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Diffstat (limited to 'source/blender/blenlib/intern/vectorops.c')
| -rw-r--r-- | source/blender/blenlib/intern/vectorops.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/vectorops.c b/source/blender/blenlib/intern/vectorops.c new file mode 100644 index 00000000000..9314e7fca3e --- /dev/null +++ b/source/blender/blenlib/intern/vectorops.c @@ -0,0 +1,165 @@ +/* + * + * 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 */ |