iiinova — where your digital self keeps evolving

Eric Lengyel @ericlengyel.bsky.social · 27/09/2026

I'm very grateful that my book is still getting reviews like this two and a half years after publication. www.amazon.com/dp/B0CXY8C72...

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Reposted by Eric Lengyel

Kirill Osenkov @kirillosenkov.com · 22/08/2026

I bought Radical Pie and played with it, and it's delightful It must have been such a blast to work on @disconcision.com @neurocy.bsky.social have you seen this?

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Eric Lengyel @ericlengyel.bsky.social · 16/08/2026

I talked to someone at Microsoft support today and identified myself as the creator of Radical Pie. I demonstrated a serious bug in PowerPoint that I wanted to report. He immediately said there was no issue in PowerPoint and that I should contact the developers of Radical Pie.🤦‍♂️

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Eric Lengyel @ericlengyel.bsky.social · 11/08/2026

Radical Pie runs just fine under Wine for Mac.

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Eric Lengyel @ericlengyel.bsky.social · 07/08/2026

It has been about 10 months since Radical Pie was first released. In that time, 14 free updates have been provided containing new typographic capabilities, new usability features, expanded LaTeX compatibility, and lots of additions to the built-in math font. radicalpie.com

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Eric Lengyel @ericlengyel.bsky.social · 25/07/2026

The slides from my talks at the Better Software Conference are now available here: terathon.com/lengyel/#spe...

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Eric Lengyel @ericlengyel.bsky.social · 24/07/2026

I just returned home from an amazing week at the Better Software Conference in Sweden. So many great people there, and very impressive content.

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Eric Lengyel @ericlengyel.bsky.social · 11/07/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 10/07/2026

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

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Eric Lengyel @ericlengyel.bsky.social · 07/07/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 18/06/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 18/06/2026

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!

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Eric Lengyel @ericlengyel.bsky.social · 03/06/2026

I'm going to be speaking at the Better Software Conference in Sweden next month. Details to come. bettersoftwareconference.com

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Eric Lengyel @ericlengyel.bsky.social · 27/04/2026

I have posted the slides from my talk at the Virginia Tech geometry seminar last week: terathon.com/pga_relativi...

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Eric Lengyel @ericlengyel.bsky.social · 21/04/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 12/04/2026

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...

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Eric Lengyel @ericlengyel.bsky.social · 11/04/2026

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

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Eric Lengyel @ericlengyel.bsky.social · 02/04/2026

NASA has a live stream of the Artemis II mission that will run for the entire duration: www.youtube.com/watch?v=m3kR...

youtube.com

NASA's Artemis II Live Mission Coverage (Official Broadcast)

YouTube video by NASA

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Eric Lengyel @ericlengyel.bsky.social · 25/03/2026

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

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Eric Lengyel @ericlengyel.bsky.social · 25/03/2026

Currently working on fur rendering for Chapter 15 in FGED3. Thor, the dog of thunder, is helping with some real-world BRDF references.

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Eric Lengyel @ericlengyel.bsky.social · 17/03/2026

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-...

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Eric Lengyel @ericlengyel.bsky.social · 09/03/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 02/03/2026

I've written a new blog post called "Dual Approaches to Projective Geometric Algebra". terathon.com/blog/dual-pg...

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Eric Lengyel @ericlengyel.bsky.social · 27/02/2026

I wrote a short blog post about the special mathematical / scientific font included with the Radical Pie equation editor. terathon.com/blog/radical...

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Eric Lengyel @ericlengyel.bsky.social · 06/02/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 29/01/2026

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...

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Eric Lengyel @ericlengyel.bsky.social · 29/01/2026

This might be the first year since 1999 that I don't attend GDC.

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Eric Lengyel @ericlengyel.bsky.social · 27/01/2026

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...

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Reposted by Eric Lengyel

Robin Green @fatlimey.bsky.social · 23/01/2026

Lengyel's conventions. Fuck yeah.

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Eric Lengyel @ericlengyel.bsky.social · 23/01/2026

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.

Pose Estimation in the Geometric Algebra G(3,0,1) by Russell Carpenter.

Fundamentals of Spacecraft Optical Navigation by John Christian.

