disable clip planes after use (Doesn't seem to make a difference,

and is only a temporary measure, as it was planned to OSGify the
HUD and put it in the scenegraph etc.)

src/Instrumentation/HUD/HUD.cxx

@@ -293,6 +293,8 @@ void HUD::common_draw()
         if ((*it)->isEnabled())
             (*it)->draw();
 
+    _clip_box->unset();
+
     if (isAntialiased()) {
         glDisable(GL_ALPHA_TEST);
         glDisable(GL_LINE_SMOOTH);
@@ -636,3 +638,13 @@ void ClipBox::set()
     glEnable(GL_CLIP_PLANE3);
 }
 
+
+void ClipBox::unset()
+{
+    if (_active) {
+        glDisable(GL_CLIP_PLANE0);
+        glDisable(GL_CLIP_PLANE1);
+        glDisable(GL_CLIP_PLANE2);
+        glDisable(GL_CLIP_PLANE3);
+    }
+}

src/Instrumentation/HUD/HUD.hxx

@@ -58,6 +58,7 @@ class ClipBox {
 public:
     ClipBox(const SGPropertyNode *, float xoffset = 0, float yoffset = 0);
     void set();
+    void unset();
 
 private:
     bool _active;

src/Instrumentation/HUD/HUD_ladder.cxx

@@ -559,9 +559,7 @@ void HUD::Ladder::draw(void)
         _locStippleLineList.draw();
         glDisable(GL_LINE_STIPPLE);
     }
-    glDisable(GL_CLIP_PLANE0);
+    _clip_box->set();
-    glDisable(GL_CLIP_PLANE1);
-    glDisable(GL_CLIP_PLANE2);
     glPopMatrix();
     //*************************************************************