File: src/ext/tinyobj/tiny_obj_loader.h
Copyright: 2012-2019 Syoyo Fujita
URL: https://github.com/syoyo/tinyobjloader/

Files: src/ext/miniply/miniply.h src/ext/miniply/miniply.cpp
Copyright: 2019 Vilya Harvey
URL: https://github.com/vilya/miniply/

Files: src/ext/nanovdb/nanovdb/*
Copyright: Contributors to the OpenVDB Project, OpenVDB v12.1.1.
URL: https://github.com/AcademySoftwareFoundation/openvdb/tree/v12.1.1

File: src/volumes/cie.h
Copyright: 1998-2020 Matt Pharr, Wenzel Jakob, and Greg Humphreys.
URL: https://github.com/mmp/pbrt-v4