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Id Tech 7's main selling point has been that it has "10 times the geometric detail" of the predecessor.

Does this actually mean something, or is it marketing garbage?

I don't know about 3d engines, but arbitrarily increasing the number of polygons is something any engine can do; if they refer to speed instead, I'm very skeptical that it can render 10 times as much polygons in the same amount of time.

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Some reasonable explanations are:

  • Better multithreading for pushing more geometry from CPU to GPU
  • New GPU triangle-, light- and occlusion-culling system to not render what isn't on-screen
  • Improved LOD system

Source: gamedev.net

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