These constants define any additional data assigned to the vertex.
IG_VECT_VERTDATA_NONE | The vertex does not have any additional data. |
IG_VECT_VERTDATA_BULGE | The outgoing line is bulged. |
IG_VECT_VERTDATA_THICKNESS | The outgoing line has a local thickness. |
IG_VECT_VERTDATA_WEIGHT | The vertex has weight. Used with rational Bi splines. |