create static functions to set/get hidden node mask; compromise on magic numbers to make things easier to understand

apps/opencs/view/render/mask.hpp

@@ -10,9 +10,6 @@ namespace CSVRender
     /// @copydoc MWRender::VisMask
     enum Mask
     {
-        // internal use within NifLoader, do not change
-        Mask_UpdateVisitor = 0x1,
-
         // elements that are part of the actual scene
         Mask_Reference = 0x2,
         Mask_Pathgrid = 0x4,

apps/opencs/view/render/scenewidget.cpp

@@ -88,8 +88,6 @@ RenderWidget::RenderWidget(QWidget *parent, Qt::WindowFlags f)
     // Add ability to signal osg to show its statistics for debugging purposes
     mView->addEventHandler(new osgViewer::StatsHandler);
 
-    mView->getCamera()->setCullMask(~(Mask_UpdateVisitor));
-
     viewer.addView(mView);
     viewer.setDone(false);
     viewer.realize();