topic Why don't work ReferenceIntersector in Revit API Forum

Why don't work ReferenceIntersector

AndrewButenko — Fri, 16 Feb 2018 07:54:31 GMT

I try get point on toposurface with my function:

Function GetPointOnTopoSurface(doc As Document, p As XYZ, Dir As Integer) As XYZ

        ' Find a 3D view to use for the ReferenceIntersector constructor
        Dim collector As New FilteredElementCollector(doc)
        Dim isNotTemplate As Func(Of View3D, Boolean) = Function(v3) Not (v3.IsTemplate)
        'Dim view3D As View3D = collector.OfClass(GetType(View3D)).Cast(Of View3D)().First(isNotTemplate)
        Dim view3D As View3D = collector.OfClass(GetType(View3D)).Cast(Of View3D)().Where(Function(x) x.Name = doc.ActiveView.Name).First(isNotTemplate)

        '---------------------------
        'Draw line 
        Dim q As New XYZ(p.X, p.Y, p.Z + Dir * 150)
        Dim l As Line = Line.CreateBound(p, q)
        drawCurveDoc(doc, l)
        '---------------------------

        Dim pTop As XYZ = p

        ' Project in the negative Z direction down to the floor.
        Dim rayDirection As New XYZ(0, 0, Dir)

        Dim filter As New ElementClassFilter(GetType(TopographySurface))



        Dim refIntersector As New ReferenceIntersector(filter, FindReferenceTarget.All, view3D)

        If IsNothing(refIntersector.FindNearest(pTop, rayDirection)) Then
            Return p
        End If

        Dim referenceWithContext As ReferenceWithContext = refIntersector.FindNearest(pTop, rayDirection)
        Dim reference As Reference = referenceWithContext.GetReference()
        Dim intersection As XYZ = reference.GlobalPoint


        Return intersection



    End Function

I use Dir = 1 and Dir = -1. Function find some points. But some points don't find.

Re: Why don't work ReferenceIntersector

jeremytammik — Fri, 16 Feb 2018 11:06:07 GMT

Dear Andrew,

Your code looks perfectly all right to me.

Maybe you should create a complete minimal reproducible case to prove the problem exists:

http://thebuildingcoder.typepad.com/blog/about-the-author.html#1b

I could pass that on to the development team for analysis.

Thank you!

Cheers,

Jeremy

Re: Why don't work ReferenceIntersector

Admin.CTI — Tue, 24 Jul 2018 20:09:20 GMT

I have the exact same problem. Maybe the reference intersector does not work on topos?

Re: Why don't work ReferenceIntersector

AndrewButenko — Wed, 25 Jul 2018 05:19:15 GMT

Hi!

I figured it out. If the ray hits the topoline between mesh(triangls), then the function assumes that the topo does not exist.

Re: Why don't work ReferenceIntersector

Admin.CTI — Mon, 02 Mar 2020 20:16:45 GMT

Thank you. I actually solved in another way that i cannot remember. But thanks for the support.