As part of some recent work in procedural mesh generation, I’ve been working with a computational geometry library called geometry-central to trace geodesic paths on the surface of 3D meshes. geometry-central is written in C++, and I compiled the library to WebAssembly with Emscripten in order to use it in the browser.
As I recently learned, a geodesic path is the straightest path along a surface. It’s the path you would take if you were to walk in a straight line across the surface of some manifold for some distance in some direction.

Casey Primozic

A developer working on procedural mesh generation needed to trace millions of geodesic paths using the geometry-central C++ library (compiled to WebAssembly via Emscripten). Profiling revealed that Eigen's ColPivHouseholder solver was the bottleneck in the Cartesian-to-barycentric coordinate conversion. By replacing the generic Eigen solver with a direct, inline math implementation sourced from Gamedev Stack Exchange (originally from Christer Ericson's Real-Time Collision Detection), the function achieved over 3x speedup. The optimized code was pushed to a public fork of geometry-central.

Speeding Up Geodesic Tracing in geometry-central