According to Veidemanis (see the source below), Polanski's 1979 film of the Hardy novel portrays Tess as passive, weak, and childlike. However, Hardy conveys the strength and unrelenting quality of his heroine, who is unrepentant about what she has done.
In the novel, as Veidemanis points out, Tess is asleep when Alec rapes her. However, in Polanski's film, she is awake and gives in to Alec. In the novel, Tess only succumbs to Alec after rebuffing him on several occasions, but she gives into him more rapidly and easily in the film. Hardy is able to convey, as the source below points out, the extreme emotional enervation of his character before she submits to Alec, but the film does not capture Tess's emotional state. In addition, Alec is portrayed as a kind of dandy in the film, but he is close to devilish in the novel and is likened to Satan. The film is similar to the novel in keeping some of the dialogue from the book.
Veidemanis, Gladys V. “‘Tess of the D'Urbervilles:"...
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