Intersector.cc

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#include <esg/Intersector.h>
#include <esg/geometry/Geometry.h>

using namespace esg;

void Intersector::init(int mask, float maxDist)
{
    if (_pEnv) delete _pEnv; // old result is lost forewer
    _pEnv       = NULL;
    _distance   = maxDist;
    _wantedMask = mask|ENV_WANT_DISTANCE;
    //_checkMask  = _wantedMask &
    //  (ENV_WANT_INTERSECTION|ENV_WANT_INTERFERENCE|ENV_WANT_DISTANCE);
}

PointEnv* Intersector::adoptIntersection()
{
    PointEnv* pRet = _pEnv;
    _pEnv          = NULL;
    return pRet;
}


int Intersector::processCandidate(SceneGraphObject* pObject,       
                                  const Vector3&    origin,  
                                  const Vector3&    direction)
{
    if (!pObject) return 0;

    Geometry* pGeom = pObject->geometry();
    if (!pGeom) return 0;

    if (!_pNewEnv) _pNewEnv = new PointEnv;
    pGeom->rayIntersection(_pNewEnv,_wantedMask,origin,direction,_distance);

    //if ((_pNewEnv->mask & _checkMask) != _checkMask) return 0;
    //if (_pNewEnv->distance <= 0.0 || _pNewEnv->distance >= _distance) return 0;
    
    if (!(_pNewEnv->mask & ENV_HAVE_DISTANCE) ||
        _pNewEnv->distance <= 0.0 ||
        _pNewEnv->distance >= _distance) return 0;

    // now we have what we required and the intersection is closest so far
    if (_pEnv) delete _pEnv;
    _pEnv     = _pNewEnv;
    _pNewEnv  = NULL;
    _distance = _pEnv->distance;
    if (_wantedMask & ENV_WANT_ASOC_PRIMITIVE) {
        _pEnv->pVisitableObj = pObject; 
        _pEnv->mask |= ENV_HAVE_ASOC_PRIMITIVE; 
    }
    
    return 1; 
}

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