what is a "degenerative face" ?

Eternal

L69: Deviant Member
Jul 8, 2009
69
10
It doesn't seem to do anything bad but when I read through my current compile logs I noticed it listed my map as having 1 degenerative face. Typically having something degenerate would be a bad thing so I just want to make sure so if it IS a problem I can nip it in the bud earlier rather than later.
 

YM

LVL100 YM
aa
Dec 5, 2007
7,135
6,056
its a face with 0 area.

Or its a face with a texture applied perpendicular to its face.. probably the first.