Speaking of subjectivity in cinema: for those who are in town this weekend and want to hazard the open air, Rooftop Films is screening, in première Saturday night, an extraordinary independent film, “Sun Don’t Shine,” that I saw at the Maryland Film Festival last month. I won’t say too much about it now in advance of a proper release (which it so richly deserves). For her first feature, the director, Amy Seimetz, has made a Southern road-movie film noir in contemporary Florida with a pair of actors (Kentucker Audley and Kate Lyn Sheil) who inhabit their roles with a quiet fury. Seimetz, who is best known as an actress (in such films as “Alexander the Last” and “Open Five”), finds amazingly simple yet powerful ways to get inside her characters’ minds while not straying from their story. There’s nothing neoclassical about her movie—it’s an exemplary work of modern cinema, made with an impressive curiosity and spontaneity—but it takes its place in the front rank of movies that extend genre by infusing it with the stuff of lived experience, of which, for movie artists such as Seimetz, movie-watching itself is a crucial part.