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set_projection_viewport(3)	Allegro	manual	    set_projection_viewport(3)

       set_projection_viewport - Sets the viewport used	to scale the output of
       persp_project().	Allegro	game programming library.

       #include	<allegro.h>

       void set_projection_viewport(int	x, int y, int w, int h);

       Sets the	viewport used to scale the output of the persp_project() func-
       tion.  Pass  the	 dimensions  of	the screen area	you want to draw onto,
       which will typically be 0, 0, SCREEN_W, and SCREEN_H. Also don't	forget
       to  pass	 an  appropriate  aspect ratio to get_camera_matrix later. The
       width and height	you specify here will determine	how big	your  viewport
       is  in  3d  space. So if	an object in your 3D space is w	units wide, it
       will fill the complete screen when you run into it (i.e., if it	has  a
       distance	 of  1.0  after	the camera matrix was applied. The fov and as-
       pect-ratio parameters to	 get_camera_matrix  also  apply	 some  scaling
       though, so this isn't always completely true). If you pass -1/-1/2/2 as
       parameters, no extra scaling will be performed by the projection.

       persp_project(3),    get_camera_matrix(3),    ex3d(3),	  excamera(3),
       exquat(3), exscn3d(3), exstars(3), exzbuf(3)

Allegro				 version 4.4.3	    set_projection_viewport(3)


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