- Ifc: fix normalization of base mesh normal for opening generation.
- Ifc: no need to generate contour skiplist twice.
- Ifc: clean up temporary wall points when switching from horizontal to vertical openings.
- Ifc: [openings] don't accidentally mirror stuff when projecting onto 2D planes.
- Ifc: more opening tweaks.
- Ifc: [openings] more fine-tuning and some debugging aid.
- Ifc: more opening tweaks, half a step back again.
Merge branch 'master' of github.com:assimp/assimp