How to get the face reference (2025)

Jeremy,

I am still having some issues with this. Not quite sure how to solve my problem. I thought it might be helpful if I elaborate a little further. Under a single transaction, I am placing a floor, getting its geometry (faces), then placing a faced-based toilet family on the floor. This happens all before the transaction is committed.

The useris given two options: they can create LAYOUT C(ModTypeStr.Equals("C")): which includes kitchen, laundry, and bathroom or LAYOUT B(ModTypeStr.Equals("B")): which includes bedroom, hallway, and bathroom. Each of these units (walls, floor, doors, etc.) are all built with the same code with if statements that make the location points different based on the users selection. If the user selects LAYOUT C there are not issues, but if the user selects LAYOUT B, the Geometry Element of the floor comes back null. If I am creating the floor the exact same way, how can it come back null only for LAYOUT B? I am so confused!! 😞

If I choose not to install the toilet, the floor is placed correctly. After doing this, I use the RevitLookup tool (WHICH IS AMAZING - THANKS) and Iam able to see the floor which was created. It has faces and geometry. Not sure why I can't get to it. Iresearched GetSymbolGeometry thinking maybe this is what I needed to be using butif I am getting a null GeometryElement, I am unsure on how I can initialize theGetSymbolGeometry method.

Thanks in advance for all of your help!

Elizabeth

(email address changed)

Code Dump --- Placing Floor

#region Place Floor //Start array for floor and Create Floor CurveArray flrCurves = new CurveArray(); flrSt = new XYZ(startPoint.X + massWidthDbl, startPoint.Y, startPoint.Z); flr02Pt = startPoint; flr03Pt = new XYZ(startPoint.X, startPoint.Y - massLengthDbl, startPoint.Z); flr04Pt = new XYZ(startPoint.X + massWidthDbl, startPoint.Y - massLengthDbl, startPoint.Z); flrCurves.Append(Line.CreateBound(flrSt, flr02Pt)); flrCurves.Append(Line.CreateBound(flr02Pt, flr03Pt)); flrCurves.Append(Line.CreateBound(flr03Pt, flr04Pt)); flrCurves.Append(Line.CreateBound(flr04Pt, flrSt)); floorType = GetFloorType(doc, "FIN_Wood 3/4\" (6\" Plank)", out flrThk); finishedFloor = doc.Create.NewFloor(flrCurves, floorType, modLevel, false, XYZ.BasisZ); finishedFloor.get_Parameter(BuiltInParameter.FLOOR_HEIGHTABOVELEVEL_PARAM).Set(0); //Need to get the instance so instance parameters can be fetched finFlrElement = doc.GetElement(finishedFloor.Id); finFlrInst = finFlrElement as Floor; //Attach Module Guid to Floor modGuid = finFlrInst.get_Parameter(ModuleGuid); if (modGuid == null) { MessageBox.Show(paramEx.Message, "Revit Preparation Incomplete!"); throw paramEx; } modGuid.Set(guid.ToString()); //Add Floor to Group grpIDList.Add(finishedFloor.Id); #endregion

Code Dump -- Placing Toilet

#region Place Toilet //Check to see if Toilet Family exists and Create if (modTypeStr.StartsWith("B") || modTypeStr.StartsWith("C")) { Family toiletFam = null; FamilySymbol toileSymbol = null; fileName = @"C:\MyDrive\Revit_2016\Families\Toto_Aquia_Toilet.rfa"; familyName = "Toto_Aquia_Toilet"; famExists = DoesFamilyExist(doc, fileName, familyName, out toiletFam); if (famExists == false) toiletFam = LoadFamilySubT(doc, fileName, familyName); ISet<ElementId> toiletFamIds = toiletFam.GetFamilySymbolIds(); foreach (ElementId id in toiletFamIds) { toileSymbol = toiletFam.Document.GetElement(id) as FamilySymbol; if (!toileSymbol.IsActive) toileSymbol.Activate(); break; } toilet = null; if (modTypeStr.StartsWith("B")) { toiletLoc = new XYZ(LaundryRSt.X + (intLaundryRWallThk * 0.5) + 1.5, startY + wall01Thk, flrSt.Z); toiletPt2 = toiletLoc.Add(XYZ.BasisZ); } else if (modTypeStr.StartsWith("C")) { toiletLoc = new XYZ(BWall02St.X + (wall02dThk * 0.5) + 1.9634, BWall02St.Y + (intToiletWallThk * 0.5), flrSt.Z); toiletPt2 = toiletLoc.Add(XYZ.BasisZ); } toiletAxis = Line.CreateBound(toiletLoc, toiletPt2); //Get Face of floor for toilet because it is a face-based family. Face face = null; Autodesk.Revit.DB.Options geomOptions = new Autodesk.Revit.DB.Options(); geomOptions.View = doc.ActiveView; geomOptions.ComputeReferences = true; GeometryElement faceGeom = finishedFloor.get_Geometry(geomOptions); foreach (GeometryObject geomObj in faceGeom) { Solid geomSolid = geomObj as Solid; if (null != geomSolid) { foreach (Face geomFace in geomSolid.Faces) { face = geomFace; break; } break; } } // Get the center of the wall BoundingBoxUV bboxUV = face.GetBoundingBox(); UV center = (bboxUV.Max + bboxUV.Min) / 2.0; XYZ normal = face.ComputeNormal(center); XYZ refDir = normal.CrossProduct(XYZ.BasisZ); toilet = doc.Create.NewFamilyInstance(face, toiletLoc, refDir, toileSymbol); if (modTypeStr.StartsWith("B")) { toilet.IsWorkPlaneFlipped = true; ElementTransformUtils.RotateElement(doc, toilet.Id, toiletAxis, mathMethods.DegreesToRadians(0.0)); } else if (modTypeStr.StartsWith("C")) { toilet.IsWorkPlaneFlipped = true; ElementTransformUtils.RotateElement(doc, toilet.Id, toiletAxis, mathMethods.DegreesToRadians(180.0)); } if (toilet != null) { //Attach Module GUID modGuid = toilet.get_Parameter(ModuleGuid); try { modGuid.Set(guid.ToString()); } catch { MessageBox.Show(paramEx.Message, "Revit Preparation Incomplete!"); throw paramEx; } //Add to Group grpIDList.Add(toilet.Id); } } #endregion