clip3d_f

clip3d_f(3alleg4)                Allegro manual                clip3d_f(3alleg4)



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)