Why only 1 intersection point instead of 2?

[Anonymous]

Hello,

In the attachment please find the drawing there is a little blue line and a red region in it. When I check with DIST command both the ends of the line are with distance 0.00000000 to the region. But when I apply intersectwith method to them I get only 1 intersection. This is a sample only, I face this issue regularly.

What can I do?

Thanks,

    Private Sub Button31_Click(sender As Object, e As EventArgs) Handles Button31.Click
        Dim R1 As AcadEntity = Nothing, R2 As AcadEntity = Nothing
        Ut.GetEntity(R1, "seç")
        Ut.GetEntity(R2, "seç")
        Dim inters As Object = R1.IntersectWith(R2, AcExtendOption.acExtendNone)
    End Sub


or




            Dim entMain As Autodesk.AutoCAD.DatabaseServices.Entity = tr.GetObject(id, Autodesk.AutoCAD.DatabaseServices.OpenMode.ForRead)

            'Setup 3d plane and point collection
            Dim myPlaneWCS As Plane = New Plane(New Point3d(0, 0, 0), New Vector3d(0, 0, 1))
            Dim myIntPntCol As Point3dCollection = New Point3dCollection()
            Dim myintptr01 As IntPtr = New IntPtr()
            Dim myintptr02 As IntPtr = New IntPtr()
            'Get intersecting point collection
            entMain.IntersectWith(ent, Intersect.OnBothOperands, myPlaneWCS, myIntPntCol, myintptr01, myintptr02)

[fenton_webb]

What are you expecting exactly? Intersections at the start and end points, or an infinite number of intersections? The line lays totally ontop of the region outline...