Here's an overview of how the code is arranged:

Library (LGPLv3):
=================

API:                   libdimension/dimension.h, libdimension/dimension/*.h
                       (Implementations for libdimension/dimension/$file.h
                       are generally at libdimension/$file.c)
Ray tracing algorithm: libdimension/raytrace.c
Bounding hierarchy:    libdimension/prtree.{c,h}
Library internals:     libdimension/dimension-impl.h and its #includes
Tests:                 libdimension/tests/*.{c,cpp}
Benchmarks:            libdimension/bench/*.c