Curtain wall `Element Bounding Geometry` outcome not as expected

Muhammad_Saqlain_Awa · 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

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Curtain wall `Element Bounding Geometry` outcome not as expected

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