From 4f280b13347953a4781de9cbcba39f6e9d4e98a7 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Tue, 12 Jun 2018 16:15:28 +0200
Subject: [PATCH] higher fuzz on half spaces

---
 src/ifcgeom/IfcGeomShapes.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/ifcgeom/IfcGeomShapes.cpp b/src/ifcgeom/IfcGeomShapes.cpp
index b3c09014f2..579d886a1b 100644
--- a/src/ifcgeom/IfcGeomShapes.cpp
+++ b/src/ifcgeom/IfcGeomShapes.cpp
@@ -549,7 +549,12 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcBooleanResult* l, TopoDS_Shape
 		return false;
 	}
 
+#if OCC_VERSION_HEX < 0x60900
 	bool valid_result = boolean_operation(s1, s2, occ_op, shape);
+#else
+	const double fuzz = is_halfspace ? getValue(GV_PRECISION) * 10. : -1.;
+	bool valid_result = boolean_operation(s1, s2, occ_op, shape, fuzz);
+#endif
 
 	if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_DIFFERENCE) {
 		// In case of a subtraction, a check on volume is performed.