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.TH "al_perspective_transform" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_perspective_transform \- Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include\ <allegro5/allegro.h>

void\ al_perspective_transform(ALLEGRO_TRANSFORM\ *trans,
\ \ \ float\ left,\ float\ top,\ float\ n,
\ \ \ float\ right,\ float\ bottom,\ float\ f)
\f[]
.fi
.SH DESCRIPTION
.PP
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.
.PP
To use a specific horizontal field of view you can use the relation:
.IP
.nf
\f[C]
tan(hfov\ /\ 2)\ =\ (right\ \-\ left)\ /\ 2\ /\ near
\f[]
.fi
.SH SINCE
.PP
5.1.3
.SH SEE ALSO
.PP
al_use_projection_transform(3alleg5), al_orthographic_transform(3alleg5)