[vtkusers] how to use SetSampleDistance

[Lacko]

hello. i'm new to vtk. i have a project about volume rendering and i want to
be able to change sample distance for dataset.  i understand that i should
use SetSampleDistance but i can't understand how to use it.

i would appreciate some help. here is my code:

#include "vtkSmartPointer.h"
#include "vtkSLCReader.h"
#include "vtkExtractVOI.h"
#include "vtkContourFilter.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkProperty.h"
#include "vtkOutlineFilter.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "pathconfig.h"
#include "vtkStructuredPointsReader.h"
#include "vtkLookupTable.h"
#include "vtkImageMapToColors.h"
#include "vtkImageAlgorithm.h"
#include "vtkProbeFilter.h"
#include "vtkVolumeRayCastMapper.h"
#include "vtkPolyDataPointSampler.h"
#include "vtkVolume.h"
#include "vtkVolumeRayCastIsosurfaceFunction.h"

#define VTK_CREATE(type ,name) vtkSmartPointer<type> name =
vtkSmartPointer<type>::New()

int main()
{
    filePathBuilder fpath;
    VTK_CREATE(vtkStructuredPointsReader, reader);
    reader->SetFileName(fpath.filePath("mummy.128.vtk"));

    VTK_CREATE(vtkLookupTable, lut_bone);
    lut_bone->SetNumberOfColors(256);
    lut_bone->SetTableRange(0, 255);
    lut_bone->SetHueRange(0,1);
    lut_bone->SetSaturationRange(0, 0);
    lut_bone->SetValueRange (0.0, 1.0);
    lut_bone->SetAlphaRange(1,1);
    lut_bone->Build();

    VTK_CREATE(vtkLookupTable, lut_skin);
    lut_skin->SetNumberOfColors(256);
    lut_skin->SetTableRange(0, 255);
    lut_skin->SetHueRange(0,0);
    lut_skin->SetSaturationRange(0, 1);
    lut_skin->SetValueRange (0.0, 1);
    lut_skin->SetAlphaRange(0.6, 0.6);//0,6
    lut_skin->Build();

    VTK_CREATE(vtkImageMapToColors, iMtc_bone);
    iMtc_bone->SetLookupTable(lut_bone);
    iMtc_bone->SetInputConnection(reader->GetOutputPort());

    VTK_CREATE(vtkImageMapToColors, iMtc_skin);
    iMtc_skin->SetLookupTable(lut_skin);
    iMtc_skin->SetInputConnection(reader->GetOutputPort());

    VTK_CREATE(vtkContourFilter, bone_filter);
    bone_filter->SetInputConnection(reader->GetOutputPort());
    bone_filter->SetNumberOfContours(1);
    bone_filter->SetValue(0,110.0);//110

    VTK_CREATE(vtkContourFilter, skin_filter);
    skin_filter->SetInputConnection(reader->GetOutputPort());
    skin_filter->SetNumberOfContours(1);
    skin_filter->SetValue(0,95.0);


    VTK_CREATE(vtkProbeFilter, probe_bone);
    probe_bone->SetInputConnection(bone_filter->GetOutputPort());
    probe_bone->SetSourceConnection(iMtc_bone->GetOutputPort());

    VTK_CREATE(vtkProbeFilter, probe_skin);
    probe_skin->SetInputConnection(skin_filter->GetOutputPort());
    probe_skin->SetSourceConnection(iMtc_skin->GetOutputPort());

    VTK_CREATE(vtkPolyDataMapper, skin_mapper);
    skin_mapper->SetInputConnection(skin_filter->GetOutputPort());
    skin_mapper->ScalarVisibilityOff();


    VTK_CREATE(vtkPolyDataMapper, bone_mapper);
    bone_mapper->SetInputConnection(probe_bone->GetOutputPort());
    bone_mapper->SetLookupTable(lut_bone);
    bone_mapper->SetColorModeToMapScalars();


    VTK_CREATE(vtkPolyDataMapper, skin_mapper);
    skin_mapper->SetInputConnection(probe_skin->GetOutputPort());
    skin_mapper->SetLookupTable(lut_skin);
    skin_mapper->SetColorModeToMapScalars();


    VTK_CREATE(vtkActor, bone_actor);
    bone_actor->SetMapper(bone_mapper);

    VTK_CREATE(vtkActor, skin_actor);
    skin_actor->SetMapper(skin_mapper);


    VTK_CREATE(vtkRenderer,ren);
     ren->AddActor(bone_actor);
     ren->AddActor(skin_actor);
    ren->SetBackground(0.2,0.2,0.2);


    VTK_CREATE(vtkRenderWindow,renw);
    renw->AddRenderer(ren);
    renw->SetSize(800,600);

    VTK_CREATE(vtkInteractorStyleTrackballCamera, style);
    VTK_CREATE(vtkRenderWindowInteractor, iren);
    iren->SetRenderWindow(renw);

    iren->SetInteractorStyle(style);

    iren->Initialize();
    iren->Start();
    return 0;
}





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