Point.InPolygon is not correct

[chuongmep]

As description below, I created sample 3 point and one point to check, but value expect is not equal 1

  var testPolygon2 = new GShark.Geometry.Polygon(new Point3[] {
                new Point3(10.00,0,0.00),
                new Point3(-5.00,8.660,0.00),
                new Point3(-5.00,-8.660,0.00),
             
            });
            var p3 = new Point3(5, 0, 0);
var pointIsInside2 = p3.InPolygon(testPolygon2);
 pointIsInside2.Should().Be(1);

G-Shark/src/GShark/Geometry/Point3.cs

Line 647 in e1d76b6

public int InPolygon(Polygon polygon)

[sonomirco]

Thanks @chuongmep I will have a look at this.

https://en.wikipedia.org/wiki/Winding_number
https://stackoverflow.com/questions/46144205/point-in-polygon-using-winding-number/46144206
https:/hypar-io/Elements/blob/3a170783fce2964f47c9052ed28870db8ac47de1/Elements/src/Geometry/Polygon.cs#LL564C87-L564C100