Warner Bros have decided to release the next two Harry Potter films in 3D, a move underscoring the post - Avatar rush for extra-dimensional box office. Warners has been testing footage from its upcoming Clash of the Titans - converted into 3D - and the tests have gone so well that executives have decided to release not only Titans but also the two-part Harry Potter and the Deathly Hallows in 3D, The Hollywood Reporter stated. Each film will cost just USD 5 million to change into 3D. Warners also will absorb an additional USD 5 million expense per pic to pay for 3D glasses for exhibitors handling the movies. In a related move, Warners will push back the release of Titans one week to April 2. Deathly Hallows: Part I is set to unspool on November 19, and Part II is slotted for July 15, 2011. The only previous Potter film to dabble in 3D was last year's Harry Potter and the Half-Blood Prince, which included brief footage viewable in 3D in Imax venues.