clip3d(3alleg4) Allegro manual clip3d(3alleg4)NAME
clip3d - Clips the polygon given in vtx using fixed point math. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int clip3d(int type, fixed min_z, fixed max_z, int vc, const V3D *vtx[], V3D *vout[], V3D *vtmp[], int out[]);
DESCRIPTION
Fixed point version of clip3d_f(). This function should be used with caution, due to the limited precision of fixed point arithmetic and
high chance of rounding errors: the floating point code is better for most situations.
RETURN VALUE
Returns the number of vertices after clipping is done.
SEE ALSO polygon3d(3alleg4), clip3d_f(3alleg4)Allegro version 4.4.2 clip3d(3alleg4)
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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 4.4.2 clip3d_f(3alleg4)
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