mirror of
https://github.com/UberGames/GtkRadiant.git
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12b372f89c
git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant@1 8a3a26a2-13c4-0310-b231-cf6edde360e5
578 lines
12 KiB
C
578 lines
12 KiB
C
/*
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Copyright (C) 1999-2006 Id Software, Inc. and contributors.
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For a list of contributors, see the accompanying CONTRIBUTORS file.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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// mathlib.c -- math primitives
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#include "mathlib.h"
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// we use memcpy and memset
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#include <memory.h>
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const vec3_t vec3_origin = {0.0f,0.0f,0.0f};
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const vec3_t g_vec3_axis_x = { 1, 0, 0, };
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const vec3_t g_vec3_axis_y = { 0, 1, 0, };
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const vec3_t g_vec3_axis_z = { 0, 0, 1, };
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/*
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================
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MakeNormalVectors
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Given a normalized forward vector, create two
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other perpendicular vectors
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================
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*/
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void MakeNormalVectors (vec3_t forward, vec3_t right, vec3_t up)
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{
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float d;
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// this rotate and negate guarantees a vector
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// not colinear with the original
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right[1] = -forward[0];
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right[2] = forward[1];
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right[0] = forward[2];
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d = DotProduct (right, forward);
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VectorMA (right, -d, forward, right);
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VectorNormalize (right, right);
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CrossProduct (right, forward, up);
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}
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vec_t VectorLength(const vec3_t v)
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{
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int i;
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float length;
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length = 0.0f;
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for (i=0 ; i< 3 ; i++)
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length += v[i]*v[i];
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length = (float)sqrt (length);
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return length;
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}
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qboolean VectorCompare (const vec3_t v1, const vec3_t v2)
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{
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int i;
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for (i=0 ; i<3 ; i++)
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if (fabs(v1[i]-v2[i]) > EQUAL_EPSILON)
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return qfalse;
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return qtrue;
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}
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void VectorMA( const vec3_t va, vec_t scale, const vec3_t vb, vec3_t vc )
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{
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vc[0] = va[0] + scale*vb[0];
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vc[1] = va[1] + scale*vb[1];
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vc[2] = va[2] + scale*vb[2];
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}
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void _CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross)
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{
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cross[0] = v1[1]*v2[2] - v1[2]*v2[1];
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cross[1] = v1[2]*v2[0] - v1[0]*v2[2];
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cross[2] = v1[0]*v2[1] - v1[1]*v2[0];
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}
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vec_t _DotProduct (vec3_t v1, vec3_t v2)
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{
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return v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2];
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}
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void _VectorSubtract (vec3_t va, vec3_t vb, vec3_t out)
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{
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out[0] = va[0]-vb[0];
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out[1] = va[1]-vb[1];
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out[2] = va[2]-vb[2];
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}
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void _VectorAdd (vec3_t va, vec3_t vb, vec3_t out)
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{
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out[0] = va[0]+vb[0];
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out[1] = va[1]+vb[1];
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out[2] = va[2]+vb[2];
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}
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void _VectorCopy (vec3_t in, vec3_t out)
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{
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out[0] = in[0];
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out[1] = in[1];
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out[2] = in[2];
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}
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vec_t VectorNormalize( const vec3_t in, vec3_t out ) {
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vec_t length, ilength;
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length = (vec_t)sqrt (in[0]*in[0] + in[1]*in[1] + in[2]*in[2]);
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if (length == 0)
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{
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VectorClear (out);
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return 0;
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}
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ilength = 1.0f/length;
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out[0] = in[0]*ilength;
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out[1] = in[1]*ilength;
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out[2] = in[2]*ilength;
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return length;
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}
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vec_t ColorNormalize( const vec3_t in, vec3_t out ) {
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float max, scale;
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max = in[0];
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if (in[1] > max)
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max = in[1];
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if (in[2] > max)
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max = in[2];
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if (max == 0) {
