 xref comp sy mac programm 59851 comp graphic 39663 newsgroup comp sy mac programm comp graphic path edu!da-new harvard edu!noc net!howland reston an net!usc!elroi jpl nasa gov!decwrl!csu edu!netcom com!nagl from nagl netcom john nagl subject re point polygon routin need messag-id organ netcom on-line commun servic 408 241-9760 guest refer 8fxkxao00wb7m nofo andrew date mon 17 mai 1993 17 32 43 gmt line 18 andrew lewi tepper write routin standard for polygon point p1 pn point p tabl t 1 angl p1 p p2 t 2 angl p2 p p3 t angl pn p p1 express angl -pi angl pi add entri tabl if sum 0 point if sum + - pi point insid if point + - xpi strang polygon if ani angl + -pi point border neat can extend 3d? john nagl 