Revit 2014 Form Extrusion Height

[Anonymous]

Hi all,

in revit 2014 when I try to use a code to set extrusion height in conceptual mass, it fails when I try to set extrusion.TopOffset, this is mycode.

Any idea or samples to set TopOffset in conceptual mass from revit api?

Thanks in advance

Max

  using (SubTransaction sub1 = new SubTransaction(famDoc))
                    {
                        sub1.Start();
                        extrusion = famDoc.FamilyCreate.NewExtrusionForm(true, array2, xyz2);                      
                        sub1.Commit();
                    }
                    if (null != extrusion)
                    {
                        listaEXT.Add(extrusion);
                        using (SubTransaction sub2 = new SubTransaction(famDoc))
                        {
                            sub2.Start();
                            extrusion.TopOffset = h;
                            sub2.Commit();
                        }
                    }

[jeremytammik · Accepted solution]

Dear Max,

Looking at the Form.TopOffset property in the Revit API help file RevitAPI.chm, I note the statement:

"Retrieve/set the top offset of the form object. It is only valid for locked form."

Question: is your form locked?

No, obviously not, since you just created it.

If you are simply trying to set the extrusion height, I suggest you look here at some examples:

http://thebuildingcoder.typepad.com/blog/2014/10/creating-a-sloped-wall.html

http://thebuildingcoder.typepad.com/blog/2011/06/creating-and-inserting-an-extrusion-family.html

Note what the documentation of the FamilyItemFactory.NewExtrusionForm method states about the direction argument:

direction: Type: Autodesk.Revit.DB.XYZ; The direction of extrusion, with its length the length of the extrusion. The direction must be perpendicular to the plane determined by profile. The length of vector must be non-zero.

RTFM, my friend.

Saves you a subtransaction as well.

Cheers,

Jeremy