From 4b57a7bdd6d0b5e17e7d7a82cfa30a66bca4da22 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Sat, 26 Jan 2019 15:00:20 +0100
Subject: [PATCH] Set a lower bound tot faceset_helper::epsilon

---
 src/ifcgeom/IfcGeomFunctions.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/ifcgeom/IfcGeomFunctions.cpp b/src/ifcgeom/IfcGeomFunctions.cpp
index fff22622f9..f0764ccc1f 100644
--- a/src/ifcgeom/IfcGeomFunctions.cpp
+++ b/src/ifcgeom/IfcGeomFunctions.cpp
@@ -3822,6 +3822,12 @@ IfcGeom::Kernel::faceset_helper::faceset_helper(Kernel* kernel, const IfcSchema:
 	}
 
 	eps_ = kernel->getValue(GV_PRECISION) * 10. * (std::min)(1.0, bdiff);
+	
+	if (eps_ < Precision::Confusion()) {
+		// occt uses some hard coded precision values, don't go smaller than that.
+		// @todo, can be reset though with BRepLib::Precision(double)
+		eps_ = Precision::Confusion();
+	}
 
 	std::map<std::pair<int, int>, int> edge_use;