ObjsAheadExplorer.cc

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#include "esg/explorer/ObjsAheadExplorer.h"
#include <esg/iterator/IteratorSDS.h>

using namespace esg;

bool ObjsAheadExplorer::_explore(SceneGraphObject& obj)
{
    Transform* pTr = obj.transformation();

    if (pTr) { // new transformation => update stack
        Matrix4* auxMat = new Matrix4(pTr->get());
        if (!_trStack.empty()) auxMat->mul(*_trStack.top(), *auxMat);
        _trStack.push(auxMat);
        _rMat.set(*(pTr->getRotation()));
        _tVec = pTr->getTranslation();
        _sVec = pTr->getScale();
        ESG_INVERSE_TR_RAY(_rMat, *_tVec, *_sVec,
                           _origin, _trOrigin, _direction, _trDirection);
    }

    /*
     * Inspect subnodes and/or attributes
     */
    if (obj.hasSubnodes()) { // iterate
        _retVal = false;
        IteratorSDS* pIter = obj.traverseSubnodes();
        if (pIter) {
            pIter->initHalfSpaceSearch(_trOrigin, _trDirection);
            _pCandidate = pIter->firstChild();
            while (_pCandidate) {
                if (_explore(*_pCandidate)) _retVal = true;
                _pCandidate = pIter->nextChild();
            }
            delete pIter;
        }
    } else { // process_leaf
        Geometry * pGeom = obj.geometry();
        if (pGeom) {
            Interval ext = pGeom->extent(_trDirection);
#ifndef _MSC_VER
#warning "FIXME: Store transformed primitives"
#endif
            if (ext.max >= _originDist) _pResult->append(&obj);//POSSIBLE ERROR
            _retVal = true;
        } else
            _retVal = false;
    }

    /*
     * Erase my transform. matrix after backtracking children
     */
    if (pTr) {
        delete _trStack.top();
        _trStack.pop();
    }

    return _retVal;
}





ObjsAheadExplorer::ObjsAheadExplorer(const Vector3& origin,
                                     const Vector3& direction,
                                     Group *        pRepos)
    : RayIntExplorer(origin, direction, NULL)
{
    _pResult    = pRepos;
    _originDist = _origin.dot(_direction);
}

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