One named coordinate-system basis the user can pick from the
Import dialog's Basis dropdown. Each entry pairs a label
(which calls out the authoring apps that emit this basis) with
the column-major 3×3 rotation that maps local axes to world.
The special "auto" entry has basis: null — that means the
dialog passes no override and the loader (or coord-sys sidecar
file) decides.
One named coordinate-system basis the user can pick from the Import dialog's Basis dropdown. Each entry pairs a label (which calls out the authoring apps that emit this basis) with the column-major 3×3 rotation that maps local axes to world.
The special "auto" entry has
basis: null— that means the dialog passes no override and the loader (or coord-sys sidecar file) decides.