Infinigen is a procedural 3D scene generator developed by Princeton Vision & Learning Lab. It can be used to create 3D scenes and 3D worlds based solely on mathematical formulas. This type of procedural generation is strongly reminiscent of shader programming for graphics cards, which has been practiced in the game and demo scene for decades.
Even though the huggingface.co/papers/2306.09310 (project paper "Infinite Photorealistic Worlds using Procedural Generation" has been up on Hugging Face since last week, Infinigen promises, "Math rules only. Zero AI. Just Graphics."
So here there is no inscrutable latent space at the center of image generation, but really pure mathematics, where every parameter can be changed directly. As a result, almost any number of variations of a world can be generated via 
the seed.
Infinigen - Free procedural world generator based on Blender
Infinigen is based on Blender and is free and open source (BSD 3-Clause License). Instead of "codec" a landscape, it can be assembled in Blender using a node based computegraph (which doesn't necessarily end up clearer ;)
If you look at the results in the demo video, you can see that "Photorealistic Worlds" is nevertheless relative. Depending on the render settings, the digital origin often remains clearly visible. However, what in the future perhaps an AI could again nicely calculate with "more realism".
;)