DGtal 1.3.0
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Extracting 3D surface slice with DigitalSurfaceTracker.

See also
Tracking a 3D boundary to build a surface.
Extraction of 2 surface slice associated to one surfel.
#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/helpers/StdDefs.h"
#include "DGtal/topology/KhalimskySpaceND.h"
#include "DGtal/topology/SurfelAdjacency.h"
#include "DGtal/topology/DigitalSurface.h"
#include "DGtal/topology/SetOfSurfels.h"
#include "DGtal/topology/DigitalSurface2DSlice.h"
#include "DGtal/topology/helpers/Surfaces.h"
#include "DGtal/io/readers/VolReader.h"
#include "DGtal/io/DrawWithDisplay3DModifier.h"
#include "DGtal/io/viewers/Viewer3D.h"
#include "DGtal/images/ImageSelector.h"
#include "DGtal/images/imagesSetsUtils/SetFromImage.h"
#include "DGtal/io/Color.h"
#include "DGtal/io/colormaps/GradientColorMap.h"
#include "ConfigExamples.h"
using namespace std;
using namespace DGtal;
using namespace Z3i;
int main( int argc, char** argv )
// for 3D display with Viewer3D
QApplication application(argc,argv);
trace.beginBlock( "Reading vol file into an image." );
typedef ImageSelector < Domain, int>::Type Image;
std::string inputFilename = examplesPath + "samples/Al.100.vol";
Image image = VolReader<Image>::importVol(inputFilename);
DigitalSet set3d (image.domain());
0, 1 );
Viewer3D<> viewer;
trace.beginBlock( "Construct the Khalimsky space from the image domain." );
KSpace ks;
bool space_ok = ks.init( image.domain().lowerBound(),
image.domain().upperBound(), true );
if (!space_ok)
trace.error() << "Error in the Khamisky space construction."<<std::endl;
return 2;
typedef SurfelAdjacency<KSpace::dimension> MySurfelAdjacency;
MySurfelAdjacency surfAdj( true ); // interior in all directions.
trace.beginBlock( "Extracting boundary by scanning the space. " );
typedef KSpace::Surfel Surfel;
typedef KSpace::SurfelSet SurfelSet;
typedef SetOfSurfels< KSpace, SurfelSet > MySetOfSurfels;
MySetOfSurfels theSetOfSurfels( ks, surfAdj );
Surfaces<KSpace>::sMakeBoundary( theSetOfSurfels.surfelSet(),
ks, set3d,
image.domain().upperBound() );
MyDigitalSurface digSurf( theSetOfSurfels );
trace.info() << "Digital surface has " << digSurf.size() << " surfels."
<< std::endl;
trace.beginBlock( "Extract slices." );
typedef MyDigitalSurface::DigitalSurfaceTracker MyTracker;
//Extract an initial boundary cell
Surfel surf = *digSurf.begin();
MyTracker* tracker1 = digSurf.container().newTracker( surf );
MyTracker* tracker2 = digSurf.container().newTracker( surf );
// Extract the bondary contour associated to the initial surfel in
// its first direction
My2DSlice slice1( tracker1, *(ks.sDirs( surf )) );
// Extract the bondary contour associated to the initial surfel in
// its second direction
My2DSlice slice2( tracker2, *++(ks.sDirs( surf )) );
delete tracker1;
delete tracker2;
ASSERT( slice1.start() == slice1.begin() );
ASSERT( slice1.cstart() == slice1.c() );
ASSERT( *slice1.begin() == surf );
ASSERT( *slice1.c() == surf );
ASSERT( *slice1.start() == surf );
ASSERT( *slice1.cstart() == surf );
ASSERT( *slice1.rcstart() == surf );
ASSERT( slice1.rcstart() == slice1.rc() );
ASSERT( *slice1.rc() == surf );
ASSERT( *(slice1.c()+1) == *(slice1.begin()+1) );
ASSERT( *(slice1.rc()+1) == *(slice1.rbegin()) );
trace.beginBlock( "Display all with QGLViewer." );
// Displaying all the surfels in transparent mode
viewer << SetMode3D( surf.className(), "Transparent");
for( MyDigitalSurface::ConstIterator it = theSetOfSurfels.begin(),
it_end = theSetOfSurfels.end(); it != it_end; ++it )
viewer<< *it;
// Displaying First surfels cut with gradient colors.;
GradientColorMap<int> cmap_grad( 0, slice1.size() );
cmap_grad.addColor( Color( 50, 50, 255 ) );
cmap_grad.addColor( Color( 255, 0, 0 ) );
cmap_grad.addColor( Color( 255, 255, 10 ) );
// Need to avoid surfel superposition (the surfel size in increased)
viewer << Viewer3D<>::shiftSurfelVisu;
viewer << SetMode3D( surf.className(), "");
viewer.setFillColor(Color(180, 200, 25, 255));
int d=0;
for ( My2DSlice::ConstIterator it = slice1.begin(),
it_end = slice1.end(); it != it_end; ++it )
Color col= cmap_grad(d);
viewer.setFillColor(Color(col.red(),col.green() ,col.blue(), 255));
viewer<< *it;
GradientColorMap<int> cmap_grad2( 0, slice2.size() );
cmap_grad2.addColor( Color( 50, 50, 255 ) );
cmap_grad2.addColor( Color( 255, 0, 0 ) );
cmap_grad2.addColor( Color( 255, 255, 10 ) );
for ( My2DSlice::ConstIterator it = slice2.begin(),
it_end = slice2.end(); it != it_end; ++it )
Color col= cmap_grad2(d);
viewer.setFillColor(Color(col.red(),col.green() ,col.blue(), 255));
viewer<< *it;
// One need once again to avoid superposition.
viewer << Viewer3D<>::shiftSurfelVisu;
viewer.setFillColor(Color(18, 200, 25, 255));
viewer << surf ;
viewer << Viewer3D<>::updateDisplay;
return application.exec();
// //
Structure representing an RGB triple with alpha component.
Definition: Color.h:68
void green(const unsigned char aGreenValue)
void red(const unsigned char aRedValue)
void blue(const unsigned char aBlueValue)
Aim: Represents a 2-dimensional slice in a DigitalSurface. In a sense, it is a 4-connected contour,...
ConstIterator begin() const
Aim: Represents a set of n-1-cells in a nD space, together with adjacency relation between these cell...
virtual void setFillColor(DGtal::Color aColor)
Aim: This class template may be used to (linearly) convert scalar values in a given range into a colo...
void addColor(const Color &color)
Aim: A model of CDigitalSurfaceContainer which defines the digital surface as connected surfels....
Definition: SetOfSurfels.h:74
Aim: A utility class for constructing surfaces (i.e. set of (n-1)-cells).
Definition: Surfaces.h:79
Aim: Represent adjacencies between surfel elements, telling if it follows an interior to exterior ord...
void beginBlock(const std::string &keyword="")
std::ostream & error()
std::ostream & info()
double endBlock()
virtual void show()
Overload QWidget method in order to add a call to updateList() method (to ensure that the lists are w...
DigitalSurface< MyDigitalSurfaceContainer > MyDigitalSurface
MyDigitalSurface::SurfelSet SurfelSet
DGtal is the top-level namespace which contains all DGtal functions and types.
STL namespace.
Aim: Define utilities to convert a digital set into an image.
Definition: SetFromImage.h:64
Modifier class in a Display3D stream. Useful to choose your own mode for a given class....
Aim: implements methods to read a "Vol" file format.
Definition: VolReader.h:90
int main()
Definition: testBits.cpp:56
ImageContainerBySTLVector< Domain, Value > Image
Z2i::DigitalSet DigitalSet