Pina, Wim Wenders’ gorgeous 3D document of the Tanztheatre Wuppertal, might not leave you in tears, but it may well convert the uninitiated: fans of Wenders who know nothing of the late choreographer; devotees of Bausch unfamiliar with the German’ director’s arthouse favorites Wings of Desire and Buena Vista Social Club; and finally, film skeptics who feel 3D adds nothing but a gimmick to the moviegoing experience.