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out[0] = out[1] = out[2] = 1.0;
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return 0;
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}
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scale = 1.0f / max;
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VectorScale (in, scale, out);
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return max;
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}
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void VectorInverse (vec3_t v)
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{
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v[0] = -v[0];
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v[1] = -v[1];
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v[2] = -v[2];
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}
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/*
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void VectorScale (vec3_t v, vec_t scale, vec3_t out)
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{
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out[0] = v[0] * scale;
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out[1] = v[1] * scale;
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out[2] = v[2] * scale;
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}
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*/
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void VectorRotate (vec3_t vIn, vec3_t vRotation, vec3_t out)
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{
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vec3_t vWork, va;
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int nIndex[3][2];
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int i;
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VectorCopy(vIn, va);
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VectorCopy(va, vWork);
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nIndex[0][0] = 1; nIndex[0][1] = 2;
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nIndex[1][0] = 2; nIndex[1][1] = 0;
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nIndex[2][0] = 0; nIndex[2][1] = 1;
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for (i = 0; i < 3; i++)
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{
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if (vRotation[i] != 0)
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{
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float dAngle = vRotation[i] * Q_PI / 180.0f;
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float c = (vec_t)cos(dAngle);
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float s = (vec_t)sin(dAngle);
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vWork[nIndex[i][0]] = va[nIndex[i][0]] * c - va[nIndex[i][1]] * s;
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vWork[nIndex[i][1]] = va[nIndex[i][0]] * s + va[nIndex[i][1]] * c;
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}
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VectorCopy(vWork, va);
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}
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VectorCopy(vWork, out);
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}
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void VectorRotateOrigin (vec3_t vIn, vec3_t vRotation, vec3_t vOrigin, vec3_t out)
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{
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vec3_t vTemp, vTemp2;
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VectorSubtract(vIn, vOrigin, vTemp);
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VectorRotate(vTemp, vRotation, vTemp2);
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VectorAdd(vTemp2, vOrigin, out);
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}
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void VectorPolar(vec3_t v, float radius, float theta, float phi)
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{
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v[0]=(float)(radius * cos(theta) * cos(phi));
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v[1]=(float)(radius * sin(theta) * cos(phi));
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v[2]=(float)(radius * sin(phi));
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}
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void VectorSnap(vec3_t v)
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{
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int i;
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for (i = 0; i < 3; i++)
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{
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v[i] = (vec_t)FLOAT_TO_INTEGER(v[i]);
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}
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}
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void VectorISnap(vec3_t point, int snap)
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{
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int i;
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for (i = 0 ;i < 3 ; i++)
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{
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point[i] = (vec_t)FLOAT_SNAP(point[i], snap);
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}
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}
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void VectorFSnap(vec3_t point, float snap)
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{
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int i;
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for (i = 0 ;i < 3 ; i++)
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{
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point[i] = (vec_t)FLOAT_SNAP(point[i], snap);
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}
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}
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void _Vector5Add (vec5_t va, vec5_t vb, vec5_t out)
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{
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out[0] = va[0]+vb[0];
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out[1] = va[1]+vb[1];
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out[2] = va[2]+vb[2];
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out[3] = va[3]+vb[3];
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out[4] = va[4]+vb[4];
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}
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void _Vector5Scale (vec5_t v, vec_t scale, vec5_t out)
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{
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out[0] = v[0] * scale;
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out[1] = v[1] * scale;
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out[2] = v[2] * scale;
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out[3] = v[3] * scale;
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out[4] = v[4] * scale;
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}
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void _Vector53Copy (vec5_t in, vec3_t out)
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{
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out[0] = in[0];
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out[1] = in[1];
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out[2] = in[2];
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}
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// NOTE: added these from Ritual's Q3Radiant
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void ClearBounds (vec3_t mins, vec3_t maxs)
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{
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mins[0] = mins[1] = mins[2] = 99999;
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maxs[0] = maxs[1] = maxs[2] = -99999;
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}
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void AddPointToBounds (vec3_t v, vec3_t mins, vec3_t maxs)
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{
