[LSC] Call for votes: Back Face Culling (BFC) Specification 1.0

[William Howard]

>I think it should be made more clear that renderers can treat models
>as implicitly certified and apply BFC to the parts they reference,
>either directly or via submodels.
>If models contains line type 3 or 4, or references primitives,
>these cannot have BFC applied (unless the model is explicitly certified).

But's that's exactly the problem.  Because a renderer does not know if a
model contains polygons as well as parts it *cannot* just assume that the
file is clippable.  However, as Travis added the bit about parts being
closed objects that can be clipped (culled) provided they are certified
(even if the (sub-)model itself is not certified), everything you have
pointed out is already covered by the spec.

W