He started with amateur short films after acquiring a projector and a 8mm camera in 1947.
In 1957, Hladnik moved to Paris to apprentice under French filmmakers such as Claude Chabrol, Philippe de Broca, and Robert Siodmak.
He made many films dealing openly with sex and his Erotikon [de] (1963), with its openly sensual approach to taboo sexual relationships, not only triggered angry protests in the press, but it also led to it being banned in some Yugoslav republics.
Western European critics and public however, supported Hladnik enough for him to find foreign backing for his even more provocative feature film on sexuality, Maškarada/Masquerade (1971).
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