[vtkusers] vtkContourFilter and vtkElevationFilter for DTM

[AFANGNIKE]

Hi,

This is just a traduction of tcl example i found, it's work well (win Console
application).

// ***************************************************
vtkRenderer *renderer = vtkRenderer::New();
vtkRenderWindow *renWin = vtkRenderWindow::New();
		renWin->AddRenderer(renderer);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
		iren->SetRenderWindow(renWin);

vtkPolyDataReader *reader = vtkPolyDataReader::New() ;
		reader->SetFileName("C:\\Langage\\Bc3\\Bcprog\\Vtk\\vtk32\\vtk32\\Data\\dtm.vtk
) ;

vtkElevationFilter *elevation = vtkElevationFilter::New() ;
	elevation->SetInput(reader->GetOutput()) ;
	elevation->SetLowPoint(0,0,-100) ;
	elevation->SetHighPoint(0,0,700) ;
	elevation->SetScalarRange(0, 1000) ;

vtkLookupTable *lut = vtkLookupTable::New() ;
	lut->SetHueRange(0.6667, 0) ;
	lut->SetSaturationRange(1.0, 1.0) ;
	lut->SetValueRange(1.0, 1.0) ;
	lut->SetAlphaRange(1.0, 1.0) ;
	lut->SetNumberOfColors(256) ;
	lut->Build() ;

vtkContourFilter *iso = vtkContourFilter::New() ;
    iso->SetInput(elevation->GetOutput()) ;
    iso->GenerateValues(100, 0 , 1150) ;
// 100 and 1150 is relative to my dtm.vtk data : min and max altitude


vtkDataSetMapper *ugridMapper = vtkDataSetMapper::New();
        ugridMapper->SetInput(iso->GetOutput());
        ugridMapper->ImmediateModeRenderingOn();
	ugridMapper->SetScalarRange(0, 500) ;
	ugridMapper->SetLookupTable(lut) ;

vtkActor *ugridActor = vtkActor::New();
	ugridActor->SetMapper(ugridMapper);
	ugridActor->GetProperty()->SetColor(0,0,0);
	ugridActor->AddPosition(0,0.001,0);

vtkActor *wireActor = vtkActor::New();
	 wireActor->SetMapper(ugridMapper);
         wireActor->GetProperty()->SetRepresentationToWireframe();
	wireActor->GetProperty()->SetColor(0.5,0.5,0.5);

renderer->AddActor(ugridActor);
renderer->AddActor(wireActor);
renderer->SetBackground(0.4,0.4,0.4);

renWin->SetSize(600,600);

// interact with data
renWin->Render();
iren->Start();

renWin->SetFileName("Triangle.ppm") ;
renWin->SaveImageAsPPM() ;

// Clean up
renderer->Delete();
renWin->Delete();
iren->Delete();
ugrid->Delete();
ugridMapper->Delete();
ugridActor->Delete();

// ***************************************************

By By

Camille From Bordeaux
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