In the course of preparing lessons on projective geometry I want to give an account on the historical development. It is easy to obtain an overview of the history starting with G. Desargues. And with respect to older sources http://en.wikipedia.org/wiki/Projective_geometry is of great help. But what I am not sure about is the question, whether Desargues was more an Euclid or an Eudoxos. Was he more collecting and reproducing the knowledge of scholars and artists like Filippo Brunelleschi, Ambrogio Lorenzetti, Pietro Perugino? Or did he invent himself most of what he wrote about? And what were his relations to his contemporary Johannes Kepler who worked in the same field?
I guess you'll find what you need in the monograph by J.V. Field and J.J. Gray, The Geometrical Work of Girard Desargues.
Desargues had a limited range of interactions, which apparently did not include Kepler. Quoting from Gale's Science and Its Times:
One piece of trivia, on the origin of the concept of involution caught my attention:
Desargues certainly pioneered original mathematics. The notion of a point at infinity in projective geometry is usually attributed to him. Kepler apparently did not work in projective geometry but rather in astronomy and pioneered a number of mathematical techniques such as infinitesimals. I am not aware of any interactions between Desargues and Kepler, but Desargues did play an interesting role of attempting to resolve a dispute between his junior colleagues Fermat and Descartes.
I now see that wiki attributes the notion of the point at infinity to Kepler, citing Coxeter. This seems like a novelty to me. Kepler did talk about points at infinity, but not in the context of projective geometry as we understand it, but rather as a way of developing a unified technique for treating conic sections through a kind of a continuity principle. This is closer to calculus than projective geometry.