f557222a7b
Triangles and quads don't check for degenerate faces (where the normal might be zero), while ngons already set the Z component to 1 for that, which is also what we do for vertex normals. Also reorder the face size checks to put quads and triangles before N-gons, since they are typically more common on high-poly meshes. And change the check for 2 sided faces into an assert.
Blender
Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing.
Project Pages
Development
License
Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license.
See blender.org/about/license for details.