Technical blog posts about graphics programming, performance optimization, and scientific computinghttps://www.johnaparker.com/https://www.johnaparker.com/blog/claude-computational-physics-research/https://www.johnaparker.com/blog/claude-computational-physics-research/An autonomous research agent equipped with computational physics tools and a research goal makes real headwaySun, 05 Apr 2026 00:00:00 GMThttps://www.johnaparker.com/blog/converting-fortran-miepy-tmatrix/https://www.johnaparker.com/blog/converting-fortran-miepy-tmatrix/Using Claude Code agent teams to port an electrodynamic T-matrix solver from 12,000 lines of Fortran code to 3,000 lines of modern C++Tue, 17 Mar 2026 00:00:00 GMThttps://www.johnaparker.com/blog/gpu-accelerating-miepy/https://www.johnaparker.com/blog/gpu-accelerating-miepy/Claude Code with Opus 4.6 wrote a JAX-based GPU backend for a complex multiparticle boundary-condition electrodynamics solver, achieving up to 12X speedupSun, 01 Mar 2026 00:00:00 GMThttps://www.johnaparker.com/blog/creating-loom/https://www.johnaparker.com/blog/creating-loom/How I built a 16k-line Rust TUI in one week without writing or reading any code, using Claude Code and parallel agents to manage Git worktreesThu, 29 Jan 2026 00:00:00 GMThttps://www.johnaparker.com/blog/2021-1-14-optix-tutorial/https://www.johnaparker.com/blog/2021-1-14-optix-tutorial/A ray tracing tutorial series for OptiX 7 starting from the basics and covering advanced topics from materials and real-time animationThu, 14 Jan 2021 00:00:00 GMThttps://www.johnaparker.com/blog/2020-11-7-circle-graphics/https://www.johnaparker.com/blog/2020-11-7-circle-graphics/When using Matplotlib, animations of a large number of circles become slow. Using OpenGL, over a million circles can be animated in realtimeSat, 07 Nov 2020 00:00:00 GMThttps://www.johnaparker.com/blog/2020-10-14-fft_2d_performance/https://www.johnaparker.com/blog/2020-10-14-fft_2d_performance/Compare the performance of different FFT implementations using PythonWed, 14 Oct 2020 00:00:00 GMThttps://www.johnaparker.com/blog/2020-09-25-delaunay-overlap/https://www.johnaparker.com/blog/2020-09-25-delaunay-overlap/Given two or more Delaunay tessellations, you may be interested in measuring how much they overlap with one anotherFri, 25 Sep 2020 00:00:00 GMT