this post was submitted on 07 Sep 2023
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Right I think I got confused. The megatexture is a huuuuge single texture covering the entire map geometry. It has a ridiculous size (at the time of Rage, it was 32,000 by 32,000). It also holds data for which bits should be treated as what type of terrain for footprints etc.
The problem with this approach is it eats a shit ton of RAM, which the 7th gen consoles didn't have much of. Thus the only high quality textured that were loaded in were the ones the player could see, and loaded out when the player couldn't.
Megatextures are used in all IdTech games since, but because they weren't open world and/or targeted 8th gen consoles and later, with much more RAM, unloading the textures isn't necessary.
Whatever code they used to "unload" the texture was also kept for PC, because the same thing happened there. This would have been on an ATI 5870 that I played that. At least double the VRAM of any console at the time.
Man, remember when flagship GPUs were £300? Wtf happened to those days...
Heh. Good times.
Such a shame poor PC optimisation was what we kept instead of affordable cards.