/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkFieldDataToAttributeDataFilter.cxx,v $

  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 "vtkFieldDataToAttributeDataFilter.h"

#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkDataSet.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkCxxRevisionMacro(vtkFieldDataToAttributeDataFilter, "$Revision: 1.39 $");
vtkStandardNewMacro(vtkFieldDataToAttributeDataFilter);

// Instantiate object with no input and no defined output.
vtkFieldDataToAttributeDataFilter::vtkFieldDataToAttributeDataFilter()
{
  int i;
   
  this->InputField = VTK_DATA_OBJECT_FIELD;
  this->OutputAttributeData = VTK_POINT_DATA;
  this->DefaultNormalize = 0;

  this->NumberOfScalarComponents = 0;
  for (i=0; i < 4; i++)
    {
    this->ScalarArrays[i] = NULL;
    this->ScalarArrayComponents[i] = -1; //uninitialized
    this->ScalarComponentRange[i][0] = this->ScalarComponentRange[i][1] = -1;
    this->ScalarNormalize[i] = 1; //yes, normalize
    }
  
  for (i=0; i < 3; i++)
    {
    this->VectorArrays[i] = NULL;
    this->VectorArrayComponents[i] = -1; //uninitialized
    this->VectorComponentRange[i][0] = this->VectorComponentRange[i][1] = -1;
    this->VectorNormalize[i] = 1; //yes, normalize
    }

  for (i=0; i < 3; i++)
    {
    this->NormalArrays[i] = NULL;
    this->NormalArrayComponents[i] = -1; //uninitialized
    this->NormalComponentRange[i][0] = this->NormalComponentRange[i][1] = -1;
    this->NormalNormalize[i] = 1; //yes, normalize
    }

  this->NumberOfTCoordComponents = 0;
  for (i=0; i < 3; i++)
    {
    this->TCoordArrays[i] = NULL;
    this->TCoordArrayComponents[i] = -1; //uninitialized
    this->TCoordComponentRange[i][0] = this->TCoordComponentRange[i][1] = -1;
    this->TCoordNormalize[i] = 1; //yes, normalize
    }

  for (i=0; i < 9; i++)
    {
    this->TensorArrays[i] = NULL;
    this->TensorArrayComponents[i] = -1; //uninitialized
    this->TensorComponentRange[i][0] = this->TensorComponentRange[i][1] = -1;
    this->TensorNormalize[i] = 1; //yes, normalize
    }
}

vtkFieldDataToAttributeDataFilter::~vtkFieldDataToAttributeDataFilter()
{
  int i;

  for (i=0; i<4; i++)
    {
    if ( this->ScalarArrays[i] != NULL )
      {
      delete [] this->ScalarArrays[i];
      }
    }
  
  for (i=0; i<3; i++)
    {
    if ( this->VectorArrays[i] != NULL )
      {
      delete [] this->VectorArrays[i];
      }
    }
  
  for (i=0; i<3; i++)
    {
    if ( this->NormalArrays[i] != NULL )
      {
      delete [] this->NormalArrays[i];
      }
    }
  
  for (i=0; i<3; i++)
    {
    if ( this->TCoordArrays[i] != NULL )
      {
      delete [] this->TCoordArrays[i];
      }
    }
  
  for (i=0; i<9; i++)
    {
    if ( this->TensorArrays[i] != NULL )
      {
      delete [] this->TensorArrays[i];
      }
    }
  
}

// Stuff related to filter interface------------------------------------------
//
int vtkFieldDataToAttributeDataFilter::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 ouptut
  vtkDataSet *input = vtkDataSet::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataSet *output = vtkDataSet::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkIdType num;
  vtkDataSetAttributes *attr;
  vtkFieldData *fd;
  vtkDebugMacro(<<"Generating attribute data from field data");

  // First, copy the input to the output as a starting point
  output->CopyStructure( input );

  // Pass here so that the attributes/fields can be over-written later
  output->GetPointData()->PassData(input->GetPointData());
  output->GetCellData()->PassData(input->GetCellData());

  if ( this->OutputAttributeData == VTK_CELL_DATA )
    {
    attr = output->GetCellData();
    num = input->GetNumberOfCells();
    }
  else
    {
    attr = output->GetPointData();
    num = input->GetNumberOfPoints();
    }
    
  if ( num < 1 )
    {
    vtkDebugMacro(<<"No input points/cells to create attribute data for");
    return 1;
    }

  fd = NULL;
  if ( this->InputField == VTK_DATA_OBJECT_FIELD )
    {
    fd = input->GetFieldData();
    }
  else if ( this->InputField == VTK_POINT_DATA_FIELD )
    {
    fd = input->GetPointData();
    }
  else if ( this->InputField == VTK_CELL_DATA_FIELD )
    {
    fd = input->GetCellData();
    }
  if ( fd == NULL )
    {
    vtkErrorMacro(<<"No field data available");
    return 1;
    }

