Selects all faces whose vertices are arranged in such a way that their total area is zero, or very close to it, making the face invisible during rendering. This is a type of degenerate geometry that can occur when accidentally forming faces from vertices in a linear arrangement, scaling down to zero on an axis that has faces spanning it, or other situations.

Due to numerical imprecision, there is some potential for false positives in this opertation when used on extremely small geometry. At typical sizes, only actual zero-area faces should be selected.