threeify is a TypeScript monorepo providing a WebGL2-based 3D rendering library with a focus on physically-based rendering (PBR), glTF support, and modular architecture. It is loosely derived from three.js but aims for a more modern, tree-shakeable design with native WebGL2 abstractions. The library includes a comprehensive math package (vectors, matrices, quaternions, colors, bounding volumes), a scene graph with cameras, lights, and materials (including clearcoat, sheen, transmission, and anisotropic extensions), a renderer with post-processing effects (tone mapping, Gaussian blur, bloom, cubemap background), a 2D layer compositor with blend modes and panorama support, and a custom GLSL-to-TypeScript transpiler for shader management. The codebase is organized into packages (core, math, scene, layer-compositor) and tools, with over 50 interactive examples demonstrating various rendering techniques. External dependencies include WebGL2 and browser APIs; the library is still in development and not yet recommended for production use.