No Restraint gives no easy push to those still on the Matthew Barney fence: Alison Chernick’s documentary refuses to provide any one eureka moment for grasping the art star’s ambitious interdisciplinary work or else confirm what many have long suspected to be Barney’s unchecked charlatanism. Frustratingly fair, it’s instead the kind of film satisfied to remain evenhanded when its subject invites the most extreme indictments or praise. Following Barney on transitory location (a Japanese whaling ship) for the shooting of his Drawing Restraint 9 Björk collaboration/film, No Restraint uses its fairly short running time to interview the former football player and current sensation’s collaborators, critics, supporters, and family. The bare facts of Barney’s ideas and craft — especially in regard to the DR9 project, a well-executed thing that, like all of his work, is half fantastical beauty and half arcane silliness — emerge, and Barney himself comes across as articulate, intelligent, and entirely without affected pretension, but none of these clues build to a completely illuminating portrait of an artist. Barney’s a difficult, controversial figure: No Restraint does him justice, but the epic scope of his ongoing personal mythology demands a deeper study than this polite sketch.