Face-normal Rendering

Improved face-normal rendering, by adding two new colors to show invalid normals. These help you detect files that are broken and can only be repaired by recalculating the normals.

• Red normals are NaN or have a zero length, which creates NaNs when normalized.
• Pink normals have an absolute angle between the face and vertex normal above a threshold, such as 85°.

Invalid Normals	Valid Normals