From d59fc73125184432dc3cf8b17e76a4766a3c9ed0 Mon Sep 17 00:00:00 2001
From: Kliment Yanev <kliment.yanev@gmail.com>
Date: Wed, 28 Sep 2011 15:10:09 +0200
Subject: [PATCH] Prevent division by zero in stltool, at the risk of
 non-normalized normals.

---
 stltool.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/stltool.py b/stltool.py
index 130fdad..3573215 100644
--- a/stltool.py
+++ b/stltool.py
@@ -8,6 +8,8 @@ def genfacet(v):
     vecb=[v[2][0]-v[1][0],v[2][1]-v[1][1],v[2][2]-v[1][2]]
     vecx=cross(veca,vecb)
     vlen=math.sqrt(sum(map(lambda x:x*x,vecx)))
+    if vlen==0:
+        vlen=1
     normal=map(lambda x:x/vlen, vecx)
     return [normal,v]