From 27f8370c7b870eae97189161a1d7c4907f82c6ba Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Mon, 5 Jan 2015 21:41:05 -0500
Subject: [PATCH] Export blank image on empty top-level objects, instead of no
 image

---
 src/openscad.cc | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/openscad.cc b/src/openscad.cc
index 1e8f56c1..ab7e3acf 100644
--- a/src/openscad.cc
+++ b/src/openscad.cc
@@ -457,10 +457,7 @@ int cmdline(const char *deps_output_file, const std::string &filename, Camera &c
 			// echo or OpenCSG png -> don't necessarily need geometry evaluation
 		} else {
 			root_geom = geomevaluator.evaluateGeometry(*tree.root(), true);
-			if (!root_geom) {
-				PRINT("No top-level object found.");
-				return 1;
-			}
+			if (!root_geom) root_geom.reset(new CGAL_Nef_polyhedron());
 			if (renderer == Render::CGAL && root_geom->getDimension() == 3) {
 				const CGAL_Nef_polyhedron *N = dynamic_cast<const CGAL_Nef_polyhedron*>(root_geom.get());
 				if (!N) {