Hi,

    It is actually a osgEarth problem.but I have lost track of it in osgEarth 
forum,and someone there said it is something about 
GraphicsWindowQT and osg 3.1.3,so I think I may get help here.

   By osg 3.2.0 ,osgEarth 2.5, qt 4 ,win 7,I can zoom in and out earth with two 
fingers when  running  osgEarth_viewer or osgEarth_manip example,but when 
ingreated osgEarth to qt,like the osgEarth_qt_package example,the zoom funcion 
fails.

   In osgEarth forum ,Mr jasonbeverageReply said :

" If you're using QT I think you need some patches to the GraphicsWindowQT to 
get it to work.
   I've attached a patch GraphicsWindowQt.  It's been modified against osg 
3.1.3 and not the trunk osg so I haven't submitted it to Robert yet.  You 
should be able to see what I did to patch it and apply it locally."

    then I lost the track,what should I do?  ThX!






 how to zoom in and out with two fingers when using a Multi-touch screen


Thank you!

Cheers,
Lv

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=58503#58503





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