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/*=========================================================================
Program: Visualization Toolkit
Module: FrustumClip.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkClipPolyData.h"
#include "vtkDebugLeaks.h"
#include "vtkPlanes.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
// Generate a sphere. Create a view frustum looking at the sphere
// Clip anything inside the frustum, then back away and view result
int FrustumClip( int argc, char *argv[] )
{
vtkRenderer *renderer = vtkRenderer::New();
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->AddRenderer(renderer);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
vtkSphereSource *sphere = vtkSphereSource::New();
sphere->SetThetaResolution(36);
sphere->SetPhiResolution(18);
sphere->SetRadius(1);
vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New();
sphereMapper->SetInputConnection( sphere->GetOutputPort());
vtkActor *sphereActor = vtkActor::New();
sphereActor->SetMapper(sphereMapper);
renderer->AddActor(sphereActor);
renderer->SetBackground(1,1,1);
renWin->SetSize(400,300);
vtkCamera *camera = renderer->GetActiveCamera();
camera->SetPosition(1.5, 0.0, 0.0);
renderer->ResetCameraClippingRange();
// Display once with camera in position 1
// Ensures clipping planes are initialized (camera matrix really).
renWin->Render();
// Now get the camera frustum and then move the camera away to see the
// clipped away stuff
double aspect=400.0/300.0, planeequations[24];
camera->GetFrustumPlanes(aspect, planeequations);
vtkPlanes *implictplanes = vtkPlanes::New();
// TODO cleanup
double ped[24];
int i;
for (i = 0; i < 24; ++i)
{
ped[i] = planeequations[i];
}
implictplanes->SetFrustumPlanes(ped);
vtkClipPolyData *clipper = vtkClipPolyData::New();
clipper->SetInputConnection(sphere->GetOutputPort());
clipper->SetClipFunction(implictplanes);
clipper->SetGenerateClipScalars(1);
clipper->SetInsideOut(0);
sphereMapper->SetInputConnection( clipper->GetOutputPort());
camera->SetPosition(-4.0, 0.25, 0.25);
renderer->ResetCameraClippingRange();
sphereActor->GetProperty()->SetColor(0.0,0.0,0.0);
renWin->Render();
int retVal = vtkRegressionTestImage( renWin );
if ( retVal == vtkRegressionTester::DO_INTERACTOR)
{
iren->Start();
}
// Clean up
renderer->Delete();
renWin->Delete();
iren->Delete();
sphere->Delete();
sphereMapper->Delete();
sphereActor->Delete();
implictplanes->Delete();
clipper->Delete();
return !retVal;
}
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