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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTriangularTCoords.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 "vtkTriangularTCoords.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include <cmath>
vtkStandardNewMacro(vtkTriangularTCoords);
int vtkTriangularTCoords::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
vtkPolyData *input = vtkPolyData::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkPolyData *output = vtkPolyData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkIdType tmp;
int j;
vtkPoints *inPts;
vtkPointData *pd;
vtkCellArray *inPolys,*inStrips;
vtkIdType numNewPts, numNewPolys, polyAllocSize;
vtkFloatArray *newTCoords;
vtkIdType newId, numCells, cellId;
vtkIdType *pts = 0;
vtkIdType newIds[3];
vtkIdType npts = 0;;
int errorLogging = 1;
vtkPoints *newPoints;
vtkCellArray *newPolys;
double p1[3], p2[3], p3[3];
double tCoords[6];
vtkPointData *pointData = output->GetPointData();
// Initialize
//
vtkDebugMacro(<<"Generating triangular texture coordinates");
inPts = input->GetPoints();
pd = input->GetPointData();
inPolys = input->GetPolys();
inStrips = input->GetStrips();
// Count the number of new points and other primitives that
// need to be created.
//
numNewPts = input->GetNumberOfVerts();
numNewPolys = 0;
polyAllocSize = 0;
for (inPolys->InitTraversal(); inPolys->GetNextCell(npts,pts); )
{
numNewPts += npts;
numNewPolys++;
polyAllocSize += npts + 1;
}
for (inStrips->InitTraversal(); inStrips->GetNextCell(npts,pts); )
{
numNewPts += (npts-2) * 3;
polyAllocSize += (npts - 2) * 4;
}
numCells = inPolys->GetNumberOfCells() + inStrips->GetNumberOfCells();
// Allocate texture data
//
newTCoords = vtkFloatArray::New();
newTCoords->SetNumberOfComponents(2);
newTCoords->Allocate(2*numNewPts);
// Allocate
//
newPoints = vtkPoints::New();
newPoints->Allocate(numNewPts);
newPolys = vtkCellArray::New();
newPolys->Allocate(polyAllocSize);
pointData->CopyTCoordsOff();
pointData->CopyAllocate(pd);
// Texture coordinates are the same for each triangle
//
tCoords[0]= 0.0;
tCoords[1]= 0.0;
tCoords[2]= 1.0;
tCoords[3]= 0.0;
tCoords[4]= 0.5;
tCoords[5]= sqrt(3.0)/2.0;
int abort=0;
vtkIdType progressInterval=numCells/20 + 1;
for (cellId=0, inPolys->InitTraversal();
inPolys->GetNextCell(npts,pts) && !abort; cellId++)
{
if ( !(cellId % progressInterval) )
{
this->UpdateProgress((double)cellId/numCells);
abort = this->GetAbortExecute();
}
if (npts != 3)
{
if (errorLogging) vtkWarningMacro(
<< "No texture coordinates for this cell, it is not a triangle");
errorLogging = 0;
continue;
}
newPolys->InsertNextCell(npts);
for (j=0; j<npts; j++)
{
inPts->GetPoint(pts[j], p1);
newId = newPoints->InsertNextPoint(p1);
newPolys->InsertCellPoint(newId);
pointData->CopyData(pd,pts[j],newId);
newTCoords->InsertNextTuple (&tCoords[2*j]);
}
}
// Triangle strips
//
for (inStrips->InitTraversal();
inStrips->GetNextCell(npts,pts) && !abort; cellId++)
{
if ( !(cellId % progressInterval) )
{
this->UpdateProgress((double)cellId/numCells);
abort = this->GetAbortExecute();
}
for (j=0; j<(npts-2); j++)
{
inPts->GetPoint(pts[j], p1);
inPts->GetPoint(pts[j+1], p2);
inPts->GetPoint(pts[j+2], p3);
newIds[0] = newPoints->InsertNextPoint(p1);
pointData->CopyData(pd,pts[j],newIds[0]);
newTCoords->InsertNextTuple (&tCoords[0]);
newIds[1] = newPoints->InsertNextPoint(p2);
pointData->CopyData(pd,pts[j+1],newIds[1]);
newTCoords->InsertNextTuple (&tCoords[2]);
newIds[2] = newPoints->InsertNextPoint(p3);
pointData->CopyData(pd,pts[j+2],newIds[2]);
newTCoords->InsertNextTuple (&tCoords[4]);
// flip orientation for odd tris
if (j%2)
{
tmp = newIds[0];
newIds[0] = newIds[2];
newIds[2] = tmp;
}
newPolys->InsertNextCell(3,newIds);
}
}
// Update self and release memory
//
output->SetPoints(newPoints);
newPoints->Delete();
output->SetPolys(newPolys);
newPolys->Delete();
output->GetPointData()->SetTCoords(newTCoords);
newTCoords->Delete();
return 1;
}
void vtkTriangularTCoords::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
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