PixiJS made our dynamic brush engine possible. Handling complex triangle-strip meshes and keeping vector drawing pinned at 60fps over local video streams without burning CPU would have taken months to write from scratch in raw WebGL. The API is rock-solid.
Pixi.js powers Retina's cinematic effects layer: smart-zoom interpolation, cursor smoothing, frame styling, background gradients. WebGL-accelerated 2D rendering with a mature filter system. Three.js was overkill for 2D-only work; p5.js wasn't built for production performance. Pixi hit the sweet spot — GPU-fast, filter-rich, predictable frame budget.
p5.js
Three.js