Textures are still going to be the daddy of disk space. I don't think you're factoring in compression, which is essential for any modern game. Geometry typically benefits from much higher compression, while good 4k textures just don't get small.However all those triangles are going to require a lot of storage and that 1TB SDD on those consoles won't go very far. For reference i have a 3.7 million triangle, sculpted 3D model of a basic bunker (similar to the starcraft 2 terran bunker) and the geometry alone is 1GB. Imagine an entire linear level pushing well over a billion polygons.
Forgot to say, the bit I'm really excited about with Nanite isn't the increased detail, but the removal of pop-in. The LOD method is so antiquated and really damages immersion, I'm glad it's being phased out.
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