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Benchmarking
1) Load Doom3 using the shortcut that enables the console
2) Open the console using the ~ key below ESC or press CTRL ALT ~
3) Enter the command timedemo demo1
4) Wait until demo has finished and note your FPS
5) Adjust your settings/tweaks and repeat steps 2 to 4 until you find the settings with the best average FPS.
Repeat steps 2-5 with the other Doom 3 benchmark
benchmark
To test your FPS while online type "com_showfps 1" at the console
Please make sure that you read the Display and Rendering Tweak Notes at the foot of this page. The lowest system specification I have here is a 1.8 GHZ AMD Athlon XP, Geforce4 ti4200/128/8x with 512 megabytes of system ram. Tweaks are based on best compromise / quality in the single player game for that system.
Make sure that you do a writeconfig DoomConfig.cfg followed by a vid_restart after setting the cvars.
Main Menu Options
Ultra
Each texture (diffuse, specular, normal) will be at full resolution with no compression. In a typical DOOM 3 level, this can hover around 500 megabyte of texture data. This will run on current hardware but will not fit onto a 256MB card, causing texture thrashing. The amount of texture referenced in a given scene per frame ( 60 times a second ) can easily be 50 megabytes+. This is ideal for 512 megabyte video cards.
High quality
Uses hardware compression ( DXT1,3,5 ) for specular and diffuse textures and no compression for normal textures. This looks very very close to Ultra quality but the compression does cause some loss in quality. This is ideal for 256 megabyte video cards.
Medium quality
Uses hardware compression for all textures (specular, diffuse and normal). While this still looks good, compressing the normal maps can produce a few artifacts especially on hard angled or round edges. This is ideal for 128 megabyte cards.
Low quality
Uses hardware compression for all textures (specular, diffuse and normal) and automatically resizes diffuse and normal textures to no more than 256x256 and specular texture maps to no more than 64x64. This is ideal for 64 megabyte video cards.
Best Visual / FPS Compromise Config
Create a file called autoexec.cfg in your Doom3 'Base' directory and add the relevant config
64 Megabyte Video Cards
seta image_downSizeLimit "256"
seta image_ignoreHighQuality "1"
seta image_downSizeBumpLimit "256"
seta image_downSizeSpecularLimit "64"
seta image_downSizeBump "1"
seta image_downSizeSpecular "1"
seta image_downSize "1"
seta image_forceDownSize "1"
seta image_anisotropy "0"
seta image_filter "GL_LINEAR_MIPMAP_NEAREST"
128 Megabyte Video Cards
seta image_downSizeLimit "512"
seta image_ignoreHighQuality "1"
seta image_downSizeBumpLimit "512"
seta image_downSizeSpecularLimit "64"
seta image_downSizeBump "1"
seta image_downSizeSpecular "1"
seta image_downSize "1"
seta image_forceDownSize "1"
seta image_anisotropy "0"
seta image_filter "GL_LINEAR_MIPMAP_NEAREST"
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