Eric Lengyel (pronounced LENG · el, with no Y) is the founder of Terathon Software. He holds a Ph.D. in Computer Science from the University of California, Davis, and a Masters Degree in Mathematics from Virginia Tech.
Eric is the creator of the following technologies:
Eric is the author of the book series Foundations of Game Engine Development, and he is the editor for the Game Engine Gems series. Over 20 years ago, he wrote the first book focused on mathematics in games, the bestselling Mathematics for 3D Game Programming & Computer Graphics. Eric has also been a longtime member of the editorial board for the Journal of Graphics Tools, and he has been a major contributor to the successful Game Programming Gems series.
Eric is an active researcher in the field of projective geometric algebra and recently authored the book Projective Geometric Algebra Illuminated. The educational resources that he has created for this subject can be found on projectivegeometricalgebra.org.
Eric previously worked in the advanced technology group at Naughty Dog and the graphics and imaging department at Apple. Before those, he was the lead programmer for the fifth installment of Sierra Studio’s popular RPG adventure series Quest for Glory. When he’s not at his desk, Eric can usually be found running somewhere in the mountains of northern California.
Eric’s email address is lengyel at this website’s domain.GPUCentered Font Rendering Directly from Glyph Outlines Eric Lengyel, 2017 

The Open Game Engine Exchange Format Eric Lengyel, 2016 

Fog with a Linear Density Function Eric Lengyel, 2016 

Smooth Horizon Mapping Eric Lengyel, 2016 

A JitterTolerant Rigid Body Sleep Condition Eric Lengyel, 2011 

Bit Hacks for Games Eric Lengyel, 2011 

Motion Blur and the VelocityDepthGradient Buffer Eric Lengyel, 2010 

Moments of Inertia for Common Shapes Eric Lengyel, 2010 

Transition Cells for Dynamic Multiresolution Marching Cubes Eric Lengyel, 2010 

Unified Distance Formulas for Halfspace Fog Eric Lengyel, 2007 

On Faster SphereBox Overlap Testing Thomas Larsson, Tomas AkenineMöller, and Eric Lengyel, 2007 

Oblique View Frustums for Mirrors and Portals Eric Lengyel, 2005 

Oblique Depth Projection and View Frustum Clipping Eric Lengyel, 2005 

TJunction Elimination and Retriangulation Eric Lengyel, 2002 

The Mechanics of Robust Stencil Shadows Eric Lengyel, 2002 

Applying Decals to Arbitrary Surfaces Eric Lengyel, 2001 

Tweaking a Vertex’s Projected Depth Value Eric Lengyel, 2000 

A Fast CylinderFrustum Intersection Test Eric Lengyel, 2000 

Simultaneous CrossPlatform Game Development Eric Lengyel, 2000 

3D Graphics Engine Essentials Eric Lengyel, 1999 
Projective Geometric Algebra and Rigid Transformations NASA 2024 

Foundations of Projective Geometric Algebra NASA Goddard Space Flight Center 2024 

Practical Projective Geometric Algebra Game Developers Conference 2023 

New Developments in Projective Geometric Algebra Game Developers Conference 2021 

GPUCentered Font Rendering Directly from Glyph Outlines Symposium on Interactive 3D Graphics and Games 2018 

GPU Font Rendering: Current State of the Art Blizzard Seminar 2018 

Game Developers Conference 2018 

Game Developers Conference 2015 

Grassmann Algebra in Game Development Game Developers Conference 2014 

Fundamentals of Grassmann Algebra Game Developers Conference 2012 

A Bigger Mathematical Picture for Computer Graphics Winter School of Computer Graphics Keynote 2012  
The Return of Forgotten Mathematics in Computer Graphics Freie Universität Berlin 2012 

McMaster University 2007 

Game Developers Conference 2007 

Advanced Light and Shadow Culling Methods Game Developers Conference 2006 

Advanced Stencil Shadow and Penumbral Wedge Rendering Game Developers Conference 2005 
Binary Fundamentals Eric Lengyel, 2023 

The Slug Algorithm Eric Lengyel, 2021 

The C4 Engine Architecture Eric Lengyel, 2021 

The Transvoxel Algorithm Eric Lengyel, 2018 

Open Data Description Language Eric Lengyel, 2020 

Projective Geometric Algebra Eric Lengyel, 2024 

Conformal Geometric Algebra Eric Lengyel, 2024 
VoxelBased Terrain for RealTime Virtual Simulations Eric Lengyel, University of California Davis, 2009 

Hyperreal Structures Arising from an Infinite Base Logarithm Eric Lengyel, Virginia Tech, 1996 
Quest for Glory V: Dragon Fire Yosemite Entertainment / Sierra Studios 