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Eric Lengyel @ericlengyel.bsky.social · 23/01/2026

John Christian's new book Fundamentals of Spacecraft Optical Navigation arrived today.

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Eric Lengyel @ericlengyel.bsky.social · 19/01/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 18/01/2026

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.)

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Eric Lengyel @ericlengyel.bsky.social · 09/01/2026

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.

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Eric Lengyel @ericlengyel.bsky.social · 06/01/2026

I’ve been getting a lot of great reactions from people discovering Radical Pie at the Joint Mathematics Meetings this week.

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Eric Lengyel @ericlengyel.bsky.social · 03/01/2026

I’m in Washington DC for the Joint Mathematics Meetings. The exhibits open tomorrow, and Radical Pie is right up front.

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Eric Lengyel @ericlengyel.bsky.social · 01/01/2026

Tomorrow, I leave for Washington DC where I'll be showing the brand new Radical Pie equation editor at the Joint Mathematics Meetings conference. If you're attending, come check it out at booth #505. I'm also going to have plenty of materials about projective geometric algebra.

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Eric Lengyel @ericlengyel.bsky.social · 01/01/2026

Version 1.2 of the Radical Pie equation editor has been released. This version contains some new features and a couple minor bug fixes. This is a free upgrade for all users. radicalpie.com

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Eric Lengyel @ericlengyel.bsky.social · 31/12/2025

Slug version 7.5 has been released. This update includes several small feature improvements. sluglibrary.com

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Reposted by Eric Lengyel

Robin Green @fatlimey.bsky.social · 20/12/2025

The MathPad 1A mini keyboard from @summacogni.bsky.social works spectacularly for #emacs org-mode, LaTeX in Markdown and surprisingly also with the #radicalpie equation editor from @ericlengyel.bsky.social out of the box I'd maybe change the sub & super-script indices that insert unicode not boxes.

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Eric Lengyel @ericlengyel.bsky.social · 17/12/2025

For the upcoming JMM conference, I've got FGED1, FGED2, PGA Illuminated, the OpenGEX specification, my Master's Thesis, Dissertation, and a bunch of papers all remastered with Radical Pie for a total of 13,157 equations. I'd say it's sufficiently tested.

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Eric Lengyel @ericlengyel.bsky.social · 14/12/2025

I built a new shipping crate in my garage that I'll be using to send stuff to trade shows. It's on its way to Washington DC now for the Joint Mathematics Meetings in early January, where I'm introducing the Radical Pie equation editor.

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Eric Lengyel @ericlengyel.bsky.social · 08/12/2025

Radical Pie is the official lanyard sponsor of the Joint Mathematics Meetings 2026. This is the largest mathematics conference in the U.S. and a perfect place for the Radical Pie equation editor to make its academic debut.

Joint Mathematics Meetings 2026, Washington DC, January 4-7.

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Eric Lengyel @ericlengyel.bsky.social · 21/11/2025

Visual Studio 2026 has a new "Generate preprocessed output for any C++ file" feature that brings us one step closer to parity with the development functionality available in 1995 with CodeWarrior.

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Eric Lengyel @ericlengyel.bsky.social · 20/11/2025

Version 1.1 of the Radical Pie equation editor has been released. This is a free upgrade for all users. radicalpie.com

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Eric Lengyel @ericlengyel.bsky.social · 18/11/2025

Projective Geometric Algebra Illuminated has also been remastered with the Radical Pie equation editor in both the soft and hard cover formats. The content is the same, but all 4919 equations appearing in the text plus every equation in every figure has been upgraded with RP.

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Eric Lengyel @ericlengyel.bsky.social · 18/11/2025

FGED 1&2 have been remastered with the Radical Pie equation editor, and the new versions are now available on Amazon (links below). The content is exactly the same, but the mathematical typesetting got an upgrade. The remaster applies to the soft cover versions only.

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Eric Lengyel @ericlengyel.bsky.social · 02/11/2025

Writing documentation and watching game 7 of the World Series tonight.

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Eric Lengyel @ericlengyel.bsky.social · 01/11/2025

New blog post about the development of Radical Pie: terathon.com/blog/radical...

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