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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkTextureMapToSphere.h"
#include "vtkCellData.h"
#include "vtkDataSet.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkTextureMapToSphere);
// Create object with Center (0,0,0) and the PreventSeam ivar is set to true. The
// sphere center is automatically computed.
vtkTextureMapToSphere::vtkTextureMapToSphere()
{
this->Center[0] = this->Center[1] = this->Center[2] = 0.0;
this->AutomaticSphereGeneration = 1;
this->PreventSeam = 1;
}
int vtkTextureMapToSphere::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
// get the info objects
vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation* outInfo = outputVector->GetInformationObject(0);
// get the input and output
vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkDataSet* output = vtkDataSet::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));
if (!input || !output)
{
vtkErrorMacro(<< "Invalid input or output");
return 1;
}
vtkFloatArray* newTCoords;
vtkIdType numPts = input->GetNumberOfPoints();
vtkIdType ptId;
double x[3], rho, r, tc[2], phi = 0.0, thetaX, thetaY;
double diff, PiOverTwo = vtkMath::Pi() / 2.0;
vtkDebugMacro(<< "Generating Spherical Texture Coordinates");
// First, copy the input to the output as a starting point
output->CopyStructure(input);
if (numPts < 1)
{
// Needs to be called in case MPI is in use
this->ComputeCenter(input);
return 1;
}
this->ComputeCenter(input);
// loop over all points computing spherical coordinates. Only tricky part
// is keeping track of singularities/numerical problems.
newTCoords = vtkFloatArray::New();
newTCoords->SetName("Texture Coordinates");
newTCoords->SetNumberOfComponents(2);
newTCoords->SetNumberOfTuples(numPts);
for (ptId = 0; ptId < numPts; ptId++)
{
input->GetPoint(ptId, x);
rho = sqrt(vtkMath::Distance2BetweenPoints(x, this->Center));
if (rho != 0.0)
{
// watch for truncation problems
if (fabs((diff = x[2] - this->Center[2])) > rho)
{
phi = 0.0;
if (diff > 0.0)
{
tc[1] = 0.0;
}
else
{
tc[1] = 1.0;
}
}
else
{
phi = acos((diff / rho));
tc[1] = phi / vtkMath::Pi();
}
}
else
{
tc[1] = 0.0;
}
r = rho * sin(phi);
if (r != 0.0)
{
// watch for truncation problems
if (fabs((diff = x[0] - this->Center[0])) > r)
{
if (diff > 0.0)
{
thetaX = 0.0;
}
else
{
thetaX = vtkMath::Pi();
}
}
else
{
thetaX = acos(diff / r);
}
if (fabs((diff = x[1] - this->Center[1])) > r)
{
if (diff > 0.0)
{
thetaY = PiOverTwo;
}
else
{
thetaY = -PiOverTwo;
}
}
else
{
thetaY = asin(diff / r);
}
}
else
{
thetaX = thetaY = 0.0;
}
if (this->PreventSeam)
{
tc[0] = thetaX / vtkMath::Pi();
}
else
{
tc[0] = thetaX / (2.0 * vtkMath::Pi());
if (thetaY < 0.0)
{
tc[0] = 1.0 - tc[0];
}
}
newTCoords->SetTuple(ptId, tc);
}
output->GetPointData()->CopyTCoordsOff();
output->GetPointData()->PassData(input->GetPointData());
output->GetCellData()->PassData(input->GetCellData());
output->GetPointData()->SetTCoords(newTCoords);
newTCoords->Delete();
return 1;
}
void vtkTextureMapToSphere::ComputeCenter(vtkDataSet* dataSet)
{
if (this->AutomaticSphereGeneration)
{
double x[3];
vtkIdType numPts = dataSet->GetNumberOfPoints();
this->Center[0] = this->Center[1] = this->Center[2] = 0.0;
for (vtkIdType ptId = 0; ptId < numPts; ++ptId)
{
dataSet->GetPoint(ptId, x);
this->Center[0] += x[0];
this->Center[1] += x[1];
this->Center[2] += x[2];
}
this->Center[0] /= numPts;
this->Center[1] /= numPts;
this->Center[2] /= numPts;
vtkDebugMacro(<< "Center computed as: (" << this->Center[0] << ", " << this->Center[1] << ", "
<< this->Center[2] << ")");
}
}
void vtkTextureMapToSphere::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent
<< "Automatic Sphere Generation: " << (this->AutomaticSphereGeneration ? "On\n" : "Off\n");
os << indent << "Prevent Seam: " << (this->PreventSeam ? "On\n" : "Off\n");
os << indent << "Center: (" << this->Center[0] << ", " << this->Center[1] << ", "
<< this->Center[2] << ")\n";
}
VTK_ABI_NAMESPACE_END
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