From 0899abeb90f72817bfe2e8ce28d280d3b27d6efc Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Sun, 5 Jan 2014 12:44:53 -0500
Subject: [PATCH] Added testcase for #591

---
 testdata/scad/bugs/issue591.scad              |  25 ++++++++++++++++++
 tests/CMakeLists.txt                          |   1 +
 .../cgalpngtest/issue591-expected.png         | Bin 0 -> 8778 bytes
 .../opencsgtest/issue591-expected.png         | Bin 0 -> 8778 bytes
 4 files changed, 26 insertions(+)
 create mode 100644 testdata/scad/bugs/issue591.scad
 create mode 100644 tests/regression/cgalpngtest/issue591-expected.png
 create mode 100644 tests/regression/opencsgtest/issue591-expected.png

diff --git a/testdata/scad/bugs/issue591.scad b/testdata/scad/bugs/issue591.scad
new file mode 100644
index 00000000..f30142fd
--- /dev/null
+++ b/testdata/scad/bugs/issue591.scad
@@ -0,0 +1,25 @@
+// Creates the same "non-manifold" object (sharing one edge) using two techniques:
+// o linear_extrude of two 2D objects
+// o union of two linear_extrudes
+//
+// Subsequently cuts away the non-manifold part:
+// -> the first technique fails, the second one succeeds
+//
+module cutoff() {
+    difference() {
+        children();
+        translate([0,0,2.5]) cube(2, center=true);
+    }
+}
+
+cutoff() {
+    linear_extrude(height=3, scale=[0,1], convexity=2) {
+        translate([1,0,0]) square(1,true);
+        translate([-1,0,0]) square(1,true);
+    }
+}
+
+translate([0,2,0]) cutoff() {
+    linear_extrude(height=3, scale=[0,1]) translate([1,0,0]) square(1,true);
+    linear_extrude(height=3, scale=[0,1]) translate([-1,0,0]) square(1,true);
+}
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ed5bdc3f..a1c5cc6c 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -891,6 +891,7 @@ list(APPEND BUGS_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue495.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue578b.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue582.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue584.scad
+                       ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue591.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue585.scad)
 
 list(APPEND OPENCSGTEST_FILES ${BUGS_FILES})
diff --git a/tests/regression/cgalpngtest/issue591-expected.png b/tests/regression/cgalpngtest/issue591-expected.png
new file mode 100644
index 0000000000000000000000000000000000000000..07e1559f478d446b72d144453abc299f9fac3fbe
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diff --git a/tests/regression/opencsgtest/issue591-expected.png b/tests/regression/opencsgtest/issue591-expected.png
new file mode 100644
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