GitHub has introduced a new feature that allows users to easily view 3D models, specifically STL files, directly on its platform. This new capability, powered by Three.js and utilizing WebGL when available, enables users to interact with 3D models by rotating them using click and drag, zooming with scroll, and altering view modes through provided links. The feature also includes a fallback to a slower canvas renderer if necessary. This enhancement aims to support the growing number of 3D projects on GitHub by offering a more interactive way to explore complex files. Mike Skalnik, identified by his handle @skalnik, encourages users to explore this new dimension of collaboration and provides a help article for further assistance.