A surface v1 can write: a rendered TIN with vertices and at least one
VISIBLE face. A surface whose every face is an authored <F i="true"> draws
nothing, so it is refused by name like any other non-rendered surface rather
than vanishing from an otherwise successful export.
A surface v1 can write: a rendered TIN with vertices and at least one VISIBLE face. A surface whose every face is an authored
<F i="true">draws nothing, so it is refused by name like any other non-rendered surface rather than vanishing from an otherwise successful export.