topic Re: Duct hanger - place family instance Revit API in Revit API Forum

Duct hanger - place family instance Revit API

Or.levi — Sat, 05 Mar 2022 15:42:16 GMT

hey,

i'm trying to place a family using the API (c#).

When using the NewFamiltInstace overloaded method that takes (location, symbol,host, level, structural) - i'm expecting to get the instance of the hanger family in the level i have inserted, and in the elevation of the host ( the duct).

instead - i get the duct hanger in the ground floor no matter what i'm doing, can any one understand why, and what sholud i do to get it in the desired level?

the code from my transaction:

using (Transaction trans = new Transaction(doc, "Place Family")) { trans.Start(); int indx = 0; foreach (XYZ hanger_xyz in hangerCoordinates) { if (!hangerSymbol.IsActive) { hangerSymbol.Activate(); } doc.Create.NewFamilyInstance(hanger_xyz, hangerSymbol,duct,level, Autodesk.Revit.DB.Structure.StructuralType.NonStructural); } trans.Commit(); }

Re: Duct hanger - place family instance Revit API

caroline.gitonga — Sat, 05 Mar 2022 18:02:52 GMT

Hi @Or.levi ,

Thank you for raising this question.

I believe you need to get the level on which your host element resides first, in this case the level of the duct.

// get ducts's level for hanger creation
Level level = document.GetElement(duct.LevelId) as Level;

This is the level object you need to pass to the NewFamilyInstance overload.

You can refer to https://www.revitapidocs.com/2022/168d4c67-73dd-d7c8-4969-12846eeaddfa.htmfor more details.

Let me know if you get the solution,

Thanks

Re: Duct hanger - place family instance Revit API

Or.levi — Sat, 05 Mar 2022 20:25:00 GMT

hey @ caroline.gitonga
thank you for your response!
unfortunately it did not change the situation.
The duct hangers are still being placed only in the ground floor for some reason.
i also tried inserting name for the level by user input like so -

// get user input for desired level string inputLevelName = Microsoft.VisualBasic.Interaction.InputBox("Please insert the EXACT name of the desired level", "Insert Level", ""); //Get Level(in order to create hanger element) Level level = new FilteredElementCollector(doc) .OfCategory(BuiltInCategory.OST_Levels) .WhereElementIsNotElementType() .Cast<Level>() .First(x => x.Name == inputLevelName);

[still did not work..]

any idea why?

thanks!

Re: Duct hanger - place family instance Revit API

Or.levi — Mon, 07 Mar 2022 21:00:21 GMT

figured it out.

After testing all of the 11 overloaded methods for newFamilyInstance and their required arguments, and snooping around with RevitLookUp, i managed to get the right overloded method which is:

FamilyInstance familyInstance = doc.Create.NewFamilyInstance(face, hanger_xyz, new XYZ(0, 1, 0), hangerSymbol);

face==> as a Referemce object (extracted it from a face Face that i got from a GeoElement that i got from the desired level's floor)

hanger_xyz==>an XYZ location

new XYZ(0,1,0)==> a direction of the family as it is when it's attached to a cielling host ( got it from revitLookUp)

hangerSymbol ==> the familysymbol.

cheers!

Re: Duct hanger - place family instance Revit API

Chris-VC_Studio — Sun, 12 Jun 2022 17:11:47 GMT

Good day, Or.levi

I am a total noob when with C#, and I would like to write a transaction similar to yours except with flow arrows for pipe. I was wondering if you wouldn't mind sharing all your code from the duct selection to the transaction so I could adopt my coding to work pipe and my flow arrow families.