09-16-2001
Neo,
any idea how to configure it back to the Normal state. If let say i chose a mistake setting on my Mouse How to configure it back. Or perhaps how to search and configur it back to be the normal. I guess the only stupid thing i did on this is i chose the Microsoft Intellimouse when i was upgrading, i guess its not supported yet. Anyhow pls advise, To make it changed to normal.
Thnkx
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LEARN ABOUT CENTOS
polygon_z_normal
polygon_z_normal(3alleg4) Allegro manual polygon_z_normal(3alleg4)
NAME
polygon_z_normal, polygon_z_normal_f - Finds the Z component of the normal vector to three vertices. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed polygon_z_normal(const V3D *v1, const V3D *v2, const V3D *v3);
float polygon_z_normal_f(const V3D_f *v1, const V3D_f *v2, const V3D_f *v3);
DESCRIPTION
Finds the Z component of the normal vector to the specified three vertices (which must be part of a convex polygon). This is used mainly in
back-face culling. The back-faces of closed polyhedra are never visible to the viewer, therefore they never need to be drawn. This can cull
on average half the polygons from a scene. If the normal is negative the polygon can safely be culled. If it is zero, the polygon is per-
pendicular to the screen.
However, this method of culling back-faces must only be used once the X and Y coordinates have been projected into screen space using
persp_project() (or if an orthographic (isometric) projection is being used). Note that this function will fail if the three vertices are
co-linear (they lie on the same line) in 3D space.
SEE ALSO
cross_product(3alleg4), ex3d(3alleg4)
Allegro version 4.4.2 polygon_z_normal(3alleg4)