the best part of it all is the quality of work to make it all appear as if you are looking at the actual active game world, where doing so in the actual game would come with LoD and culling
https://www.models-resource.com/ also has some 3d files of levels, but few and far between. Another great resource is the Boundary Break YouTube channel. I used those in several of my level design classes.
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A wireframe mode would be so useful
Exactly the kind of nerdy stuff I love 😊