Ray - Path Tracable Models - Downloadable 3D Models
Download as gltf and raytrace.
Many are Real Time Oriented, means opacity masks, need to do consistent normal interpolation, normal maps instead of tessellated, triangulated with some bad triangle (looooong thin triangles), etc.
Interesting because they are PBR, with with interesting scene setup/feature, transparency "stack", shading (realistic, toon or other styles), scan based mesh, bad triangulation (long thing triangle, mix of gigantic triangles and very small ones, emissive materials, sss, even some models with points/lines, etc). In brief, all the joys of UGC, with an Real time Oriented flavor :)
Please do not forget to credits all author!