Man pages matching name al_transform_coordinates_3d_projective in section 3alleg5:

al_transform_coordinates_3d_projective.3alleg5.en	debian 10 / allegro5-doc
al_transform_coordinates_3d_projective.3alleg5.en	debian 11 / allegro5-doc
al_transform_coordinates_3d_projective.3alleg5.en	debian 12 / allegro5-doc