The Official DOOM 3 [H]ardware Guide
Bem, nesse link tem um guia (bem grande) de hardware pro Doom 3. O guia é bem completo, e mostra as diferenças entre Low, Medium e High Quality. Vale uma olhada. Ainda não li tudo.
Uma passagem do guia:
"The very first image quality difference that struck us was the clear advantage of having 8X anisotropic filtering enabled in High Quality. The floor shows this advantage the best. Looking at the image, it's surprising just how good Low Quality looks. id Software has done an incredible job at making even the lowest quality setting look so good. In the second screenshot above, we cut out a portion of the first screenshot where we noticed the most obvious difference in texture quality between these three settings. In the third screenshot above, we can really see what a great job id Software has done. The textures look absolutely incredible in Low Quality. The most obvious difference we see here is in the addition of 8X anisotropic filtering in High Quality and the more defined shadow lines on the tube coming down from the ceiling in Medium versus Low Quality. The fourth screenshot comparison shows us the additional detail being added by the move to Medium Quality. With 8X anisotropic filtering enabled at High Quality, much more detail is visible on the floor. In the very last screenshot comparison you can see that the light emanating from the flashlight looks similar throughout all quality settings and that the monster looks absolutely incredible even in the Low Quality shot, with slightly more detail being seen at High Quality."
Algumas fotos dessa comparação:
Eu achei as diferenças mínimas, e nessa última foto, da pra ver bem que no geral, a qualidade ta bem parecida, apenas detalhes pequenos, como o texto la no fundo de uma tela azul, e detalhes menores estão mais "apagados", coisa que na correria do jogo, ngm percebe (a não ser claro os mais nerds e chatos de olhos biônicos né :rolleyes).
Ainda tem o Ultra quality, mas esse acho q é pros que possuem um equipamento melhorzinho.
Ok, uma fotinho comparando High Quality vs Ultra Quality, e o texto comentando sobre essas fotos:
"The screenshot comparison we notice the most difference in here is in the fifth set above. It appears that the uncompressed specular light map is adding more detail to the monster's belly, since the texture itself is already uncompressed between High and Ultra Quality settings. The difference however is so slight that when you are playing the game at its normally fast paced speed you are unlikely to see any difference. This is actually great news, as when you are running at the High Quality setting you know you are very near to the best visual gaming experience DOOM 3 has to offer."