From f8c40022941178a58deb8161eef493e98fcb6bed Mon Sep 17 00:00:00 2001
From: Jared Mulconry <jaredmulconry@gmail.com>
Date: Sat, 14 Oct 2017 22:45:00 +1100
Subject: [PATCH] Fixed a divide by zero error in IFCBoolean that was latent,
 but nevertheless a bug

---
 code/IFCBoolean.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/IFCBoolean.cpp b/code/IFCBoolean.cpp
index 8571a3c79..d250fbe36 100644
--- a/code/IFCBoolean.cpp
+++ b/code/IFCBoolean.cpp
@@ -272,7 +272,6 @@ bool IntersectsBoundaryProfile(const IfcVector3& e0, const IfcVector3& e1, const
         const IfcVector3& b0 = boundary[i];
         const IfcVector3& b1 = boundary[(i + 1) % bcount];
         IfcVector3 b = b1 - b0;
-        IfcFloat b_sqlen_inv = 1.0 / b.SquareLength();
 
         // segment-segment intersection
         // solve b0 + b*s = e0 + e*t for (s,t)
@@ -281,6 +280,7 @@ bool IntersectsBoundaryProfile(const IfcVector3& e0, const IfcVector3& e1, const
             // no solutions (parallel lines)
             continue;
         }
+        IfcFloat b_sqlen_inv = 1.0 / b.SquareLength();
 
         const IfcFloat x = b0.x - e0.x;
         const IfcFloat y = b0.y - e0.y;