So this is not for dummies, I guess. It was also too good to be true.
I really would have liked to explore how they go about it.
My download has also stopped halfway through. I'm going to try again during the night if there is still any point to it. In any case, I'm glad that it might be of use to you, ajcgi.
.json files mean nothing to me, I even had to look up what they are. If I understand it correctly, the download should also include .obj files.
Geometry and texture format
All geometry is represented in the Wavefront OBJ file format, which was chosen for its
widespread use. All surfaces are Catmull-Clark subdivision surfaces, so each OBJ file contains
a quad-mesh representing the control cage for the subdivision surface. We do not use any
creases. We generally interact with subdivided meshes at a level that is representative of the
authored shape, and, at render time, subdivide further.
island/json -
This directory contains json files that include all the data needed to define the
lights, cameras and elements in the scene. Each element has its own subdirectory that includes
both a main file with all instances and transforms and a separate file with the materials
associated with that element. The json-based material files include the full brdf definition as well
as the original bindings.
island/obj -
This directory contains the object files which define the geometry for each element.
For each element there is a subdirectory which contains a standard .obj file for the object, a
corresponding material binding .mtl file, and a json-based .hier file. More information on the
usage of these files can be found below under "Details and caveats".