the whole transform stays consistent.
Attribution added in two places per CC-BY 3.0:
- HTML header comment with creator + source URL + license link
- JS file header in intro-scene.js
Tone-mapping bumped to ACES filmic for a slightly nicer render.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
