Curtain wall `Element Bounding Geometry` outcome not as expected

ctu6 · May 30, 2023, 5:34am

Hi there,

While using Element Bounding Geometry for curtain wall;
As image shown below, 2 elements are identical but only base level different,
the Bounding Geometry result differently… Any ideas?

CW BOUNDING.gh (6.3 KB)
CW BOUNDING.rvt (5.1 MB)

Japhy · May 30, 2023, 12:49pm

I’m seeing this as well, thanks for reporting. Its adding in the levels below to the overall height for some reason.

Using a bounding box with a plane derived from the Element will give an accurate representation.

ctu6 · May 30, 2023, 12:59pm

Hi @Japhy
The bounding box method may not work with a curved curtain wall condition, hopefully it will get resolve soon

ctu6 · June 7, 2023, 4:12am

Just found its the same result for Basic Wall type.

Japhy · June 7, 2023, 3:41pm

Yes, this is a bug and in the queue to be fixed.

MSAwan · April 10, 2025, 9:45am

Recently, I encountered the same issue.

When I examined the source code on GitHub, I noticed that the top curve is translated using the following line:

side1TopCurve.Translate(0, 0, fromPoint.Z + height);

However, since fromPoint.Z already includes the base elevation and side1TopCurve starts at that same elevation, this line adds extra elevation to a curve that’s already correctly positioned at the base. As a result, the bounding Brep becomes too tall and extends beyond the actual top of the wall in Revit.

Suggestion to Improve the Code

Translate the duplicated top curve only by the wall height, not by fromPoint.Z + height:

side1TopCurve.Translate(0, 0, height);

This ensures that the top curve moves correctly from the base elevation (already applied earlier) to the intended top elevation of the wall.

GitHub Source

github.com/mcneel/rhino.inside-revit

src/RhinoInside.Revit.GH/Components/Element/BoundingGeometry.cs

1.x

using System;
using System.Collections.Generic;
using System.Linq;
using Grasshopper.Kernel;
using Grasshopper.Kernel.Parameters;
using Rhino.Geometry;
using ARDB = Autodesk.Revit.DB;

namespace RhinoInside.Revit.GH.Components.Geometry
{
  using Convert.Geometry;
  using External.DB.Extensions;

  public class ElementBoundingGeometry : Component
  {
    public override Guid ComponentGuid => new Guid("3396DBC4-0E8F-4402-969A-EF5A0E30E093");
    public override GH_Exposure Exposure => GH_Exposure.secondary;
    protected override string IconTag => "BG";

    public ElementBoundingGeometry() : base

This file has been truncated. show original

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Curtain wall `Element Bounding Geometry` outcome not as expected

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