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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkDistancePolyDataFilter.h"
#include "vtkCellData.h"
#include "vtkDoubleArray.h"
#include "vtkImplicitPolyDataDistance.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkSMPThreadLocalObject.h"
#include "vtkSMPTools.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkTriangle.h"
// The 3D cell with the maximum number of points is VTK_LAGRANGE_HEXAHEDRON.
// We support up to 6th order hexahedra.
#define VTK_MAXIMUM_NUMBER_OF_POINTS 216
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkDistancePolyDataFilter);
//------------------------------------------------------------------------------
vtkDistancePolyDataFilter::vtkDistancePolyDataFilter()
{
this->SignedDistance = 1;
this->NegateDistance = 0;
this->ComputeSecondDistance = 1;
this->ComputeCellCenterDistance = 1;
this->ComputeDirection = 0;
this->SetNumberOfInputPorts(2);
this->SetNumberOfOutputPorts(2);
}
//------------------------------------------------------------------------------
vtkDistancePolyDataFilter::~vtkDistancePolyDataFilter() = default;
//------------------------------------------------------------------------------
int vtkDistancePolyDataFilter::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
vtkPolyData* input0 = vtkPolyData::GetData(inputVector[0], 0);
vtkPolyData* input1 = vtkPolyData::GetData(inputVector[1], 0);
vtkPolyData* output0 = vtkPolyData::GetData(outputVector, 0);
vtkPolyData* output1 = vtkPolyData::GetData(outputVector, 1);
output0->CopyStructure(input0);
output0->GetPointData()->PassData(input0->GetPointData());
output0->GetCellData()->PassData(input0->GetCellData());
output0->BuildCells();
this->GetPolyDataDistance(output0, input1);
if (this->ComputeSecondDistance)
{
output1->CopyStructure(input1);
output1->GetPointData()->PassData(input1->GetPointData());
output1->GetCellData()->PassData(input1->GetCellData());
output1->BuildCells();
this->GetPolyDataDistance(output1, input0);
}
return 1;
}
//------------------------------------------------------------------------------
void vtkDistancePolyDataFilter::GetPolyDataDistance(vtkPolyData* mesh, vtkPolyData* src)
{
vtkDebugMacro(<< "Start vtkDistancePolyDataFilter::GetPolyDataDistance");
if (mesh->GetNumberOfCells() == 0 || mesh->GetNumberOfPoints() == 0)
{
vtkErrorMacro(<< "No points/cells to operate on");
return;
}
if (src->GetNumberOfPolys() == 0 || src->GetNumberOfPoints() == 0)
{
vtkErrorMacro(<< "No points/cells to difference from");
return;
}
vtkNew<vtkImplicitPolyDataDistance> imp;
imp->SetInput(src);
// Calculate distance from points.
const vtkIdType numPts = mesh->GetNumberOfPoints();
vtkNew<vtkDoubleArray> pointArray;
pointArray->SetName("Distance");
pointArray->SetNumberOfComponents(1);
pointArray->SetNumberOfTuples(numPts);
vtkNew<vtkDoubleArray> directionArray;
if (this->ComputeDirection)
{
directionArray->SetName("Direction");
directionArray->SetNumberOfComponents(3);
directionArray->SetNumberOfTuples(numPts);
}
auto DistanceWithSign = [&](const double& val)
{ return this->SignedDistance ? (this->NegateDistance ? -val : val) : std::abs(val); };
vtkSMPTools::For(0, numPts,
[&](vtkIdType begin, vtkIdType end)
{
double pt[3];
for (vtkIdType ptId = begin; ptId < end; ptId++)
{
mesh->GetPoint(ptId, pt);
if (this->ComputeDirection)
{
double closestPoint[3];
double direction[3];
double val = imp->EvaluateFunctionAndGetClosestPoint(pt, closestPoint);
double dist = DistanceWithSign(val);
vtkMath::Subtract(closestPoint, pt, direction);
vtkMath::Normalize(direction);
pointArray->SetValue(ptId, dist);
directionArray->SetTuple(ptId, direction);
}
else
{
double val = imp->EvaluateFunction(pt);
double dist = DistanceWithSign(val);
pointArray->SetValue(ptId, dist);
}
}
});
mesh->GetPointData()->AddArray(pointArray);
mesh->GetPointData()->SetActiveScalars("Distance");
if (this->ComputeDirection)
{
mesh->GetPointData()->AddArray(directionArray);
mesh->GetPointData()->SetActiveVectors("Direction");
}
// Calculate distance from cell centers.
if (this->ComputeCellCenterDistance)
{
const vtkIdType numCells = mesh->GetNumberOfCells();
vtkNew<vtkDoubleArray> cellArray;
cellArray->SetName("Distance");
cellArray->SetNumberOfComponents(1);
cellArray->SetNumberOfTuples(numCells);
vtkNew<vtkDoubleArray> cellDirectionArray;
cellDirectionArray->SetName("Direction");
if (this->ComputeDirection)
{
cellDirectionArray->SetNumberOfComponents(3);
cellDirectionArray->SetNumberOfTuples(numCells);
}
vtkSMPThreadLocalObject<vtkGenericCell> TLCell;
vtkSMPTools::For(0, numCells,
[&](vtkIdType begin, vtkIdType end)
{
auto cell = TLCell.Local();
int subId;
double pcoords[3], x[3], weights[VTK_MAXIMUM_NUMBER_OF_POINTS];
for (vtkIdType cellId = begin; cellId < end; cellId++)
{
mesh->GetCell(cellId, cell);
cell->GetParametricCenter(pcoords);
cell->EvaluateLocation(subId, pcoords, x, weights);
if (this->ComputeDirection)
{
double closestPoint[3];
double direction[3];
double val = imp->EvaluateFunctionAndGetClosestPoint(x, closestPoint);
double dist = DistanceWithSign(val);
vtkMath::Subtract(closestPoint, x, direction);
vtkMath::Normalize(direction);
cellArray->SetValue(cellId, dist);
cellDirectionArray->SetTuple(cellId, direction);
}
else
{
double val = imp->EvaluateFunction(x);
double dist = DistanceWithSign(val);
cellArray->SetValue(cellId, dist);
}
}
});
mesh->GetCellData()->AddArray(cellArray);
mesh->GetCellData()->SetActiveScalars("Distance");
if (this->ComputeDirection)
{
mesh->GetCellData()->AddArray(cellDirectionArray);
mesh->GetCellData()->SetActiveVectors("Direction");
}
}
vtkDebugMacro(<< "End vtkDistancePolyDataFilter::GetPolyDataDistance");
}
//------------------------------------------------------------------------------
vtkPolyData* vtkDistancePolyDataFilter::GetSecondDistanceOutput()
{
if (!this->ComputeSecondDistance)
{
return nullptr;
}
return vtkPolyData::SafeDownCast(this->GetOutputDataObject(1));
}
//------------------------------------------------------------------------------
void vtkDistancePolyDataFilter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "SignedDistance: " << this->SignedDistance << "\n";
os << indent << "NegateDistance: " << this->NegateDistance << "\n";
os << indent << "ComputeSecondDistance: " << this->ComputeSecondDistance << "\n";
os << indent << "ComputeCellCenterDistance: " << this->ComputeCellCenterDistance << "\n";
os << indent << "ComputeDirection: " << this->ComputeDirection << "\n";
}
VTK_ABI_NAMESPACE_END
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