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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPVRayCastPickingHelper.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.
=========================================================================*/
// .NAME vtkPVRayCastPickingHelper - helper class that used selection and ray
// casting to find the intersection point between the user picking point
// and the concreate cell underneath.
#include "vtkPVRayCastPickingHelper.h"
#include "vtkCell.h"
#include "vtkCompositeDataIterator.h"
#include "vtkCompositeDataSet.h"
#include "vtkDataObject.h"
#include "vtkDataSet.h"
#include "vtkMath.h"
#include "vtkMultiProcessController.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkPVExtractSelection.h"
#include "vtkPVRenderView.h"
#include "vtkSelection.h"
#include "vtkSmartPointer.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include <assert.h>
vtkStandardNewMacro(vtkPVRayCastPickingHelper);
vtkCxxSetObjectMacro(vtkPVRayCastPickingHelper, Input, vtkAlgorithm);
vtkCxxSetObjectMacro(vtkPVRayCastPickingHelper, Selection, vtkAlgorithm);
//----------------------------------------------------------------------------
vtkPVRayCastPickingHelper::vtkPVRayCastPickingHelper()
{
this->Selection = NULL;
this->Input = NULL;
this->SnapOnMeshPoint = false;
this->PointA[0] = this->PointA[1] = this->PointA[2] = 0.0;
this->PointB[0] = this->PointB[1] = this->PointB[2] = 0.0;
}
//----------------------------------------------------------------------------
vtkPVRayCastPickingHelper::~vtkPVRayCastPickingHelper()
{
this->SetSelection(NULL);
this->SetInput(NULL);
}
//----------------------------------------------------------------------------
void vtkPVRayCastPickingHelper::PrintSelf(ostream& os, vtkIndent indent)
{
Superclass::PrintSelf(os, indent);
os << indent << "PointA: "
<< this->PointA[0] << ", " << this->PointA[1] << ", " << this->PointA[2]
<< endl;
os << indent << "PointB: "
<< this->PointB[0] << ", " << this->PointB[1] << ", " << this->PointB[2]
<< endl;
os << indent << "SnapOnMeshPoint: "
<< this->SnapOnMeshPoint << endl;
os << indent << "Last Intersection: "
<< this->Intersection[0] << ", " << this->Intersection[1] << ", "
<< this->Intersection[2] << endl;
os << indent << "Input: "
<< (this->Input ? this->Input->GetClassName() : "NULL") << endl;
os << indent << "Selection: "
<< (this->Selection ? this->Selection->GetClassName() : "NULL") << endl;
}
//----------------------------------------------------------------------------
void vtkPVRayCastPickingHelper::ComputeIntersection()
{
assert("Need valid input" && this->Input && this->Selection);
assert("Need valid ray" && vtkMath::Distance2BetweenPoints(this->PointA, this->PointB));
// Reset the intersection value
this->Intersection[0] = this->Intersection[1] = this->Intersection[2] = 0.0;
// Manage multi-process distribution
vtkMultiProcessController* controller = vtkMultiProcessController::GetGlobalController();
int pid = controller->GetLocalProcessId();
int numberOfProcesses = controller->GetNumberOfProcesses();
vtkNew<vtkPVExtractSelection> extractSelectionFilter;
extractSelectionFilter->SetInputConnection(0,this->Input->GetOutputPort(0));
extractSelectionFilter->SetInputConnection(1,this->Selection->GetOutputPort(0));
extractSelectionFilter->UpdatePiece(pid, numberOfProcesses, 0);
vtkDataSet* ds = vtkDataSet::SafeDownCast(extractSelectionFilter->GetOutput());
vtkCompositeDataSet* cds =
vtkCompositeDataSet::SafeDownCast(extractSelectionFilter->GetOutput());
if(ds && ds->GetNumberOfCells() > 0)
{
this->ComputeIntersectionFromDataSet(ds);
}
else if(cds)
{
vtkSmartPointer<vtkCompositeDataIterator> dsIter;
dsIter.TakeReference(cds->NewIterator());
for(dsIter->GoToFirstItem();!dsIter->IsDoneWithTraversal();dsIter->GoToNextItem())
{
this->ComputeIntersectionFromDataSet(
vtkDataSet::SafeDownCast(dsIter->GetCurrentDataObject()));
}
}
// If distributed do a global reduction and make sure the root node get the
// right value. We don't care about the other nodes...
if(numberOfProcesses > 1)
{
double result[3];
controller->Reduce(this->Intersection, result, 3, vtkCommunicator::SUM_OP, 0);
this->Intersection[0] = result[0];
this->Intersection[1] = result[1];
this->Intersection[2] = result[2];
}
}
//----------------------------------------------------------------------------
void vtkPVRayCastPickingHelper::ComputeIntersectionFromDataSet(vtkDataSet* ds)
{
double tolerance = 0.1;
double t;
int subId;
double pcoord[3];
if(ds && ds->GetNumberOfCells() > 0)
{
if (this->SnapOnMeshPoint)
{
ds->GetPoint(0, this->Intersection);
}
else if(ds->GetCell(0)->IntersectWithLine(
this->PointA, this->PointB, tolerance, t, this->Intersection,
pcoord, subId) == 0 && t == VTK_DOUBLE_MAX)
{
vtkErrorMacro("The intersection was not properly found");
}
}
}
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