From d724385dd003f871c0b1218392387e6ab87db28f Mon Sep 17 00:00:00 2001
From: clifford <clifford@b57f626f-c46c-0410-a088-ec61d464b74c>
Date: Wed, 13 Jan 2010 10:48:30 +0000
Subject: Clifford Wolf: 	Do not crash on bogus polygon() calls

git-svn-id: http://svn.clifford.at/openscad/trunk@273 b57f626f-c46c-0410-a088-ec61d464b74c

diff --git a/TODO.txt b/TODO.txt
index bfcf775..8f4dbc4 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -5,7 +5,6 @@ o Some invalid DXF data gets pass the import checks and breaks the tessing code
 o Broken polyhedron() entities are not correctly detected and cause CGAL segfaults
 o Tesselation via GLU sometimes produces strange results
 o Non-manifold objects make CGAL crash (e.g. two cubes which touch at one edge)
-o crash: polygon(paths=[[0,0],[10,0],[0,10]])
 o crash: rotate([0,1,0])import_dxf("../openscad-tess/testdata/polygon.dxf");
 
 USER INTERFACE
diff --git a/primitives.cc b/primitives.cc
index 7e6a9e1..95bd3b8 100644
--- a/primitives.cc
+++ b/primitives.cc
@@ -481,11 +481,17 @@ sphere_next_r2:
 				dd.paths.append(DxfData::Path());
 				for (int j=0; j<paths.vec[i]->vec.size(); j++) {
 					int idx = paths.vec[i]->vec[j]->num;
-					DxfData::Point *p = &dd.points[idx];
-					dd.paths.last().points.append(p);
+					if (idx < dd.points.size()) {
+						DxfData::Point *p = &dd.points[idx];
+						dd.paths.last().points.append(p);
+					}
+				}
+				if (dd.paths.last().points.isEmpty()) {
+					dd.paths.removeLast();
+				} else {
+					dd.paths.last().points.append(dd.paths.last().points.first());
+					dd.paths.last().is_closed = true;
 				}
-				dd.paths.last().points.append(dd.paths.last().points.first());
-				dd.paths.last().is_closed = true;
 			}
 		}
 
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