func EdgeFlag(flag bool) {
	C.glowEdgeFlag(gpEdgeFlag, (C.GLboolean)(boolToInt(flag)))
}
func EdgeFlag(flag bool) {
	C.glowEdgeFlag(gpEdgeFlag, (C.GLboolean)(boolToInt(flag)))
}
func EdgeFlag ( flag bool ) { C . glowEdgeFlag ( gpEdgeFlag , ( C . GLboolean ) ( boolToInt ( flag ) ) ) }
// flag edges as either boundary or nonboundary
flag edges as either boundary or nonboundary