al_perspective_transform(3)

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(3) 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(3), al_orthographic_transform(3)