Support motion-tracking in pick callbacks.

diff --git a/simgear/scene/util/SGPickCallback.hxx b/simgear/scene/util/SGPickCallback.hxx
index 23bc747d9baa207b1453f40f1a4e8e97b91161e7..5dac95245386c6cb629b49b8b4ace6f4179f70e3 100644 (file)
--- a/simgear/scene/util/SGPickCallback.hxx
+++ b/simgear/scene/util/SGPickCallback.hxx
@@ -58,6 +58,9 @@ public:
   virtual void buttonReleased(void)
   { }
 
+  virtual void mouseMoved(const osgGA::GUIEventAdapter* event)
+  { }
+
   virtual bool hover(const osg::Vec2d& windowPos, const Info& info)
   {  return false; }