isPointInPolygon2D Question

[Innula Zenovka]

I'm trying to get a handle on the order in which I need to give the vector coordinates for IsPointInPolygon2D.   As far as I can make out, if the area is vaguely rectangular, I need to go bottom left, top left, top right, bottom right ([<1,1,0>, <1,2,0>, <2,2,0>, <2,1,0>] in the wiki example).  

What do I do if it's a more complex shape -- a pentagon for example, or even, heaven help us, a pentagram?

[Tabris Daxter]

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Innula Zenovka wrote:

What do I do if it's a more complex shape -- a pentagon for example, or even,

heaven help us

,

a pentagram

?

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asking the wrong guy

[Void Singer]

I believe that the coordinates should be around the perimeter in order... I can't actually confirm that and the original doesn't say, but the original seems to suggest that (I have some notes about it on the talk page)....

[Innula Zenovka]

Thanks, Void.   I've now looked at what you say on the talk page.    Did your tests suggest  whether it matters where the list starts on the border of the shape, or can I start anywhere and join up the points in the expected order?   (I can test it myself, of course, but I won't bother making lots of textures if the answer's aleady known).

I'm making something for an RP sim, for which I need to know where people are when various things happen.   Dividing the land into parcels isn't really practicable, not least because I've got some rather odd shapes with which to deal.

[Void Singer]

as far as I could tell it doesn't matter where you start, as long as you traveled around the edge, and I don't think 0,0 is supposed to be a valid point on the edge.... but if it can be then it need to be the last one I think