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int i;
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vec_t val;
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for (i=0 ; i<3 ; i++)
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{
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val = v[i];
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if (val < mins[i])
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mins[i] = val;
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if (val > maxs[i])
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maxs[i] = val;
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}
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}
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void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up)
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{
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float angle;
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static float sr, sp, sy, cr, cp, cy;
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// static to help MS compiler fp bugs
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angle = angles[YAW] * (Q_PI*2.0f / 360.0f);
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sy = (vec_t)sin(angle);
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cy = (vec_t)cos(angle);
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angle = angles[PITCH] * (Q_PI*2.0f / 360.0f);
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sp = (vec_t)sin(angle);
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cp = (vec_t)cos(angle);
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angle = angles[ROLL] * (Q_PI*2.0f / 360.0f);
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sr = (vec_t)sin(angle);
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cr = (vec_t)cos(angle);
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if (forward)
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{
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forward[0] = cp*cy;
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forward[1] = cp*sy;
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forward[2] = -sp;
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}
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if (right)
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{
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right[0] = -sr*sp*cy+cr*sy;
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right[1] = -sr*sp*sy-cr*cy;
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right[2] = -sr*cp;
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}
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if (up)
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{
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up[0] = cr*sp*cy+sr*sy;
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up[1] = cr*sp*sy-sr*cy;
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up[2] = cr*cp;
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}
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}
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void VectorToAngles( vec3_t vec, vec3_t angles )
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{
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float forward;
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float yaw, pitch;
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if ( ( vec[ 0 ] == 0 ) && ( vec[ 1 ] == 0 ) )
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{
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yaw = 0;
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if ( vec[ 2 ] > 0 )
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{
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pitch = 90;
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}
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else
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{
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pitch = 270;
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}
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}
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else
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{
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yaw = (vec_t)atan2( vec[ 1 ], vec[ 0 ] ) * 180 / Q_PI;
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if ( yaw < 0 )
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{
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yaw += 360;
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}
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forward = ( float )sqrt( vec[ 0 ] * vec[ 0 ] + vec[ 1 ] * vec[ 1 ] );
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pitch = (vec_t)atan2( vec[ 2 ], forward ) * 180 / Q_PI;
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if ( pitch < 0 )
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{
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pitch += 360;
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}
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}
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angles[ 0 ] = pitch;
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angles[ 1 ] = yaw;
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angles[ 2 ] = 0;
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}
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/*
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=====================
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PlaneFromPoints
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Returns false if the triangle is degenrate.
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The normal will point out of the clock for clockwise ordered points
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=====================
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*/
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qboolean PlaneFromPoints( vec4_t plane, const vec3_t a, const vec3_t b, const vec3_t c ) {
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vec3_t d1, d2;
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VectorSubtract( b, a, d1 );
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VectorSubtract( c, a, d2 );
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CrossProduct( d2, d1, plane );
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if ( VectorNormalize( plane, plane ) == 0 ) {
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return qfalse;
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}
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plane[3] = DotProduct( a, plane );
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return qtrue;
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}
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/*
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** NormalToLatLong
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**
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** We use two byte encoded normals in some space critical applications.
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** Lat = 0 at (1,0,0) to 360 (-1,0,0), encoded in 8-bit sine table format
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** Lng = 0 at (0,0,1) to 180 (0,0,-1), encoded in 8-bit sine table format
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**
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*/
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void NormalToLatLong( const vec3_t normal, byte bytes[2] ) {
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// check for singularities
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if ( normal[0] == 0 && normal[1] == 0 ) {
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if ( normal[2] > 0 ) {
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bytes[0] = 0;
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bytes[1] = 0; // lat = 0, long = 0
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} else {
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bytes[0] = 128;
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bytes[1] = 0; // lat = 0, long = 128
