From ff0326ff9a2fc24f712781e903150fee24d0a306 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <kloeckner@haamster.rice.edu>
Date: Fri, 10 Oct 2008 16:34:09 -0500
Subject: [PATCH] Fix a sign bug in extrusion. Improve an error message. Make
 not zip-safe.

---
 setup.py          | 4 ++--
 src/python/tet.py | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/setup.py b/setup.py
index 576c070..a707197 100644
--- a/setup.py
+++ b/setup.py
@@ -112,8 +112,8 @@ def main():
               extra_compile_args=conf["CXXFLAGS"],
               extra_link_args=conf["LDFLAGS"],
               ),
-            ]
-         )
+            ],
+          zip_safe=False)
 
 
 
diff --git a/src/python/tet.py b/src/python/tet.py
index 5eedb84..a3df03d 100644
--- a/src/python/tet.py
+++ b/src/python/tet.py
@@ -230,7 +230,7 @@ def _is_same_float(a, b, threshold=1e-10):
         a,b = b,a
 
     # now abs(a) <= abs(b) always
-    return abs(b) < threshold or abs(a-b)<threshold*b
+    return abs(b) < threshold or abs(a-b)<threshold*abs(b)
 
 
 
@@ -399,7 +399,9 @@ def generate_extrusion(rz_points, base_shape, closure=EXT_OPEN,
                 if rz_points[i][0] == 0:
                     assert len(ring_points) == 1
                 else:
-                    assert len(ring_points) == len(base_shape)
+                    assert len(ring_points) == len(base_shape), \
+                            ("Ring points length (%d) does not match base shape length (%d)"
+                                    % (len(ring_points), len(base_shape)))
 
                 rings[i] = ring_points
 
-- 
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