The slides from my talks at the Better Software Conference are now available here: terathon.com/lengyel/#spe...
Eric Lengyel
@ericlengyel.bsky.social
• Creator of Radical Pie equation editor, Slug Library, C4 Engine • Math / gamedev author • Geometric algebra researcher • Former Naughty Dog, Apple, Sierra
I just returned home from an amazing week at the Better Software Conference in Sweden. So many great people there, and very impressive content.
I'm giving two talks at the Better Software Conference in Sweden next week: 1) Software Design in the Radical Pie Equation Editor 2) Math and Container Libraries in the C4 Game Engine Architecture I believe videos will be available, and I will post slides.
Do you use the equation editor built into Microsoft Word? If so, you can put an end to your suffering by upgrading to Radical Pie. radicalpie.com
Version 1.12 of the Radical Pie equation editor has been released. This version contains some major new chemistry features that were used to construct the diagrams below. This is once again a free upgrade.
On the topic of Adobe, I recently reported a bug in Illustrator that appeared in the latest update (version 30.5.1). I got a surprisingly fast response and acknowledgement that they were able to reproduce it. Microsoft should take notes.
Adobe is now a double-licensee of the Slug Library, having just licensed it for a second software product. Nothing says a customer is happy more than repeat business!
I'm going to be speaking at the Better Software Conference in Sweden next month. Details to come. bettersoftwareconference.com
I have posted the slides from my talk at the Virginia Tech geometry seminar last week: terathon.com/pga_relativi...
I’m at Virginia Tech again this week to speak in the math career connections series. I’ll be telling students all about what I’ve been doing with my VT math degrees over the past 30 years.
I posted an unusual entry in my blog that reminisces about my first professional software engineering job before I entered the games industry in the mid-90s. Bespoke Software for Oscillating Bob Viscometry terathon.com/blog/viscome...
Several non-Windows users have now told me that they bought a Windows machine just so they could run Radical Pie. Pretty cool! radicalpie.com
NASA has a live stream of the Artemis II mission that will run for the entire duration: www.youtube.com/watch?v=m3kR...
NASA's Artemis II Live Mission Coverage (Official Broadcast)
YouTube video by NASA
youtube.com
Radical Pie 1.8 was released today, and it includes the ability to parse LaTeX. If you have a big equation already written in LaTeX, then you can just copy/paste the plain text into the editor, and Radical Pie will lay it out visually. radicalpie.com
Currently working on fur rendering for Chapter 15 in FGED3. Thor, the dog of thunder, is helping with some real-world BRDF references.
New blog post: A Decade of Slug This talks about the evolution of the Slug font rendering algorithm, and it includes an exciting announcement: The patent has been dedicated to the public domain. terathon.com/blog/decade-...
The equation editor called Radical Pie that I developed throughout 2025 has been getting a lot of nice feature updates over the four months since its initial release. We're already up to version 1.7. Free trial available on radicalpie.com.
I've written a new blog post called "Dual Approaches to Projective Geometric Algebra". terathon.com/blog/dual-pg...
I wrote a short blog post about the special mathematical / scientific font included with the Radical Pie equation editor. terathon.com/blog/radical...
When a is a vector and b is any multivector, the geometric product a ⟑ b decomposes as a ⟑ b = a ∧ b + b ∨ (a^★), and b ⟑ a decomposes as b ⟑ a = b ∧ a + (a_★) ∨ b. If a and b are both vectors, these both reduce to a ⟑ b = a ∧ b + a ⋅ b.
Whoa, the SIGGRAPH exhibit floor is tiny this year. This used to be a huge show! What the heck is going on? maps.goeshow.com/acm/siggraph...
This might be the first year since 1999 that I don't attend GDC.
This is a reminder that every diagram from my book Projective Geometric Algebra Illuminated is available on Wikimedia Commons under the CC-BY-4.0 license. They can be freely used in slides, papers, books, Wikipedia articles, etc., with proper attribution. commons.wikimedia.org/wiki/User:Er...
I've worked very hard over many years to develop a complete and correct picture of Grassmann and geometric algebras, often in the face of extreme antagonism. The results of my efforts are now being adopted by prominent scientists and engineers in various fields.
John Christian's new book Fundamentals of Spacecraft Optical Navigation arrived today.
I added LaTeX output to the latest version of Radical Pie, which was released today. It can't handle everything that Radical Pie can do, but it tries its best to faithfully reproduce equations that can be written in basic LaTeX code without requiring obscure packages.
FGED3 adds five new chapters to the series: 11 • Curves 12 • Motion Operators 13 • Models and Animation 14 • Advanced Shading 15 • Special Effects I'm shooting for a SIGGRAPH 2026 release. (The cover is not necessarily final.)
Some things I learned when talking to people at JMM this week: • Most find the Radical Pie UI to be very intuitive. • A Mac version would be useful even if it doesn't integrate with Word as it does on Windows. • Nobody likes the Microsoft Office equation editor. And I mean nobody.
I’ve been getting a lot of great reactions from people discovering Radical Pie at the Joint Mathematics Meetings this week.
