1al_perspective_transform(3)                        al_perspective_transform(3)
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NAME

6       al_perspective_transform - Allegro 5 API
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              void al_perspective_transform(ALLEGRO_TRANSFORM *trans,
12                 float left, float top, float n,
13                 float right, float bottom, float f)
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DESCRIPTION

16       Like  al_orthographic_transform(3)  but  honors perspective.  If every‐
17       thing is at a z-position of -near it will look the same as with an  or‐
18       thographic transformation.
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20       To use a specific horizontal field of view you can use the relation:
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22              tan(hfov / 2) = (right - left) / 2 / near
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SINCE

25       5.1.3
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SEE ALSO

28       al_use_projection_transform(3), al_orthographic_transform(3)
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32Allegro reference manual                           al_perspective_transform(3)