root/juggler/tags/1.0.5/Math/vjVec3.cpp

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 *
 * VR Juggler is (C) Copyright 1998, 1999, 2000 by Iowa State University
 *
 * Original Authors:
 *   Allen Bierbaum, Christopher Just,
 *   Patrick Hartling, Kevin Meinert,
 *   Carolina Cruz-Neira, Albert Baker
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
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 * Library General Public License for more details.
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 * File:          $RCSfile$
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#include <vjConfig.h>
#include <Math/vjVec3.h>
#include <Math/vjMatrix.h>
#include <Math/vjVec4.h>


void vjVec3::xformFull(const vjMatrix& _m, const vjVec3& _v)
{
    vjVec4 tempVec(_v[0], _v[1], _v[2], 1.0f);
    tempVec.xform(_m, tempVec);

    float w_coord_div = 1/tempVec.vec[3];

    vec[0] = (tempVec.vec[0]* w_coord_div);
    vec[1] = (tempVec.vec[1]* w_coord_div);
    vec[2] = (tempVec.vec[2]* w_coord_div);
}

void vjVec3::xformVec(const vjMatrix& _m, const vjVec3& _v)
{
    vjVec4 tempVec(_v[0], _v[1], _v[2], 0.0f);
    tempVec.xform(_m, tempVec);

    vec[0] = tempVec.vec[0];
    vec[1] = tempVec.vec[1];
    vec[2] = tempVec.vec[2];
}

vjVec3 operator *(float _s, const vjVec3& _v) {
    return vjVec3(_v[0]*_s, _v[1]*_s, _v[2]*_s);
}

vjVec3 operator *(const vjVec3& _v, float _s) {
    return vjVec3(_v[0]*_s, _v[1]*_s, _v[2]*_s);
}

vjVec3 operator /(const vjVec3& _v, float _s) {
    _s = 1.0f/_s;
    return vjVec3(_v[0]*_s, _v[1]*_s, _v[2]*_s);
}

//vjVec3 operator *(const vjVec3& _v, const vjMatrix&  _m) {
//    // transform as point (w=1), assuming affine transformation
//    // i.e. does not use slower dst.xformFullPt().
//    vjVec3 dst; dst.xformPt(_v, _m); return dst;
//}

std::ostream& operator<<(std::ostream& out, vjVec3& _v)
{
    for(int j=0;j<3;j++)
    {
        out << _v.vec[j] << (j < 2 ? ", " : "");
    }

    return out; 
}