From 072d7170e62fea76f54cca66d2f6667c4374b1a0 Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Thu, 8 Sep 2011 03:23:42 +0200
Subject: Catch a non-simple polyhedron before export as this crashes CGAL


diff --git a/src/openscad.cc b/src/openscad.cc
index bf22246..180dbdf 100644
--- a/src/openscad.cc
+++ b/src/openscad.cc
@@ -318,6 +318,11 @@ int main(int argc, char **argv)
 			fclose(fp);
 		}
 
+		if (root_N->dim == 3 && !root_N->p3.is_simple()) {
+			fprintf(stderr, "Object isn't a valid 2-manifold! Modify your design.\n");
+			exit(1);
+		}
+
 		if (stl_output_file)
 			export_stl(root_N, stl_output_file, NULL);
 
-- 
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