static const EdgeNature NO_FEATURE
static const EdgeNature BORDER
static const EdgeNature MATERIAL_BOUNDARY
static const VertexNature S_VERTEX
unsigned short VertexNature
static const EdgeNature EDGE_MARK
unsigned short EdgeNature
static const EdgeNature VALLEY
static const VertexNature VIEW_VERTEX
static const EdgeNature CREASE
static const VertexNature T_VERTEX
static const EdgeNature RIDGE
static const VertexNature NON_T_VERTEX
static const VertexNature CUSP
static const EdgeNature SILHOUETTE
static const EdgeNature SUGGESTIVE_CONTOUR
static const VertexNature POINT