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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTexturedSphereSource.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 "vtkTexturedSphereSource.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkMath.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
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->Allocate(newPolys->EstimateSize(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] = 2.0 * theta/vtkMath::Pi();
for (j=0; j <= this->PhiResolution; j++)
{
phi = j * deltaPhi;
radius = this->Radius * sin((double)phi);
x[0] = radius * cos((double)theta);
x[1] = radius * sin((double)theta);
x[2] = this->Radius * cos((double)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 memeory
//
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";
}
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