AcGiVisualStyleProperties::FaceModifiers Enumeration

enum FaceModifiers {
  kNoFaceModifiers = 0,
  kFaceOpacityFlag = 1,
  kSpecularFlag = 2
};

acgivisualstyle.h

Members	Description
kNoFaceModifiers	Apply no face modifiers to the faces.
kFaceOpacityFlag	Apply an opacity value to the faces. If unset, faces are displayed with full opacity. If set, faces are displayed with a specified degree of opacity from completely opaque to completely transparent.
kSpecularFlag	Apply a specular highlight (indicating reflection and shininess values) to a material that is applied to the faces.

Bitfield that describes modifications to faces made before any lighting and shading calculations have been performed.