OSGCylinderVolume.cpp

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//---------------------------------------------------------------------------
//  Includes
//---------------------------------------------------------------------------

#include "OSGConfig.h"

#include <assert.h>

#include <OSGPlane.h>
#include <OSGVolume.h>

#include "OSGCylinderVolume.h"

OSG_USING_NAMESPACE


void CylinderVolume::getCenter(Pnt3f &center) const
{
    center = _axisPos + _axisDir * .5;
}


Real32 CylinderVolume::getScalarVolume(void) const
{
    return isEmpty() ? 0.0f : (_radius * _radius * Pi * _axisDir.length());
}

void CylinderVolume::getBounds(Pnt3f &min, Pnt3f &max) const
{
    for(UInt32 i = 0; i < 3; i++) 
    {
        min[i] = _axisPos[i] - _radius;
        max[i] = _axisPos[i] + _radius;
        ((_axisDir[i] < 0) ? min[i] : max[i]) += _axisDir[i];
    }    
}

/*-------------------------- extending ------------------------------------*/

#ifdef __sgi
#pragma set woff 1209
#endif

void CylinderVolume::extendBy(const Pnt3f &OSG_CHECK_ARG(pt))
{
    assert(false);
}


void CylinderVolume::extendBy(const Volume &volume)
{
  OSG::extend(*this, volume);
}

#ifdef __sgi
#pragma reset woff 1209
#endif


/*-------------------------- intersection ---------------------------------*/

bool CylinderVolume::intersect(const Pnt3f &point) const
{
    Real32 dist = Line(_axisPos, _axisDir).distance(point);

    if(dist > _radius)
        return false;

    Plane bottom( _axisDir, _axisPos           );
    Plane top   (-_axisDir, _axisPos + _axisDir);

    bool inspace = bottom.isInHalfSpace(point) && top.isInHalfSpace(point);

    return inspace;
}


bool CylinderVolume::intersect(const Line &line) const
{
    return line.intersect(*this);
}

bool CylinderVolume::intersect(const Line   &line,
                                     Real32 &enter, 
                                     Real32 &exit ) const
{
    return line.intersect(*this, enter, exit);
}

bool CylinderVolume::intersect(const Volume &volume) const
{
    return OSG::intersect(*this,volume);
}


bool CylinderVolume::isOnSurface(const Pnt3f &point) const
{
    Real32 dist = Line(_axisPos, _axisDir).distance(point);

    if(dist > _radius)
        return false;
    
    Plane bottom(-_axisDir, _axisPos           );
    Plane top   ( _axisDir, _axisPos + _axisDir);

    bool onplane = bottom.isOnPlane(point) || top.isOnPlane(point);

    return  ( onplane &&  dist <= _radius            ) ||
            (!onplane && osgabs(dist - _radius) < Eps);
}

/*-------------------------- transformation -------------------------------*/

void CylinderVolume::transform(const Matrix&  mtx)
{
     // get pos & axis
     Pnt3f p;
     Vec3f v, v2, v3;
     getAxis(p,v);

     // find perpendicular vector (to detect radius transformation)
     v2 = v;
     v2.normalize();
     v3 = v2.x() > 0.9 ? Vec3f(0,1,0) : Vec3f(1,0,0);
     v3.crossThis(v2);

     // transform
     mtx.mult(p);
     mtx.mult(v);
     mtx.mult(v3);

     // update
     setAxis(p,v);
     setRadius(getRadius() * v3.length());
}

#ifdef __sgi
#pragma reset woff 1209
#endif


void CylinderVolume::dump(      UInt32    OSG_CHECK_ARG(uiIndent), 
                          const BitVector OSG_CHECK_ARG(bvFlags )) const
{
    PLOG << "Cylinder(" 
         << _axisPos 
         << "|" 
         << _axisDir
         << "|" 
         << _radius
         << ")";
}

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