Face mode bit flags

BILLBOARD

always orient after camera

DYNAMIC

respond to collisions

INVISIBLE

invisible face

HALO

halo face, always point to camera

LIGHT

dynamic lighting

OBCOL

use object colour instead of vertex colours

SHADOW

shadow type

SHAREDCOL

shared vertex colors (per vertex)

TEX

has texture image

TILES

uses tiled image

TWOSIDE

twosided face