NAME

       persp_project,  persp_project_f  -  Projects  a  3d  point into 2d screen space. Allegro game programming
       library.

SYNOPSIS

       #include <allegro.h>

       void persp_project(fixed x, fixed y, fixed z, fixed *xout, fixed *yout);

       void persp_project_f(float x, float y, float z, float *xout, float *yout);

DESCRIPTION

       Projects the 3d point (x, y, z) into 2d screen space, storing the result in (*xout, *yout) and using  the
       scaling  parameters  previously set by calling set_projection_viewport(). This function projects from the
       normalized viewing pyramid, which has a camera at the origin and facing along the positive z axis. The  x
       axis  runs  left/right,  y  runs up/down, and z increases with depth into the screen. The camera has a 90
       degree field of view, ie. points on the planes x=z and -x=z will map onto the left and right edges of the
       screen,  and  the  planes  y=z  and -y=z map to the top and bottom of the screen. If you want a different
       field of view or camera location, you should transform all  your  objects  with  an  appropriate  viewing
       matrix,  eg.  to  get the effect of panning the camera 10 degrees to the left, rotate all your objects 10
       degrees to the right.

SEE ALSO

       set_projection_viewport(3alleg4), get_camera_matrix(3alleg4), ex3d(3alleg4), exstars(3alleg4)