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/*=========================================================================
Program: Visualization Toolkit
Module: CellLocator.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 "vtkDataArray.h"
#include "vtkGenericCell.h"
#include "vtkPointData.h"
#include "vtkActor.h"
#include "vtkCellLocator.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkRegressionTestImage.h"
#include "vtkDebugLeaks.h"
int CellLocator( int argc, char *argv[] )
{
// kuhnan's sample code used to test
// vtkCellLocator::IntersectWithLine(...9 params...)
// sphere1: the outer sphere
vtkSphereSource *sphere1 = vtkSphereSource::New();
sphere1->SetThetaResolution(100);
sphere1->SetPhiResolution(100);
sphere1->SetRadius(1);
sphere1->Update();
// sphere2: the inner sphere
vtkSphereSource *sphere2 = vtkSphereSource::New();
sphere2->SetThetaResolution(100);
sphere2->SetPhiResolution(100);
sphere2->SetRadius(0.8);
sphere2->Update();
// the normals obtained from the outer sphere
vtkDataArray *sphereNormals = sphere1->GetOutput()->GetPointData()->GetNormals();
// the cell locator
vtkCellLocator* locator = vtkCellLocator::New();
locator->SetDataSet(sphere2->GetOutput());
locator->CacheCellBoundsOn();
locator->AutomaticOn();
locator->BuildLocator();
// init the counter and ray length
int numIntersected = 0;
double rayLen = 0.2000001; // = 1 - 0.8 + error tolerance
int sub_id;
vtkIdType cell_id;
double param_t, intersect[3], paraCoord[3];
double sourcePnt[3], destinPnt[3], normalVec[3];
vtkGenericCell *cell = vtkGenericCell::New();
// this loop traverses each point on the outer sphere (sphere1)
// and looks for an intersection on the inner sphere (sphere2)
for ( int i = 0; i < sphere1->GetOutput()->GetNumberOfPoints(); i ++ )
{
sphere1->GetOutput()->GetPoint(i, sourcePnt);
sphereNormals->GetTuple(i, normalVec);
// cast a ray in the negative direction toward sphere1
destinPnt[0] = sourcePnt[0] - rayLen * normalVec[0];
destinPnt[1] = sourcePnt[1] - rayLen * normalVec[1];
destinPnt[2] = sourcePnt[2] - rayLen * normalVec[2];
if ( locator->IntersectWithLine(sourcePnt, destinPnt, 0.0010, param_t,
intersect, paraCoord, sub_id, cell_id, cell) )
numIntersected ++;
}
if ( numIntersected != 9802 )
{
int numMissed = 9802 - numIntersected;
cerr << "ERROR: " << numMissed << " ray-sphere intersections missed!!!" << endl;
cerr << "If on a non-WinTel32 platform, try rayLen = 0.200001 or 0.20001 for a new test." << endl;
return 1;
}
else
cout << "Passed: a total of 9802 ray-sphere intersections detected." << endl;
sphereNormals = NULL;
cell->Delete();
sphere1->Delete();
sphere2->Delete();
locator->Delete();
// below: the initial tests
vtkRenderer *renderer = vtkRenderer::New();
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->AddRenderer(renderer);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
vtkSphereSource *sphere = vtkSphereSource::New();
sphere->SetThetaResolution(8); sphere->SetPhiResolution(8);
sphere->SetRadius(1.0);
sphere->Update();
vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New();
sphereMapper->SetInputConnection(sphere->GetOutputPort());
vtkActor *sphereActor = vtkActor::New();
sphereActor->SetMapper(sphereMapper);
vtkSphereSource *spot = vtkSphereSource::New();
spot->SetPhiResolution(6);
spot->SetThetaResolution(6);
spot->SetRadius(0.1);
vtkPolyDataMapper *spotMapper = vtkPolyDataMapper::New();
spotMapper->SetInputConnection(spot->GetOutputPort());
// Build a locator
vtkCellLocator *cellLocator = vtkCellLocator::New();
cellLocator->SetDataSet(sphere->GetOutput());
cellLocator->BuildLocator();
// Intersect with line
double p1[] = {2.0, 1.0, 3.0};
double p2[] = {0.0, 0.0, 0.0};
double t;
double ptline[3], pcoords[3];
int subId;
cellLocator->IntersectWithLine(p1, p2, 0.001, t, ptline, pcoords, subId);
vtkActor *intersectLineActor = vtkActor::New();
intersectLineActor->SetMapper(spotMapper);
intersectLineActor->SetPosition(ptline[0],ptline[1],ptline[2]);
intersectLineActor->GetProperty()->SetColor(1.0, 0.0, 0.0);
// Find closest point
vtkIdType cellId;
double dist;
p1[0] = -2.4; p1[1] = -0.9;
cellLocator->FindClosestPoint(p1, ptline, cellId, subId, dist);
vtkActor *closestPointActor = vtkActor::New();
closestPointActor->SetMapper(spotMapper);
closestPointActor->SetPosition(ptline[0],ptline[1],ptline[2]);
closestPointActor->GetProperty()->SetColor(0.0, 1.0, 0.0);
// Find closest point within radius
float radius = 5.0;
p1[0] = .2; p1[1] = 1.0; p1[2] = 1.0;
cellLocator->FindClosestPointWithinRadius(p1, radius, ptline, cellId, subId, dist);
vtkActor *closestPointActor2 = vtkActor::New();
closestPointActor2->SetMapper(spotMapper);
closestPointActor2->SetPosition(ptline[0],ptline[1],ptline[2]);
closestPointActor2->GetProperty()->SetColor(0.0, 1.0, 0.0);
renderer->AddActor(sphereActor);
renderer->AddActor(intersectLineActor);
renderer->AddActor(closestPointActor);
renderer->AddActor(closestPointActor2);
renderer->SetBackground(1,1,1);
renWin->SetSize(300,300);
// interact with data
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();
spot->Delete();
spotMapper->Delete();
intersectLineActor->Delete();
closestPointActor->Delete();
closestPointActor2->Delete();
cellLocator->FreeSearchStructure();
cellLocator->Delete();
return !retVal;
}
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