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/*
*
* Some vector operations.
*
* Always use
* - vector with x components : float x[3], int x[3], etc
*
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
/* ------------------------------------------------------------------------- */
/* General format: op(a, b, c): a = b op c */
/* Copying is done cp <from, to> */
/* ------------------------------------------------------------------------- */
#include "MTC_vectorops.h"
#include <math.h>
void MTC_diff3Int(int v1[3], int v2[3], int v3[3])
{
v1[0] = v2[0] - v3[0];
v1[1] = v2[1] - v3[1];
v1[2] = v2[2] - v3[2];
}
/* ------------------------------------------------------------------------- */
void MTC_diff3Float(float v1[3], float v2[3], float v3[3])
{
v1[0] = v2[0] - v3[0];
v1[1] = v2[1] - v3[1];
v1[2] = v2[2] - v3[2];
}
/* ------------------------------------------------------------------------- */
void MTC_cross3Int(int v1[3], int v2[3], int v3[3])
{
v1[0] = v2[1]*v3[2] - v2[2]*v3[1];
v1[1] = v2[2]*v3[0] - v2[0]*v3[2];
v1[2] = v2[0]*v3[1] - v2[1]*v3[0];
}
/* ------------------------------------------------------------------------- */
void MTC_cross3Float(float v1[3], float v2[3], float v3[3])
{
v1[0] = v2[1]*v3[2] - v2[2]*v3[1];
v1[1] = v2[2]*v3[0] - v2[0]*v3[2];
v1[2] = v2[0]*v3[1] - v2[1]*v3[0];
}
/* ------------------------------------------------------------------------- */
void MTC_cross3Double(double v1[3], double v2[3], double v3[3])
{
v1[0] = v2[1]*v3[2] - v2[2]*v3[1];
v1[1] = v2[2]*v3[0] - v2[0]*v3[2];
v1[2] = v2[0]*v3[1] - v2[1]*v3[0];
}
/* ------------------------------------------------------------------------- */
int MTC_dot3Int(int v1[3], int v2[3])
{
return (v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2]);
}
/* ------------------------------------------------------------------------- */
float MTC_dot3Float(float v1[3], float v2[3])
{
return (v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2]);
}
/* ------------------------------------------------------------------------- */
void MTC_cp3Float(float v1[3], float v2[3])
{
v2[0] = v1[0];
v2[1] = v1[1];
v2[2] = v1[2];
}
/* ------------------------------------------------------------------------- */
void MTC_cp3FloatInv(float v1[3], float v2[3])
{
v2[0] = -v1[0];
v2[1] = -v1[1];
v2[2] = -v1[2];
}
/* ------------------------------------------------------------------------- */
void MTC_swapInt(int *i1, int *i2)
{
int swap;
swap = *i1;
*i1 = *i2;
*i2 = swap;
}
/* ------------------------------------------------------------------------- */
void MTC_diff3DFF(double v1[3], float v2[3], float v3[3])
{
v1[0] = v2[0] - v3[0];
v1[1] = v2[1] - v3[1];
v1[2] = v2[2] - v3[2];
}
/* ------------------------------------------------------------------------- */
float MTC_normalise3DF(float n[3])
{
float d;
d= n[0]*n[0]+n[1]*n[1]+n[2]*n[2];
/* FLT_EPSILON is too large! A larger value causes normalise errors in */
/* a scaled down utah teapot */
if(d>0.0000000000001) {
/* d= sqrt(d); This _should_ be sqrt, but internally it's a double*/
/* anyway. This is safe. */
d = sqrt(d);
n[0]/=d;
n[1]/=d;
n[2]/=d;
} else {
n[0]=n[1]=n[2]= 0.0;
d= 0.0;
}
return d;
}
/* ------------------------------------------------------------------------- */
/* eof */
|
