From 27983e001b574eb5087a7d4cc6d33871891a9478 Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Tue, 27 Dec 2011 03:44:48 +0100
Subject: bugfix: Fix assertion fail trying to export a non-2D file to dxf


diff --git a/src/openscad.cc b/src/openscad.cc
index 0d5b25e..c6dd7b6 100644
--- a/src/openscad.cc
+++ b/src/openscad.cc
@@ -364,6 +364,10 @@ int main(int argc, char **argv)
 			}
 			
 			if (dxf_output_file) {
+				if (root_N.dim != 2) {
+					fprintf(stderr, "Current top level object is not a 2D object.\n");
+					exit(1);
+				}
 				std::ofstream fstream(dxf_output_file);
 				if (!fstream.is_open()) {
 					PRINTF("Can't open file \"%s\" for export", dxf_output_file);
-- 
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