I finally got to code a bit tonight ( https://github.com/stig-atle/io_scene_pbrt/tree/Pbrt-v4-support ) . I’m working on my exporter for blender - that exports the scene to the PBRT render engine file format ( https://github.com/mmp/pbrt-v4/ ).
It lets you create scenes in blender, then export them for rendering with PBRT renderer.

I’ve been working on adding support for the subsurface material type tonight.
Got this far - so not much left before I can push it.

@stigatle@twtxt.net That look cool 😎 – Way over my head though 😂