Upstream: https://github.com/FGMEMBERS/CRJ-200/tree/393440fa957ea1763dc63c969363a24aa829cf6d
Corresponding editable AC3D and scene XML inputs retained unchanged.
Preparation: neutral surfaces; omit named running gear; triangulate polygons with source winding; crease-based normals; rigid transforms and source XML engine offsets; merge retained surfaces. See scripts/gear3d-body-assets/ac3d.js and the regional-hubs review.
