Origin of planar face

[phongthehuynh95]

Hi,

I am trying to get curveloop from the element.

I have rectangular parallelepiped element, i want get the curveloop from the top face of it.

But when i access into the planar face i realized that: the origin of planar face's different from the origin of element. When i move the element wherever i want, planar face still be there. It makes me confused, i dont understand the different, it must be the same, right?

So i can neither move the face nor change origin. Do we have another way to get curveloop from face with the same element origin?

Appreciate for any comments.

Regards

[jeremytammik]

What are you trying to achieve, and why?

I think an illustration would help understand better... even just a minimal hand-drawn sketch...

[FAIR59 · Accepted solution]

If the origin of the planar face doesn't move when you move the familyInstance, then the face belongs to the SymbolGeometry, and you need to apply a Transform ( == familyInstance.GetTransForm() ) to get the "world coordinates of the face.

You can use the  ExporterIFCUtils.UsesInstanceGeometry() method to check .

PlanarFace _face;
FamilyInstance inst =element as FamilyInstance;
if(   !ExporterIFCUtils.UsesInstanceGeometry(inst))
{
	Transform trans =inst.GetTransform();
	XYZ origin = trans.OfPoint( _face.Origin);
}

[phongthehuynh95]

Thanks for your reply. Thats exactly whats im looking for.

Regards.

[Anonymous]

Hi!

I am having the problem with getting the planar face to create a pipe connector.

ConnectorElement.CreatePipeConnector(doc, DomesticColdWater, PlanarFace)

What should I input there and how can I get a planar face? Could you please help with the code. I am using the RevitPythonShell for that. Thank you!

[jlpgy]

Hi @Anonymous  :

I Copied the following from Revit API document:

public void CreatePipeConnectors(UIDocument uiDocument, Extrusion extrusion)
{
    // get the faces of the extrusion
    Options geoOptions = uiDocument.Document.Application.Create.NewGeometryOptions();
    geoOptions.View = uiDocument.Document.ActiveView;
    geoOptions.ComputeReferences = true;

    List<PlanarFace> planarFaces = new List<PlanarFace>();
    Autodesk.Revit.DB.GeometryElement geoElement = extrusion.get_Geometry(geoOptions);
    foreach (GeometryObject geoObject in geoElement)
    {
        Solid geoSolid = geoObject as Solid;
        if (null != geoSolid)
        {
            foreach (Face geoFace in geoSolid.Faces)
            {
                if (geoFace is PlanarFace)
                {
                    planarFaces.Add(geoFace as PlanarFace);
                }
            }
        }
    }

    if (planarFaces.Count > 1)
    {
        // Create the Supply Hydronic pipe connector
        //PipeConnector connSupply = 
        //    uiDocument.Document.FamilyCreate.NewPipeConnector(planarFaces[0].Reference, 
        //                                           PipeSystemType.SupplyHydronic);
        ConnectorElement connSupply =
            ConnectorElement.CreatePipeConnector(uiDocument.Document, PipeSystemType.SupplyHydronic, planarFaces[0].Reference);
        Parameter param = connSupply.get_Parameter(BuiltInParameter.CONNECTOR_RADIUS);
        param.Set(1.0); // 1' radius
        param = connSupply.get_Parameter(BuiltInParameter.RBS_PIPE_FLOW_DIRECTION_PARAM);
        param.Set(2);

        // Create the Return Hydronic pipe connector
        //PipeConnector connReturn =
        //    uiDocument.Document.FamilyCreate.NewPipeConnector(planarFaces[1].Reference,
        //                                           PipeSystemType.ReturnHydronic);
        ConnectorElement connReturn =
            ConnectorElement.CreatePipeConnector(uiDocument.Document, PipeSystemType.ReturnHydronic, planarFaces[1].Reference);
        param = connReturn.get_Parameter(BuiltInParameter.CONNECTOR_RADIUS);
        param.Set(0.5); // 6" radius
        param = connReturn.get_Parameter(BuiltInParameter.RBS_PIPE_FLOW_DIRECTION_PARAM);
        param.Set(1);
    }
}

Also the screen shot of the API document is also attached which I think should be easier to read.

Notice that the

ConnectorElement..::..CreatePipeConnector Method

works for Family Document, while this post is about working in Revit RVT document.

Luckily, they share almost the same tech to fetch a PlanarFace from Revit DB 🙂