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| #include <vtkActor.h>
#include <vtkAppendPolyData.h>
#include <vtkCellArray.h>
#include <vtkMath.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkTransform.h>
#include <vtkTransformPolyDataFilter.h>
#include <vtkVoxelContoursToSurfaceFilter.h>
void CreateCircle(const double& z, const double& radius, const int& resolution, vtkPolyData* polyData);
int main(int, char *[])
{
// Create the data: a series of discs representing the intersections of x-y planes through a unit sphere
// centered at 0, 0, 0
//
int numDivisions = 20;
int resolution = 100;
double lastz = 0.;
double z = 0.;
double radius = 0.;
double sphereRadius = 1.;
double zmin = -0.9*sphereRadius;
double zmax = 0.9*sphereRadius;
// Append all the discs into one polydata
//
vtkSmartPointer<vtkAppendPolyData> appendFilter = vtkSmartPointer<vtkAppendPolyData>::New();
for( int i = 0; i <= numDivisions; ++i )
{
lastz = z;
double u = i / double(numDivisions);
z = ( 1. - u )*zmin + u*zmax;
radius = sqrt( sphereRadius*sphereRadius - z*z );
vtkSmartPointer<vtkPolyData> circle = vtkSmartPointer<vtkPolyData>::New();
CreateCircle( z, radius, resolution, circle );
#if VTK_MAJOR_VERSION <= 5
appendFilter->AddInput( circle );
#else
appendFilter->AddInputData( circle );
#endif
}
double deltaz = z - lastz;
if( !appendFilter->GetNumberOfInputConnections(0) )
{
cerr << "error, no contours!" << endl;
return EXIT_FAILURE;
}
appendFilter->Update();
// Convert to ijk coordinates for the contour to surface filter
//
double bounds[6];
vtkPolyData* contours = appendFilter->GetOutput();
contours->GetBounds( bounds );
double origin[3] = { bounds[0], bounds[2], bounds[4] };
double spacing[3] = { (bounds[1] - bounds[0]) / 40,
(bounds[3] - bounds[2]) / 40,
deltaz };
vtkSmartPointer<vtkPolyData> poly = vtkSmartPointer<vtkPolyData>::New();
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
vtkPoints* contourPoints = contours->GetPoints();
int numPoints = contourPoints->GetNumberOfPoints();
points->SetNumberOfPoints( numPoints );
for( int i = 0; i < numPoints; ++i )
{
double pt[3];
contourPoints->GetPoint( i, pt );
pt[0] = static_cast<int>( (pt[0] - origin[0]) / spacing[0] + 0.5 );
pt[1] = static_cast<int>( (pt[1] - origin[1]) / spacing[1] + 0.5 );
pt[2] = static_cast<int>( (pt[2] - origin[2]) / spacing[2] + 0.5 );
points->SetPoint( i, pt );
}
poly->SetPolys( contours->GetPolys() );
poly->SetPoints( points );
// Create the contour to surface filter
//
vtkSmartPointer<vtkVoxelContoursToSurfaceFilter> contoursToSurface = vtkSmartPointer<vtkVoxelContoursToSurfaceFilter>::New();
#if VTK_MAJOR_VERSION <= 5
contoursToSurface->SetInput( poly );
#else
contoursToSurface->SetInputData( poly );
#endif
contoursToSurface->SetSpacing( spacing[0], spacing[1], spacing[2] );
contoursToSurface->Update();
// Rescale the output back into world coordinates and center it
//
double scaleCenter[3];
contoursToSurface->GetOutput()->GetCenter( scaleCenter );
double scaleBounds[6];
contoursToSurface->GetOutput()->GetBounds( scaleBounds );
double center[3];
contours->GetCenter( center );
vtkSmartPointer<vtkTransformPolyDataFilter> transformFilter = vtkSmartPointer<vtkTransformPolyDataFilter>::New();
transformFilter->SetInputConnection( contoursToSurface->GetOutputPort() );
vtkSmartPointer<vtkTransform> transform = vtkSmartPointer<vtkTransform>::New();
transformFilter->SetTransform( transform );
transform->Translate( -scaleCenter[0], -scaleCenter[1], -scaleCenter[2] );
transform->Scale(
(bounds[1] - bounds[0])/(scaleBounds[1] - scaleBounds[0]),
(bounds[3] - bounds[2])/(scaleBounds[3] - scaleBounds[2]),
(bounds[5] - bounds[4])/(scaleBounds[5] - scaleBounds[4]) );
transform->Translate( center[0], center[1], center[2] );
// Visualize the contours
//
vtkSmartPointer<vtkPolyDataMapper> contoursMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
contoursMapper->SetInput( contours );
#else
contoursMapper->SetInputData( contours );
#endif
contoursMapper->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> contoursActor = vtkSmartPointer<vtkActor>::New();
contoursActor->SetMapper( contoursMapper );
contoursActor->GetProperty()->SetRepresentationToWireframe();
contoursActor->GetProperty()->ShadingOff();
// Visualize the surface
//
vtkSmartPointer<vtkPolyDataMapper> surfaceMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
surfaceMapper->SetInputConnection( transformFilter->GetOutputPort() );
surfaceMapper->ScalarVisibilityOff();
surfaceMapper->ImmediateModeRenderingOn();
vtkSmartPointer<vtkActor> surfaceActor = vtkSmartPointer<vtkActor>::New();
surfaceActor->SetMapper( surfaceMapper );
surfaceActor->GetProperty()->SetRepresentationToWireframe();
surfaceActor->GetProperty()->ShadingOff();
// Create two renderers side by side to show the contours and the surface separately
//
// Press 't' for trackball interaction
// Press 'r' to reset the camera
// Press 'w' for wireframe representation
// Press 's' for surface representation
//
vtkSmartPointer<vtkRenderer> renderer1 = vtkSmartPointer<vtkRenderer>::New();
renderer1->SetViewport( 0., 0., 0.5, 1. );
renderer1->SetBackground( 0.2, 0.2, 0.8 );
vtkSmartPointer<vtkRenderer> renderer2 = vtkSmartPointer<vtkRenderer>::New();
renderer2->SetViewport( 0.5, 0., 1., 1. );
renderer2->SetBackground( 0.8, 0.2, 0.2 );
vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize( 800, 400 );
renderWindow->AddRenderer( renderer1 );
renderWindow->AddRenderer( renderer2 );
vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow( renderWindow );
renderer1->AddViewProp( surfaceActor );
renderer2->AddViewProp( contoursActor );
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
void CreateCircle( const double& z, const double& radius, const int& resolution, vtkPolyData* polyData )
{
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
vtkSmartPointer<vtkCellArray> cells = vtkSmartPointer<vtkCellArray>::New();
points->SetNumberOfPoints( resolution );
cells->Allocate( 1, resolution );
cells->InsertNextCell( resolution );
for( int i = 0 ; i < resolution; ++i )
{
double theta = vtkMath::RadiansFromDegrees(360.*i/double(resolution));
double x = radius*cos(theta);
double y = radius*sin(theta);
points->SetPoint( i, x, y, z );
cells->InsertCellPoint( i );
}
polyData->Initialize();
polyData->SetPolys( cells );
polyData->SetPoints( points );
} |
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