From 83233b035f8f2a0984580640f9545718f245d81b Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Sat, 3 Sep 2011 22:57:58 +0200
Subject: Added note about 2D union bug


diff --git a/doc/TODO.txt b/doc/TODO.txt
index dd46b7b..5fe22bb 100644
--- a/doc/TODO.txt
+++ b/doc/TODO.txt
@@ -6,6 +6,7 @@ o Tesselation via GLU sometimes produces strange results
 o Export STL: Exports existing CGAL model even though the current model is changed, but not CGAL rendered
 o Look into the polygon winding and rotate_extrude() problem reported by Britton
 o CGAL Aff_transformation_3 doesn't support non-affine transformations (non-aff-matrix.scad)
+o 2D union of polygons with a touching vertex doesn't work. see testdata/scad/bugs/polygon-touch.scad
 
 STL Import BUGS
 ---------------
diff --git a/testdata/scad/bugs/polygon-touch.scad b/testdata/scad/bugs/polygon-touch.scad
new file mode 100644
index 0000000..afa2938
--- /dev/null
+++ b/testdata/scad/bugs/polygon-touch.scad
@@ -0,0 +1,5 @@
+# Somehow the 2D union/tessellation algorithm doesn't support touching polygons
+# Changing translate([-10,-10,0]) to translate([-9.99,-9.99,0]) works
+
+square([10,10]);
+translate([-10,-10,0]) square([10,10]);
-- 
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