Purple ground
I believe this is caused by a group of files called shaders. These files can be different for different graphics cards. If they somehow get the wrong shaders installed one of the results is the terrain in the foreground is purple. The shader package is based on your particular graphics card and is installed when you first install Oblivion. Any changes should only be made by people who are experienced with Graphics shaders. If you want more information on shaders, google it.
I have seen 3 possible fixes for this problem. The easiest is to go into your in game menu, (esc) select video and make sure your texture size is set to large.
The second involved the textures from unique landscapes. reinstalling them fixed it.
Purple ground
I believe this is caused by a group of files called shaders. These files can be different for different graphics cards. If they somehow get the wrong shaders installed one of the results is the terrain in the foreground is purple. The shader package is based on your particular graphics card and is installed when you first install Oblivion. Any changes should only be made by people who are experienced with Graphics shaders. If you want more information on shaders, google it.
I have seen 3 possible fixes for this problem. The easiest is to go into your in game menu, (esc) select video and make sure your texture size is set to large.
The second involved the textures from unique landscapes. reinstalling them fixed it.
The third involves loading patches in the wrong order and the only way to fix that one is to reinstall in the right order. Note that the oblivion uninstaller leaves behind your saves, mods (data) and oblivion.ini. These will still be there after you have reinstalled. So if You have a problem with a mod causing the problem or a bad save or a bad Oblivion.ini file The problem nay still be there.
My recommended uninstall and reinstall leaves you with a clean install. And your original mods and saves in a separate folder that you can put back into the new game. Or you can start over and install your mods again.
See this for my recommendation for uninstalling and reinstalling Oblivion.
http://s1.zetaboards.com/TheStormRavenLibrary/topic/344290/Please leave some feedback to let me know what works. Thanks
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http://s1.zetaboards.com/TheStormRavenLibrary/forum/236320/