Use a gray background for contrast in the model viewer.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4149 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/jme/tools/ModelViewer.java

@@ -80,6 +80,7 @@ import com.jme.scene.state.MaterialState;
 import com.jme.scene.state.TextureState;
 import com.jme.scene.state.WireframeState;
 import com.jme.scene.state.ZBufferState;
+import com.jme.system.JmeException;
 import com.jme.util.LoggingSystem;
 import com.jme.util.TextureManager;
 import com.jme.util.geom.Debugger;
@@ -277,6 +278,14 @@ public class ModelViewer extends JmeCanvasApp
         return true;
     }
     
+    @Override // documentation inherited
+    protected void initDisplay ()
+        throws JmeException
+    {
+        super.initDisplay();
+        _ctx.getRenderer().setBackgroundColor(ColorRGBA.gray);
+    }
+    
     @Override // documentation inherited
     protected void initInput ()
     {