// traverse the gpc_polys and build a unified node list and a set
// of Triangle PSLG that reference the node list by index
// (starting at zero)
gpc_polygon *gpc_poly;
// traverse the gpc_polys and build a unified node list and a set
// of Triangle PSLG that reference the node list by index
// (starting at zero)
gpc_polygon *gpc_poly;