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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkTexturedSphereSource.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkTexturedSphereSource);
// Construct sphere with radius=0.5 and default resolution 8 in both Phi
// and Theta directions.
vtkTexturedSphereSource::vtkTexturedSphereSource(int res)
{
res = res < 4 ? 4 : res;
this->Radius = 0.5;
this->ThetaResolution = res;
this->PhiResolution = res;
this->Theta = 0.0;
this->Phi = 0.0;
this->OutputPointsPrecision = SINGLE_PRECISION;
this->SetNumberOfInputPorts(0);
}
int vtkTexturedSphereSource::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
// get the info object
vtkInformation* outInfo = outputVector->GetInformationObject(0);
// get the output
vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));
int i, j;
int numPts;
int numPolys;
vtkPoints* newPoints;
vtkFloatArray* newNormals;
vtkFloatArray* newTCoords;
vtkCellArray* newPolys;
double x[3], deltaPhi, deltaTheta, phi, theta, radius, norm;
vtkIdType pts[3];
double tc[2];
//
// Set things up; allocate memory
//
numPts = (this->PhiResolution + 1) * (this->ThetaResolution + 1);
// creating triangles
numPolys = this->PhiResolution * 2 * this->ThetaResolution;
newPoints = vtkPoints::New();
// Set the desired precision for the points in the output.
if (this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
{
newPoints->SetDataType(VTK_DOUBLE);
}
else
{
newPoints->SetDataType(VTK_FLOAT);
}
newPoints->Allocate(numPts);
newNormals = vtkFloatArray::New();
newNormals->SetNumberOfComponents(3);
newNormals->Allocate(3 * numPts);
newTCoords = vtkFloatArray::New();
newTCoords->SetNumberOfComponents(2);
newTCoords->Allocate(2 * numPts);
newPolys = vtkCellArray::New();
newPolys->AllocateEstimate(numPolys, 3);
//
// Create sphere
//
// Create intermediate points
deltaPhi = vtkMath::Pi() / this->PhiResolution;
deltaTheta = 2.0 * vtkMath::Pi() / this->ThetaResolution;
for (i = 0; i <= this->ThetaResolution; i++)
{
theta = i * deltaTheta;
tc[0] = theta / (2.0 * vtkMath::Pi());
for (j = 0; j <= this->PhiResolution; j++)
{
phi = j * deltaPhi;
radius = this->Radius * sin(phi);
x[0] = radius * cos(theta);
x[1] = radius * sin(theta);
x[2] = this->Radius * cos(phi);
newPoints->InsertNextPoint(x);
if ((norm = vtkMath::Norm(x)) == 0.0)
{
norm = 1.0;
}
x[0] /= norm;
x[1] /= norm;
x[2] /= norm;
newNormals->InsertNextTuple(x);
tc[1] = 1.0 - phi / vtkMath::Pi();
newTCoords->InsertNextTuple(tc);
}
}
//
// Generate mesh connectivity
//
// bands between poles
for (i = 0; i < this->ThetaResolution; i++)
{
for (j = 0; j < this->PhiResolution; j++)
{
pts[0] = (this->PhiResolution + 1) * i + j;
pts[1] = pts[0] + 1;
pts[2] = ((this->PhiResolution + 1) * (i + 1) + j) + 1;
newPolys->InsertNextCell(3, pts);
pts[1] = pts[2];
pts[2] = pts[1] - 1;
newPolys->InsertNextCell(3, pts);
}
}
//
// Update ourselves and release memory
//
output->SetPoints(newPoints);
newPoints->Delete();
output->GetPointData()->SetNormals(newNormals);
newNormals->Delete();
output->GetPointData()->SetTCoords(newTCoords);
newTCoords->Delete();
output->SetPolys(newPolys);
newPolys->Delete();
return 1;
}
void vtkTexturedSphereSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Theta Resolution: " << this->ThetaResolution << "\n";
os << indent << "Phi Resolution: " << this->PhiResolution << "\n";
os << indent << "Theta: " << this->Theta << "\n";
os << indent << "Phi: " << this->Phi << "\n";
os << indent << "Radius: " << this->Radius << "\n";
os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
VTK_ABI_NAMESPACE_END
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