Show HN: An open source R package to add depth of field to images (tylermw.com)

This is impressive, and I hope you'll forgive my rather pedantic comment, but it seems to me you've got the terminology the wrong way around. What you've got here is a process for reducing depth of field, not adding it. In the rendered examples which are labeled on the left, "No depth of field", I'd call that: "Infinite depth of field".

Though of course looking at the pictures makes the intended meaning clear in any case.

Author here! This is part of a series where I describe the development of an R package I've been developing for mapping and visualization:

Show HN: A raytracer to shade, plot, and 3D print topographic maps in R, part 4 http://www.tylermw.com/3d-printing-rayshader/

Show HN: A raytracer to shade and visualize topographic maps in R, part 3 http://www.tylermw.com/3d-maps-with-rayshader/

Show HN: A raytracer to shade topographic maps in R, Part 2 http://www.tylermw.com/making-beautiful-maps/

Show HN: A raytracer to shade topographic maps in R http://tylermw.com/throwing-shade/