PARIS — James Cameron will be at the Cannes Film Festival for the screening of his officially selected out-of-competition Titanic docu “Ghosts of the Abyss,” it was announced Wednesday.Pic’s narrator Bill Paxton and film crew members will also be there. Festgoers will be invited to don 3-D glasses for the Imax pic, which screens May 17 in the Palais des Festivals’ main Lumiere Amphitheater. The film recounts the efforts of a deep-sea research team to uncover the secrets of the long-sunken ocean liner Titanic. Cameron developed a special underwater camera system to capture the 3-D “Ghost” images. Pic, which opened in the U.S. in April, is being shown in Imax-format auditoriums and specially retrofitted 35mm theaters.