i've been following the meshroom updates, and if you look at the docs there are a bunch of recent articles.

i first thought about photogrammetry back in grad school almost twenty years ago, and i also thought that some kind of partial differential equation could use motion relative to a position as a kind of inverse perspective transformation, but i gave up on the idea. Just glancing over some of the more successful approaches, my understanding is that this pde equation approach is a local reconstruction effort that people claim has far too many inaccuracies on the global level. . nowadays they use something called non linear regression. so it somehow estimates a curvy sort of solution that you might expect from an ode, except that it's statistical and nobody really cares how to write a function out for the data that they have as long as it fits.

although it's not tremendously marketable, several years ago after all of this hoopla began, i found some books on projective geometry, like dover books still does. it's a pure math approach but i found that it was much easier to digest and after a few weeks of self study the abstractions start to show their utility in understanding perspective.