clip3d_f(3) Allegro manual clip3d_f(3)
NAME
clip3d_f
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.
SEE ALSO
polygon3d(3), clip3d(3)
Allegro version 4.1.4 (WIP) clip3d_f(3)