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    $\begingroup$ One could also use Graphics`Mesh`InPolygonQ, which has the same 2 argument syntax as Graphics`Mesh`PointWindingNumber. The former also takes a Method option, which I haven't explored yet... $\endgroup$ Commented Aug 14, 2012 at 16:37
  • $\begingroup$ I implement windnig number myself but this is better, I bet faster. A newbie Q: how can I see how this functions is coded, its syntax? I can see there's also PolygonWindingNumber in ver. 9 and I'd like to see what it does if I can. $\endgroup$ Commented Apr 19, 2013 at 8:16
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    $\begingroup$ @BoLe Unfortunately, it doesn't look like the code for this one is accessible... In general, the tighter a function's integration with the kernel, the harder it is (almost impossible) to read its definitions (e.g. Pick, Cases, etc.). You can, however, read them for several other functions that are implemented in top level Mathematica. Usually all that one needs to do is to clear the attributes, read the definitions and follow the rabbit hole of internal definitions. However, instead of that, I'll recommend this answer. Prepare to be amazed :) $\endgroup$ Commented Apr 19, 2013 at 13:41
  • $\begingroup$ @rm-rf As I tested it, this undocumented Graphics`Mesh`PointWindingNumber is not working in V10, so maybe undocumented function is dangerous? $\endgroup$ Commented Dec 3, 2014 at 0:43
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    $\begingroup$ @rm-rf Thank you! kguler told me using ??*`*PointWindingNumber* could see which package that PointWindingNumber belongs to. But I found V10 gives both Mesh and PolygonUtils, you can see here imgur.com/bCIANiR, then why Mesh didn't work any more? $\endgroup$ Commented Dec 3, 2014 at 6:35