I don't think S.T.A.L.K.E.R. bears much relation to Roadside Picnic. There are no monsters in the novel (the zombies are "returned people" and are harmless), an

I don't think S.T.A.L.K.E.R. bears much relation to Roadside Picnic. There are no monsters in the novel (the zombies are "returned people" and are harmless), and the deadly traps are unknowable and nonsentient things more like forces of nature rather than beasts hunting people. Plus there's no radioactivity nor connection to Chernobyl. The plot happens in an unnamed American city, even! The novel is not a horror novel. It may be considered existential horror, though.