95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* Copyright (C) 1996-1997 Id Software, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
See file, 'COPYING', for details.
|
|
*/
|
|
|
|
#include <common/cmdlib.h>
|
|
#include <common/mathlib.h>
|
|
#include <assert.h>
|
|
|
|
const vec3_t vec3_origin = { 0, 0, 0 };
|
|
|
|
qboolean
|
|
VectorCompare(const vec3_t v1, const vec3_t v2)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
if (fabs(v1[i] - v2[i]) > EQUAL_EPSILON)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
CrossProduct(const vec3_t v1, const vec3_t v2, vec3_t cross)
|
|
{
|
|
cross[0] = v1[1] * v2[2] - v1[2] * v2[1];
|
|
cross[1] = v1[2] * v2[0] - v1[0] * v2[2];
|
|
cross[2] = v1[0] * v2[1] - v1[1] * v2[0];
|
|
}
|
|
|
|
/*
|
|
* VecStr - handy shortcut for printf, not thread safe, obviously
|
|
*/
|
|
const char *
|
|
VecStr(const vec3_t vec)
|
|
{
|
|
static char buffers[8][20];
|
|
static int current = 0;
|
|
char *buf;
|
|
|
|
buf = buffers[current++ & 7];
|
|
q_snprintf(buf, sizeof(buffers[0]), "%i %i %i",
|
|
(int)vec[0], (int)vec[1], (int)vec[2]);
|
|
|
|
return buf;
|
|
}
|
|
|
|
const char *
|
|
VecStrf(const vec3_t vec)
|
|
{
|
|
static char buffers[8][20];
|
|
static int current = 0;
|
|
char *buf;
|
|
|
|
buf = buffers[current++ & 7];
|
|
q_snprintf(buf, sizeof(buffers[0]), "%.2f %.2f %.2f",
|
|
vec[0], vec[1], vec[2]);
|
|
|
|
return buf;
|
|
}
|
|
|
|
// from http://mathworld.wolfram.com/SpherePointPicking.html
|
|
// eqns 6,7,8
|
|
void
|
|
RandomDir(vec3_t dir)
|
|
{
|
|
const vec_t theta = Random() * 2.0 * Q_PI;
|
|
const vec_t u = (2.0 * Random()) - 1.0;
|
|
|
|
const vec_t s = sqrt(1.0 - (u * u));
|
|
dir[0] = s * cos(theta);
|
|
dir[1] = s * sin(theta);
|
|
dir[2] = u;
|
|
|
|
for (int i=0; i<3; i++) {
|
|
assert(dir[i] >= -1.001);
|
|
assert(dir[i] <= 1.001);
|
|
}
|
|
}
|