Half-Life models

A promo image of in-game scientist models.
A promo image of in-game security guard models and their details.
A promo image of the in-game alien slave (Vortigaunt) model in various poses and showing the increased detail of the mesh.
A promo image of the various human soldier models in various poses, heads, and skin colours.

In the early 2000s, I was involved in the Half-Life modding scene. The Playstation 2 version of the game had been released, and a bunch of us had discovered how to extract the more detailed character models that had shipped with that version of the game, in contrast to the really blocky and far less detailed ones in the 1998 PC version. Using this data, we mixed together the high polygon meshes of the Playstation 2 version with the higher resolution texture capacity of PCs at the time. Because the game had been designed with modding in mind, dropping our assets into the game was relatively easy from a technical point of view; the actual work of creating the assets was the real challenge.