From 2f4582eeba31dae4ec07133e348c4938e106a930 Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Fri, 2 Sep 2011 20:18:27 +0200
Subject: bugfix: Don't try to render empty polyhedrons


diff --git a/src/mainwin.cc b/src/mainwin.cc
index 4faed34..a2c845d 100644
--- a/src/mainwin.cc
+++ b/src/mainwin.cc
@@ -1275,16 +1275,21 @@ void MainWindow::actionRenderCGAL()
 		int s = t.elapsed() / 1000;
 		PRINTF("Total rendering time: %d hours, %d minutes, %d seconds", s / (60*60), (s / 60) % 60, s % 60);
 
-		this->cgalRenderer = new CGALRenderer(*this->root_N);
-		// Go to CGAL view mode
-		if (viewActionCGALGrid->isChecked()) {
-			viewModeCGALGrid();
+		if (!this->root_N->empty()) {
+			this->cgalRenderer = new CGALRenderer(*this->root_N);
+			// Go to CGAL view mode
+			if (viewActionCGALGrid->isChecked()) {
+				viewModeCGALGrid();
+			}
+			else {
+				viewModeCGALSurface();
+			}
+			
+			PRINT("Rendering finished.");
 		}
 		else {
-			viewModeCGALSurface();
+			PRINT("WARNING: No top level geometry to render");
 		}
-
-		PRINT("Rendering finished.");
 	}
 
 #ifdef USE_PROGRESSWIDGET
-- 
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