我的天呀, DOOM 3 已支援 512MB RAM 的顯示卡...

我的天呀, DOOM 3 已支援 512MB RAM 的顯示卡, 我的 Main  memory 才 512MB 呢, 看來我只有玩 Medium Quality 的質數了.

id software 的 Robert Duffy 在他的 Webdog 當中對 Doom3 畫質設置給出了官方解釋：

In Ultra quality, we load each texture; diffuse, specular, normal map at full resolution with no compression. In a typical DOOM 3 level, this can hover around a whopping 500MB of texture data. This will run on current hardware but obviously we cannot fit 500MB of texture data onto a 256MB card and the amount of texture data referenced in a give scene per frame ( 60 times a second ) can easily be 50MB+. This can cause some choppiness as a lot of memory bandwidth is being consumed. It does however look fantastic :-) and it is certainly playable on high end systems but due to the hitching that can occur we chose to require a 512MB Video card before setting this automatically
在 Ultra Quality 設置下，所有貼圖，包含 Diffuse、Specular 和 Normal Map 都是原本解像度，沒有經過任何壓縮，在一個 Doom3 關卡當中，這些未壓縮貼圖尺寸高達 500MB，所以不適合 256MB 的顯示卡.

High quality uses compression ( DXT1,3,5 ) for specular and diffuse and no compression for normal maps. This looks very very close to Ultra quality but the compression does cause some loss. This is the quality that for instance the PC Gamer review was played in.
High Quality 設置情況下，採用 DXT1,3,5 對 Specular 和 Diffuse 貼圖壓縮，但是對 Normal Map 沒有壓縮，High Quality 設置畫質和 Ultra Quality 非常接近，但是壓縮帶來一些畫質損失，High Quality 設置也是 PC GAMER 雜誌在測評當中採用的畫質設置.

Medium quality uses compression for specular, diffuse, and normal maps. This still looks really really good but compressing the normal maps can produce a few artifacts especially on hard angled or round edges. This level gets us comfortably onto 128MB video cards.
Medium Quality 設置下，壓縮 Specular、Diffuse 和 Normal Map，Medium Quality 的畫質仍然非常好，但是對 Normal Map 的壓縮導致在轉角圓弧拐彎處的畫面有少許失真, 這種設置適合於128MB 的顯示卡.

Low quality does everything medium quality does but it also downsizes textures over 512x512 and we downsize specular maps to 64x64 in this mode as well. This fits us onto a 64MB video card.
在 Low Quality 設置下，所有的設置都和 Medium Quality 相同，不過將 512x512 貼圖降低尺寸，將 Specular 貼圖尺寸降低到 64x64，這種設置適合於 64MB 的顯示卡。

the game is capped at 60fps for normal game play. For render demos, like what was used for the HARD OCP stuff, we run those at full tilt which is why you will see > 60fps.
Doom3 正式版將把 fps 上限限制在 60fps ，不過在諸如 Hardocp 等網站測試的 Render Demo 當中，沒有 fps 上限設置，這也是測試成績突破 60fps 的原因。