NAME

       al_perspective_transform - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              void al_perspective_transform(ALLEGRO_TRANSFORM *trans,
                 float left, float top, float n,
                 float right, float bottom, float f)

DESCRIPTION

       Like  al_orthographic_transform(3alleg5)  but  honors  perspective.   If everything is at a z-position of
       -near it will look the same as with an orthographic transformation.

       To use a specific horizontal field of view you can use the relation:

              tan(hfov / 2) = (right - left) / 2 / near

SINCE

       5.1.3

SEE ALSO

       al_use_projection_transform(3alleg5), al_orthographic_transform(3alleg5)

Allegro reference manual                                                       al_perspective_transform(3alleg5)