`expand-vertex-data` is a small Node library that takes 3‑D model data whose positions, normals and UVs are stored with separate index arrays (as in Collada, OBJ, etc.) and expands them into a single set of indexed vertex attributes ready for WebGL ARRAY_BUFFER and ELEMENT_ARRAY_BUFFER use. It’s aimed at developers building real‑time graphics or WebGL applications who need to convert compact model formats into GPU‑friendly buffers, either at runtime or as a preprocessing step.