bool AutoSegmentationTools::extractConnectedComponents(GenericIndexedCloudPersist* theCloud, ReferenceCloudContainer& cc)
{
unsigned numberOfPoints = (theCloud ? theCloud->size() : 0);
if (numberOfPoints == 0)
{
return false;
}
//components should have already been labeled and labels should have been stored in the active scalar field!
if (!theCloud->isScalarFieldEnabled())
{
return false;
}
//empty the input vector if necessary
while (!cc.empty())
{
delete cc.back();
cc.pop_back();
}
for (unsigned i = 0; i < numberOfPoints; ++i)
{
ScalarType slabel = theCloud->getPointScalarValue(i);
if (slabel >= 1) //labels start from 1! (this test rejects NaN values as well)
{
int ccLabel = static_cast<int>(theCloud->getPointScalarValue(i)) - 1;
//we fill the components vector with empty components until we reach the current label
//(they will be "used" later)
try
{
while (static_cast<size_t>(ccLabel) >= cc.size())
{
cc.push_back(new ReferenceCloud(theCloud));
}
}
catch (const std::bad_alloc&)
{
//not enough memory
cc.clear();
return false;
}
//add the point to the current component
if (!cc[ccLabel]->addPointIndex(i))
{
//not enough memory
while (!cc.empty())
{
delete cc.back();
cc.pop_back();
}
return false;
}
}
}
return true;
}
//extrait les composantes connexes d'un nuage
//--> version avec des ReferenceCloud (uniquement des références vers les points)
//pour permettre une récupération au niveau de l'application cliente
//des couleurs, normales, etc.
bool AutoSegmentationTools::extractConnectedComponents(GenericIndexedCloudPersist* theCloud, ReferenceCloudContainer& cc)
{
if (!theCloud)
return false;
unsigned numberOfPoints = theCloud->size();
if (numberOfPoints<1)
return false;
//on admet que "labelConnectedComponents" a bien déjà été appelé
//les labels des CCs sont alors stockées dans le champ scalaire "courant"
cc.clear();
//theCloud->placeIteratorAtBegining();
for (unsigned i=0;i<numberOfPoints;++i)
{
int ccLabel=(int)theCloud->getPointScalarValue(i)-1; //les labels commencent à 1 !
//on remplit le vecteur de "CCs" vides jusqu'à arriver au bon numéro de CC
//on s'occupera en théorie des autres plus tard
while (ccLabel>=(int)cc.size())
cc.push_back(new ReferenceCloud(theCloud));
//on rajoute le point à la CC courante
cc[ccLabel]->addPointIndex(i);
}
return true;
}
