NAME

       clip3d_f - Clips the polygon given in vtx using floating point math, Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int  clip3d_f(int  type,  float  min_z,  float  max_z,  int  vc, const V3D_f *vtx[], V3D_f *vout[], V3D_f
       *vtmp[], int out[]);

DESCRIPTION

       Clips the polygon given in `vtx'. The number of vertices is `vc', the result goes in `vout',  and  `vtmp'
       and  `out' are needed for internal purposes. The pointers in `vtx', `vout' and `vtmp' must point to valid
       V3D_f structures.

       As additional vertices may appear in the process of clipping, so the size of  `vout',  `vtmp'  and  `out'
       should  be  at least vc * (1.5 ^ n), where `n' is the number of clipping planes (5 or 6), and `^' denotes
       "to the power of".

       The frustum (viewing volume) is defined by -z<x<z, -z<y<z, 0<min_z<z<max_z. If  max_z<=min_z, the z<max_z
       clipping is not done. As you can see, clipping is done in the camera space, with perspective in mind,  so
       this  routine  should be called after you apply the camera matrix, but before the perspective projection.
       The routine will correctly interpolate u, v, and c in the vertex structure. However, no provision is made
       for high/truecolor GCOL.

RETURN VALUE

       Returns the number of vertices after clipping is done.

SEE ALSO

       polygon3d(3alleg4), clip3d(3alleg4), excamera(3alleg4), exscn3d(3alleg4)

Allegro                                           version 4.4.3                                clip3d_f(3alleg4)