From df81490f86798153f253d55cfec9231cf5a5fabe Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Fri, 27 Mar 2020 13:26:34 +0100
Subject: [PATCH] Don't run wire intersection checks on parallel edge pairs

---
 src/ifcgeom/IfcGeomFunctions.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ifcgeom/IfcGeomFunctions.cpp b/src/ifcgeom/IfcGeomFunctions.cpp
index dac5b3b00a..b2a75f0083 100644
--- a/src/ifcgeom/IfcGeomFunctions.cpp
+++ b/src/ifcgeom/IfcGeomFunctions.cpp
@@ -3736,7 +3736,7 @@ bool IfcGeom::Kernel::wire_intersections(const TopoDS_Wire& wire, TopTools_ListO
 			);
 
 			// @todo: extend this to work in case of multiple extrema and curved segments.
-			const bool unbounded_intersects = (ecc.NbExtrema() == 1 && ecc.Distance(1) < eps);
+			const bool unbounded_intersects = (!ecc.Extrema().IsParallel() && ecc.NbExtrema() == 1 && ecc.Distance(1) < eps);
 			if (unbounded_intersects) {
 				ecc.Parameters(1, U1, U2);