Hi,
first - you are wrong
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NWN use only OpenGL - and can not be set to DirectX (i dont know any serious game who can switch between OpenGL<>DirectX - the optimizing process for one system is work enough ..)
Second - OpenGL on windows systems come with the GFX-Card drivers.
It is not possible to install it "over" this drivers.
Nearly all Cards that in use today, have OpenGL drivers ...
The problems come from NWN - it uses at time it was relased non standard fancy OpenGL "haks" to get nice GFX with low performance inpact.
Like the "shiny water" effect that iss totaly an hak and only work on cards that support this hak.
Its show , with the developing of GFX drivers - more and more "compatibility mode fall backs" in the drivers get gone (like: if NWNmain the exe that call the opengl driver, activate this and this ..)
So you can blame BioWare to use non conform OpenGL usage, to get for his time nice effects by acceptable speed - or blame the GFX-Card developers to not maintain 10+ years old compatibility modes for old non conform games .....
Anyway - i have managed to get the game running on my Main Lenovo workstation ( i use serious 3D GFX with Maya on an 12 core Xeon CPU with an AMD FirePro card that USE FULL OpenGL at proffesionell level ..)
I can only get infos for ATI/AMD cards ...
First - disable shiny water - no way it work on nearly all cards today...(on my old ATI Radeon9800Pro it have running well
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Second - Test with Catalyst AI - Enhanced never worked for me , try Basic ... with this it runs on my old ATI 4850.
Give it GFX errors or invisible characters - disable EnvironmentMapping in advanced GFX settings in NWN (the same place who you disable shiny water) and disable catalyst AI complete.
(this is my actual setting on my FirePro 8700 Card)
Third - NWN dont like the "new" edge-dedect antialiasing in newer ATI/AMD drivers ....
It will be very slow on this setting.I use ATITrayTools and have switched to the next lower AA mode (wide-tent) and it is running blazing fast ...
So i can run an very fast NWN on 1920x1200 (pro 24zoll EIZO LCD-TFT) , but miss shinywater (was nice) and now environmentmapping on creatures too .... (was nice too ..)
But i can play it.
Regards
R-TEAM