al_rotate_transform_3d - Allegro 5 API

       Combines the given transformation with a transformation which rotates coordinates around the given vector
       by the given angle in radians.

       Note: The vector is assumed to be of unit length (otherwise it will also incur a scale).

       al_rotate_transform_3d - Allegro 5 API

       5.1.3

Allegro reference manual                                                         al_rotate_transform_3d(3alleg5)

              #include <allegro5/allegro.h>

              void al_rotate_transform_3d(ALLEGRO_TRANSFORM *trans,
                 float x, float y, float z, float angle)