Upstream: https://github.com/FGMEMBERS/CRJ700-family/tree/4862db2fe6e4ebab817ccf387c63f847bcf49c5a
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.
