Structure UF_VIEW_edge_display_options_t specifies options that
control the display of hidden edges, silhouettes, and smooth edges
in a view of type UF_VIEW_MODEL_TYPE.
Function
UF_VIEW_ask_surface_display_options returns the edge display options of a view, and function
UF_VIEW_set_surface_display_options modifies the edge display options of a view.
The following constants are valid :
UF_VIEW_HIDDEN_EDGES_SOLID,
UF_VIEW_HIDDEN_EDGES_INVIS,
UF_VIEW_HIDDEN_EDGES_DASHED,
UF_VIEW_HIDDEN_EDGES_GRAY_THIN