// ------------------------------------------------------------------------
void LoadImage(const std::string &filename, ImageType::Pointer &image)
{
typedef itk::Image<unsigned short, 4> InImageType;
typedef itk::ImageFileReader<InImageType> ReaderType;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(filename);
reader->SetImageIO(itk::NrrdImageIO::New());
reader->Update();
typedef itk::ExtractImageFilter<InImageType, ImageType> ExtractorType;
ExtractorType::Pointer extractor = ExtractorType::New();
extractor->SetInput(reader->GetOutput());
InImageType::RegionType exRegion = reader->GetOutput()->GetLargestPossibleRegion();
InImageType::SizeType exSize = exRegion.GetSize();
InImageType::IndexType exIndex = exRegion.GetIndex();
exSize[3] = 0;
exIndex[3] = 0;
exRegion.SetSize(exSize);
exRegion.SetIndex(exIndex);
extractor->SetExtractionRegion(exRegion);
extractor->SetDirectionCollapseToSubmatrix();
extractor->Update();
image = extractor->GetOutput();
}
int main(int argc, char *argv[])
{
if (argc != 2)
{
cerr << "Usage : " << argv[0] << " configFile" << endl;
return 0;
}
// By default (with no use of MPI) we are alone with id 0 (master)
int procNbr = 1;
int procId = 0;
/******************************************************************************/
#ifdef USE_MPI
cout << "Initializing MPI" << endl;
MPI_Init(NULL, NULL);
MPI_Comm_size(MPI_COMM_WORLD, &procNbr);
MPI_Comm_rank(MPI_COMM_WORLD, &procId);
#endif
/******************************************************************************/
cout << "Configuring code" << endl;
ConfigReader config(argv[1]);
if (!config.complete())
{
cerr << "Bad configuration file" << endl;
closeMpiIfUsed();
return 0;
}
ostringstream streamProcId;
streamProcId << procId;
string strProcId = streamProcId.str();
/******************************************************************************/
cout << "Reading and thresholding image" << endl;
// Read
ImageReader::Pointer reader = ImageReader::New();
reader->SetFileName(config.imgPath);
reader->Update();
// Set the ROI
InImageType::RegionType ROI = reader->GetOutput()->GetLargestPossibleRegion();
InImageType::RegionType::IndexType orig = ROI.GetIndex();
InImageType::RegionType::SizeType size = ROI.GetSize();
int cutDimension = config.cutDim;
if (cutDimension < 0 || cutDimension > 2)
{
if (size[2] > 1) // 3D input image
{
cutDimension = 2;
}
else
{
cutDimension = 1;
}
}
int wholeSize = size[cutDimension];
size[cutDimension] /= procNbr;
orig[cutDimension] = procId * size[cutDimension];
if (procId == procNbr - 1)
{
size[cutDimension] = wholeSize - orig[cutDimension];
}
ROI.SetIndex(orig);
ROI.SetSize(size);
reader->GetOutput()->SetRequestedRegion(ROI);
// Threshold
ThresholdFilter::Pointer threshold = ThresholdFilter::New();
threshold->SetInput(reader->GetOutput());
threshold->SetLowerThreshold(0);
threshold->SetUpperThreshold(config.thresholdValue);
threshold->SetInsideValue(pixmsh::FEFactory::PIXEL_BLACK);
threshold->SetOutsideValue(pixmsh::FEFactory::PIXEL_WHITE);
threshold->GetOutput()->SetRequestedRegion(ROI);
threshold->Update(); // Really perform the pre-process
/******************************************************************************/
cout << "Creating nodes and elements" << endl;
InIterator::RadiusType radius;
radius.Fill(1); // 3x3x3 centered region
BoundaryConditionType boundaryCondition;
boundaryCondition.SetConstant(pixmsh::FEFactory::PIXEL_NONE);
InIterator it(radius, threshold->GetOutput(),
threshold->GetOutput()->GetRequestedRegion());
it.OverrideBoundaryCondition(&boundaryCondition);
ios::openmode flags = ios::out | ios::trunc;
if (config.format == CFG_FORMAT_BIN)
{
flags |= ios::binary;
}
ofstream nodesFile((config.nodesPath + strProcId).c_str(), flags);
ofstream elementsFile((config.elementsPath + strProcId).c_str(), flags);
// Creation of the right type factory
pixmsh::FEFactory *factory = pixmsh::FEFactory::newFactory(config.elementsType,
nodesFile,
elementsFile);
// No factory constructed
if (factory == NULL)
{
cerr << "Factory can't be constructed" << endl;
closeMpiIfUsed();
return 0;
}
factory->setSize(threshold->GetOutput()->GetLargestPossibleRegion().GetSize()[0],
threshold->GetOutput()->GetLargestPossibleRegion().GetSize()[1],
threshold->GetOutput()->GetLargestPossibleRegion().GetSize()[2]);
factory->setOffset(config.offsetX, config.offsetY, config.offsetZ);
factory->setSpacing(config.spacingX, config.spacingY, config.spacingZ);
factory->setFlip(config.flipX, config.flipY, config.flipZ);
factory->setBinaryOutput(config.format == CFG_FORMAT_BIN ? true : false);
factory->setMaterials(config.materials == "both" || config.materials == "black",
config.materials == "both" || config.materials == "white");
factory->init();
// Iterate
std::vector<pixmsh::FEFactory::PixelValue> values(27);
for (it.GoToBegin(); !it.IsAtEnd(); ++it)
{
for (int i = 0; i < 27; ++i)
{
values[i] = static_cast<pixmsh::FEFactory::PixelValue>(it.GetPixel(i));
}
factory->addPixel(values,
it.GetIndex()[0],
it.GetIndex()[1],
it.GetIndex()[2]);
}
factory->endOutput();
int nodesNbr = factory->nodesNbr();
int elemNbr = factory->elementsNbr();
#ifdef USE_MPI
int nodesNbrTmp = factory->nodesNbr();
int elemNbrTmp = factory->elementsNbr();
MPI_Reduce(&nodesNbrTmp, &nodesNbr, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&elemNbrTmp, &elemNbr, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
#endif
/******************************************************************************/
if (procId == 0)
{
cout << "Writing final mesh file" << endl;
assembleFinalFile(config, procNbr, nodesNbr, elemNbr);
}
#ifdef USE_MPI
// Waiting for writing before deleting files
MPI_Barrier(MPI_COMM_WORLD);
#endif
/******************************************************************************/
cout << "Cleaning working space" << endl;
remove((config.nodesPath + strProcId).c_str());
remove((config.elementsPath + strProcId).c_str());
pixmsh::FEFactory::deleteFactory(factory);
factory = NULL;
/******************************************************************************/
closeMpiIfUsed();
/******************************************************************************/
cout << "Done" << endl;
return 0;
}