From cc70fee4d74a08ee35cb493d2052daf53acb5919 Mon Sep 17 00:00:00 2001
From: Furgo <148809153+furgo16@users.noreply.github.com>
Date: Mon, 5 May 2025 09:24:16 +0200
Subject: [PATCH] BIM: correct planar check to avoid vertical/horizontal
 misclassification

---
 src/Mod/BIM/ArchComponent.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/Mod/BIM/ArchComponent.py b/src/Mod/BIM/ArchComponent.py
index ec4f19f6f2..1c2220fec6 100644
--- a/src/Mod/BIM/ArchComponent.py
+++ b/src/Mod/BIM/ArchComponent.py
@@ -1012,10 +1012,11 @@ class Component(ArchIFC.IfcProduct):
                 obj.PerimeterLength = 0
                 return
             else:
-                if  ((ang > 1.57) and
-                    (ang < 1.571) and
-                    f.Surface.isPlanar()):
-                    a += f.Area
+                if  ((ang > 1.57) and (ang < 1.571)):
+                    # Ignore non-planar vertical surfaces for area calculation
+                    # See https://github.com/FreeCAD/FreeCAD/issues/14687
+                    if f.Surface.isPlanar():
+                        a += f.Area
                 else:
                     fset.append(f)