From e2ae2a4a896c95d1373ad3fd9ebb1f8fe256d269 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Sat, 28 Sep 2024 19:44:19 +0200
Subject: [PATCH] Fix negative modelo #5509

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

diff --git a/src/ifcgeom/profile_helper.cpp b/src/ifcgeom/profile_helper.cpp
index 8a2c9860ee..5c14259f65 100644
--- a/src/ifcgeom/profile_helper.cpp
+++ b/src/ifcgeom/profile_helper.cpp
@@ -128,7 +128,7 @@ taxonomy::loop::ptr ifcopenshell::geometry::profile_helper(const taxonomy::matri
 
 	std::vector<profile_point_with_edges> pps(points.size());
 	for (int b = 0; b < points.size(); ++b) {
-		int c = (b - 1) % points.size();
+		int c = (b + points.size() - 1) % points.size();
 		pps[b] = { Eigen::Vector2d(points[b].xy[0], points[b].xy[1]), points[b].radius, loop->children[c], loop->children[b] };
 	}