It's a silly toy ray tracer, sorta based off of the Ray Tracing in One Weekend Series.

skyes-silly-rt [scene] [output]

[scene] may be a path to a kdl scene description document or one of the two built-in scenes, builtin:CornellBox and builtin:TeapotLand. [output] is the output path, the file extension must be .png.

see scene.kdl for an example scene. the built-in scenes need the STL files in repository root to be in working directory. custom scenes will also load STL files relative to program working directory, not the scene file!e!