Engine S.T.A.L.K.E.R. 2 / What engine the game is made

Many years have passed since the release of the last part of the trilogy S.T.A.L.K.E.R., and at the same time went into disrepair past development of game engines from GSC Game World. Even with the development phase of S.T.A.L.K.E.R. 2 at the beginning of this decade, the developments of the past years have become obsolete so quickly that they were completely sent to the archive, leaving only some successful concepts and solutions, while completely ignoring the seemingly ready-made models and mechanisms.