This a DX effects, volumetric fog achieve. There are exe files can be run directly see the effect.

体积雾
......\01_VolumeFog
......\............\Common
......\............\......\DXUT.cpp
......\............\......\DXUT.h
......\............\......\DXUTMesh.cpp
......\............\......\DXUTMesh.h
......\............\......\DXUTRes.cpp
......\............\......\DXUTRes.h
......\............\......\DXUTSettingsDlg.cpp
......\............\......\DXUTSettingsDlg.h
......\............\......\DXUT_2003.sln
......\............\......\DXUT_2003.vcproj
......\............\......\DXUT_2005.sln
......\............\......\DXUT_2005.vcproj
......\............\......\DXUTenum.cpp
......\............\......\DXUTenum.h
......\............\......\DXUTgui.cpp
......\............\......\DXUTgui.h
......\............\......\DXUTmisc.cpp
......\............\......\DXUTmisc.h
......\............\......\DXUTsound.cpp
......\............\......\DXUTsound.h
......\............\......\directx.ico
......\............\......\dxstdafx.cpp
......\............\......\dxstdafx.h
......\............\VolumeFog.cpp
......\............\VolumeFog.exe
......\............\VolumeFog.jpg
......\............\VolumeFog.manifest
......\............\VolumeFog.rc
......\............\VolumeFog_2003.sln
......\............\VolumeFog_2003.suo
......\............\VolumeFog_2003.vcproj
......\............\VolumeFog_2005.sln
......\............\VolumeFog_2005.vcproj
......\............\fog2.x
......\............\fogpixshader.psh
......\............\fogshader1.vsh
......\............\fogshader2.vsh
......\............\resource.h
......\............\room2.x

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