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clip3d_f(3) Allegro manual clip3d_f(3) NAME clip3d_f - Clips the polygon given in vtx using floating point math, Alle- gro 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 re- sult 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 struc- tures. 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, clip- ping 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 perspec- tive 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(3), clip3d(3), excamera(3), exscn3d(3) Allegro version 4.4.3 clip3d_f(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
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