利用opengl三维显示地理场景 3D DEM

代码说明：

3D_DEM 利用opengl三维显示地理场景

文件列表：

3D_DEM\scbarg.h
3D_DEM\moon.bmp
3D_DEM\earth.bmp
3D_DEM\DEM.cpp
3D_DEM\Resource.h
3D_DEM\DEM.clw
3D_DEM\ReadMe.txt
3D_DEM\DEMEdit.h
3D_DEM\DEM.h
3D_DEM\scbarg.cpp
3D_DEM\StdAfx.cpp
3D_DEM\DEMEdit.cpp
3D_DEM\ChildFrm.h
3D_DEM\ChildFrm.cpp
3D_DEM\DEM.dsp
3D_DEM\DEMDoc.h
3D_DEM\StdAfx.h
3D_DEM\DEMDoc.cpp
3D_DEM\PointAttrib.cpp
3D_DEM\MapPickAttrib.cpp
3D_DEM\DEM.dsw
3D_DEM\DEM.ncb
3D_DEM\ComboToolBar.h
3D_DEM\GLEnabledView.h
3D_DEM\ViewPort.cpp
3D_DEM\ColorButton.h
3D_DEM\ComboToolBar.cpp
3D_DEM\ColorButton.cpp
3D_DEM\DEMdata.h
3D_DEM\PointAttrib.h
3D_DEM\MapViewAttrib.cpp
3D_DEM\DEMView.h
3D_DEM\OpenGLText.cpp
3D_DEM\DEM.plg
3D_DEM\PointAttribData.cpp
3D_DEM\ViewPort.h
3D_DEM\MapViewAttrib.h
3D_DEM\OpenGLText.h
3D_DEM\PointAttribData.h
3D_DEM\CoolTabCtrl.cpp
3D_DEM\sizecbar.cpp
3D_DEM\sizecbar.h
3D_DEM\CoolTabCtrl.h
3D_DEM\res\DEM.rc2
3D_DEM\res\DEMDoc.ico
3D_DEM\res\DEM.ico
3D_DEM\res\Thumbs.db
3D_DEM\res\arrow_r.cur
3D_DEM\res\harrow.cur
3D_DEM\res\hmove.cur
3D_DEM\res\cursor1.cur
3D_DEM\res\zoomin1.cur
3D_DEM\res\scaletoo.bmp
3D_DEM\res\toolbar1.bmp
3D_DEM\res\bmp00001.bmp
3D_DEM\res\showtool.bmp
3D_DEM\res\earth.bmp
3D_DEM\res\mainfram.bmp
3D_DEM\res\Toolbar.bmp
3D_DEM\FullScreenHandler.cpp
3D_DEM\FullScreenHandler.h
3D_DEM\MainFrm.cpp
3D_DEM\MainFrm.h
3D_DEM\DEM.rc
3D_DEM\DEM.APS
3D_DEM\DEMdata.cpp
3D_DEM\DEMView.cpp
3D_DEM\GLEnabledView.cpp
3D_DEM\DEM.opt
3D_DEM\Debug
3D_DEM\res
3D_DEM\Release
3D_DEM