topic Re: what's the tolerance of unique point3dcollection used for SelectWindowPolygon in .NET Forum

what's the tolerance of unique point3dcollection used for SelectWindowPolygon

wesbird — Mon, 15 Aug 2022 22:27:31 GMT

hi,

I know, when you do SelectWindow, SelectCrossingWindow, SelectWindowPolygon, SelectCrossingPolygon, the first argument Point3dCollection cannot be duplicate and self intersected. I'm just not sure, what's the tolerance to make the Point3dCollection unique.

current Tolerance.Global.EqualPoint: 1E-10.

my SelectWindowPolygon does not work, beside the duplicate point in Point3dCollection, what else could be?

Thanks

Wes

Re: what's the tolerance of unique point3dcollection used for SelectWindowPolygon

cuongtk2 — Thu, 18 Aug 2022 11:50:49 GMT

You must control the order of points in the Point3dColletion.

It's best to draw 1 polyline from that collection to check its boundary

Re: what's the tolerance of unique point3dcollection used for SelectWindowPolygon

cuongtk2 — Thu, 18 Aug 2022 12:00:01 GMT

Polyline pline = new Polyline();
foreach (Point3d pt in collection)
{
pline.AddVertexAt(pline.NumberOfVertices, pt.ToPoint2d(), 0, 0, 0);
}

Re: what's the tolerance of unique point3dcollection used for SelectWindowPolygon

Activist_Investor — Wed, 24 Aug 2022 16:39:52 GMT

All of the selection methods that you cite have a tolerance that is one display pixel at the current display magnification. IOW, it is equivalent to using the pointing device to make the selection.