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}
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} else {
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int a, b;
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a = (int)( RAD2DEG( atan2( normal[1], normal[0] ) ) * (255.0f / 360.0f ) );
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a &= 0xff;
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b = (int)( RAD2DEG( acos( normal[2] ) ) * ( 255.0f / 360.0f ) );
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b &= 0xff;
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bytes[0] = b; // longitude
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bytes[1] = a; // lattitude
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}
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}
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/*
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=================
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PlaneTypeForNormal
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=================
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*/
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int PlaneTypeForNormal (vec3_t normal) {
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if (normal[0] == 1.0 || normal[0] == -1.0)
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return PLANE_X;
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if (normal[1] == 1.0 || normal[1] == -1.0)
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return PLANE_Y;
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if (normal[2] == 1.0 || normal[2] == -1.0)
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return PLANE_Z;
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return PLANE_NON_AXIAL;
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}
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/*
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================
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MatrixMultiply
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================
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*/
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void MatrixMultiply(float in1[3][3], float in2[3][3], float out[3][3]) {
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out[0][0] = in1[0][0] * in2[0][0] + in1[0][1] * in2[1][0] +
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in1[0][2] * in2[2][0];
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out[0][1] = in1[0][0] * in2[0][1] + in1[0][1] * in2[1][1] +
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in1[0][2] * in2[2][1];
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out[0][2] = in1[0][0] * in2[0][2] + in1[0][1] * in2[1][2] +
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in1[0][2] * in2[2][2];
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out[1][0] = in1[1][0] * in2[0][0] + in1[1][1] * in2[1][0] +
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in1[1][2] * in2[2][0];
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out[1][1] = in1[1][0] * in2[0][1] + in1[1][1] * in2[1][1] +
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in1[1][2] * in2[2][1];
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out[1][2] = in1[1][0] * in2[0][2] + in1[1][1] * in2[1][2] +
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in1[1][2] * in2[2][2];
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out[2][0] = in1[2][0] * in2[0][0] + in1[2][1] * in2[1][0] +
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in1[2][2] * in2[2][0];
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out[2][1] = in1[2][0] * in2[0][1] + in1[2][1] * in2[1][1] +
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in1[2][2] * in2[2][1];
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out[2][2] = in1[2][0] * in2[0][2] + in1[2][1] * in2[1][2] +
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in1[2][2] * in2[2][2];
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}
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void ProjectPointOnPlane( vec3_t dst, const vec3_t p, const vec3_t normal )
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{
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float d;
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vec3_t n;
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float inv_denom;
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inv_denom = 1.0F / DotProduct( normal, normal );
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d = DotProduct( normal, p ) * inv_denom;
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n[0] = normal[0] * inv_denom;
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n[1] = normal[1] * inv_denom;
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n[2] = normal[2] * inv_denom;
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dst[0] = p[0] - d * n[0];
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dst[1] = p[1] - d * n[1];
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dst[2] = p[2] - d * n[2];
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}
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/*
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** assumes "src" is normalized
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*/
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void PerpendicularVector( vec3_t dst, const vec3_t src )
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{
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int pos;
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int i;
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vec_t minelem = 1.0F;
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vec3_t tempvec;
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/*
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** find the smallest magnitude axially aligned vector
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*/
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for ( pos = 0, i = 0; i < 3; i++ )
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{
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if ( fabs( src[i] ) < minelem )
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{
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pos = i;
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minelem = (vec_t)fabs( src[i] );
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}
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}
|
|
tempvec[0] = tempvec[1] = tempvec[2] = 0.0F;
|
|
tempvec[pos] = 1.0F;
|
|
|
|
/*
|
|
** project the point onto the plane defined by src
|
|
*/
|
|
ProjectPointOnPlane( dst, tempvec, src );
|
|
|
|
/*
|
|
** normalize the result
|
|
*/
|
|
VectorNormalize( dst, dst );
|
|
}
|
|
|
|
/*
|
|
===============
|
|
RotatePointAroundVector
|
|
|
|
This is not implemented very well...
|
|
===============
|
|
*/
|
|
void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point,
|
|
float degrees ) {
|
|
float m[3][3];
|
|
float im[3][3];
|
|
float zrot[3][3];
|
|
float tmpmat[3][3];
|
|
float rot[3][3];
|
|
int i;
|
|
vec3_t vr, vup, vf;
|
|
float rad;
|
|
|
|
vf[0] = dir[0];
|
|
vf[1] = dir[1];
|
|
vf[2] = dir[2];
|
|
|
|
PerpendicularVector( vr, dir );
|
|
CrossProduct( vr, vf, vup );
|
|
|
|
m[0][0] = vr[0];
|
|
m[1][0] = vr[1];
|
|
m[2][0] = vr[2];
|
|
|
|
m[0][1] = vup[0];
|
|
m[1][1] = vup[1];
|
|
m[2][1] = vup[2];
|
|
|
|
m[0][2] = vf[0];
|
|
m[1][2] = vf[1];
|
|
m[2][2] = vf[2];
|
|
|
|
memcpy( im, m, sizeof( im ) );
|
|
|
|
im[0][1] = m[1][0];
|
|
im[0][2] = m[2][0];
|
|
im[1][0] = m[0][1];
|
|
im[1][2] = m[2][1];
|
|
im[2][0] = m[0][2];
|
|
im[2][1] = m[1][2];
|
|
|
|
memset( zrot, 0, sizeof( zrot ) );
|
|
zrot[0][0] = zrot[1][1] = zrot[2][2] = 1.0F;
|
|
|
|
rad = (float)DEG2RAD( degrees );
|
|
zrot[0][0] = (vec_t)cos( rad );
|
|
zrot[0][1] = (vec_t)sin( rad );
|
|
zrot[1][0] = (vec_t)-sin( rad );
|
|
zrot[1][1] = (vec_t)cos( rad );
|
|
|
|
MatrixMultiply( m, zrot, tmpmat );
|
|
MatrixMultiply( tmpmat, im, rot );
|
|
|
|
for ( i = 0; i < 3; i++ ) {
|
|
dst[i] = rot[i][0] * point[0] + rot[i][1] * point[1] + rot[i][2] * point[2];
|
|
}
|
|
}
|