# cross_product(3alleg4) [opendarwin man page]

```cross_product(3alleg4)						  Allegro manual					    cross_product(3alleg4)

NAME
cross_product, cross_product_f - Calculates the cross product. Allegro game programming library.

SYNOPSIS
#include <allegro.h>

void cross_product(fixed x1, y1, z1, x2, y2, z2, *xout, *yout, *zout);

void cross_product_f(float x1, y1, z1, x2, y2, z2, *xout, *yout, *zout);

DESCRIPTION
Calculates  the	cross product (x1, y1, z1) x (x2, y2, z2), storing the result in (*xout, *yout, *zout). The cross product is perpendicular
to both of the input vectors, so it can be used to generate polygon normals.

dot_product(3alleg4), polygon_z_normal(3alleg4), normalize_vector(3alleg4), exstars(3alleg4)

Allegro 							   version 4.4.2					    cross_product(3alleg4)```

## Check Out this Related Man Page

```exstars(3alleg4)						  Allegro manual						  exstars(3alleg4)

NAME
exstars - 3d starfield and lightsourced spaceship. Allegro game programming library.

SYNOPSIS
#include <allegro.h>

Example exstars

DESCRIPTION
This program draws a 3D star field (depth-cued) and a polygon starship (controllable with the keyboard cursor keys), using the Allegro math
functions.

BITMAP(3alleg4), END_OF_MAIN(3alleg4), MATRIX(3alleg4),	PALETTE(3alleg4),  SCREEN_H(3alleg4),  SCREEN_W(3alleg4),  allegro_error(3alleg4),
allegro_init(3alleg4),	allegro_message(3alleg4),  apply_matrix(3alleg4),  blit(3alleg4),  clear_bitmap(3alleg4),  create_bitmap(3alleg4),
cross_product(3alleg4), destroy_bitmap(3alleg4), dot_product(3alleg4), fixed(3alleg4), fixmul(3alleg4),	fixtof(3alleg4),  fixtoi(3alleg4),
font(3alleg4),	  get_rotation_matrix(3alleg4),    get_transformation_matrix(3alleg4),	  get_translation_matrix(3alleg4),    install_key-
board(3alleg4),	  install_timer(3alleg4),    itofix(3alleg4),	  key(3alleg4),     normalize_vector(3alleg4),	   palette_color(3alleg4),
persp_project(3alleg4),	poll_keyboard(3alleg4),  putpixel(3alleg4),  rectfill(3alleg4),  screen(3alleg4),  set_gfx_mode(3alleg4), set_pal-
ette(3alleg4),	 set_projection_viewport(3alleg4),    textout_centre_ex(3alleg4),    textprintf_centre_ex(3alleg4),	triangle(3alleg4),
vsync(3alleg4)

Allegro 							   version 4.4.2						  exstars(3alleg4)```
Man Page

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