Mesh Faces

.showAB show a line from A to B in wireframe mode (also .showBA)

.showAC show a line from A to C (same as .showCA)

.showBC show a line from B to C (same as .showCB)

.vA index to vertex A of the face (starts at 1, same as vertex list)

.vB index to vertex B of the face

.vC index to vertex C of the face