  this->ConstructScalars(num, fd, attr, this->ScalarComponentRange,
                         this->ScalarArrays, this->ScalarArrayComponents, 
                         this->ScalarNormalize,this->NumberOfScalarComponents);
  this->ConstructVectors(num, fd, attr, this->VectorComponentRange,
                         this->VectorArrays, this->VectorArrayComponents, 
                         this->VectorNormalize);
  this->ConstructTensors(num, fd, attr, this->TensorComponentRange,
                         this->TensorArrays, this->TensorArrayComponents,
                         this->TensorNormalize);
  this->ConstructTCoords(num, fd, attr, this->TCoordComponentRange,
                         this->TCoordArrays, this->TCoordArrayComponents,
                         this->TCoordNormalize,this->NumberOfTCoordComponents);
  this->ConstructNormals(num, fd, attr, this->NormalComponentRange,
                         this->NormalArrays, this->NormalArrayComponents, 
                         this->NormalNormalize);
  this->ConstructFieldData(num, attr);

  return 1;
}

void vtkFieldDataToAttributeDataFilter::PrintSelf(ostream& os, 
                                                  vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "Input Field: ";
  if ( this->InputField == VTK_DATA_OBJECT_FIELD )
    {
    os << "DataObjectField\n";
    }
  else if ( this->InputField == VTK_POINT_DATA_FIELD )
    {
    os << "PointDataField\n";
    }
  else //if ( this->InputField == VTK_CELL_DATA_FIELD )
    {
    os << "CellDataField\n";
    }

  os << indent << "Default Normalize: " 
     << (this->DefaultNormalize ? "On\n" : "Off\n");

  os << indent << "Output Attribute Data: ";
  if ( this->OutputAttributeData == VTK_CELL_DATA )
    {
    os << "CellData\n";
    }
  else //if ( this->OutputAttributeData == VTK_POINT_DATA )
    {
    os << "PointData\n";
    }
}

// Stuff related to scalars --------------------------------------------
//
void vtkFieldDataToAttributeDataFilter::SetScalarComponent(int comp, const char *arrayName, 
                              int arrayComp, int min, int max, int normalize)
{
  if ( comp < 0 || comp > 3 )
    {
    vtkErrorMacro(<<"Scalar component must be between (0,3)");
    return;
    }
  
  if ( comp >= this->NumberOfScalarComponents ) 
    {
    this->NumberOfScalarComponents = comp + 1;
    }
  this->SetArrayName(this, this->ScalarArrays[comp], arrayName);
  if ( this->ScalarArrayComponents[comp] != arrayComp )
    {
    this->ScalarArrayComponents[comp] = arrayComp;
    this->Modified();
    }
  if ( this->ScalarComponentRange[comp][0] != min )
    {
    this->ScalarComponentRange[comp][0] = min;
    this->Modified();
    }
  if ( this->ScalarComponentRange[comp][1] != max )
    {
    this->ScalarComponentRange[comp][1] = max;
    this->Modified();
    }
  if ( this->ScalarNormalize[comp] != normalize )
    {
    this->ScalarNormalize[comp] = normalize;  
    this->Modified();
    }
}

const char *vtkFieldDataToAttributeDataFilter::GetScalarComponentArrayName(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 3 ? 3 : comp));
  return this->ScalarArrays[comp];
}

int vtkFieldDataToAttributeDataFilter::GetScalarComponentArrayComponent(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 3 ? 3 : comp));
  return this->ScalarArrayComponents[comp];
}

int vtkFieldDataToAttributeDataFilter::GetScalarComponentMinRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 3 ? 3 : comp));
  return this->ScalarComponentRange[comp][0];
}

int vtkFieldDataToAttributeDataFilter::GetScalarComponentMaxRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 3 ? 3 : comp));
  return this->ScalarComponentRange[comp][1];
}

int vtkFieldDataToAttributeDataFilter::GetScalarComponentNormalizeFlag(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 3 ? 3 : comp));
  return this->ScalarNormalize[comp];
}

void vtkFieldDataToAttributeDataFilter::ConstructScalars(int num, vtkFieldData *fd, 
                                                         vtkDataSetAttributes *attr,
                                                         vtkIdType componentRange[4][2],
                                                         char *arrays[4], int arrayComp[4],
                                                         int normalize[4], int numComp)
{
  int i, normalizeAny, updated=0;
  vtkDataArray *fieldArray[4];
  
  if ( numComp < 1 )
    {
    return;
    }
  for (i=0; i<numComp; i++)
    {
    if ( arrays[i] == NULL )
      {
      return;
      }
    }
  
  for ( i=0; i < numComp; i++ )
    {
    fieldArray[i] = this->GetFieldArray(fd, arrays[i], arrayComp[i]);

    if ( fieldArray[i] == NULL )
      {
      vtkErrorMacro(<<"Can't find array/component requested");
      return;
      }
    }
  
  for (normalizeAny=i=0; i < numComp; i++)
    {
    updated |= this->UpdateComponentRange(fieldArray[i], componentRange[i]);
    if ( num != (componentRange[i][1] - componentRange[i][0] + 1) )
      {
      vtkErrorMacro(<<"Number of scalars not consistent");
      return;
      }
    normalizeAny |= normalize[i];
    }
  
  vtkDataArray *newScalars;
  for (i=1; i < numComp; i++) //see whether all the data is from the same array
    {
    if ( fieldArray[i] != fieldArray[i-1] )
      {
      break;
      }
    }
  
  // see whether we can reuse the data array from the field
  if ( i >= numComp && fieldArray[0]->GetNumberOfComponents() == numComp && 
       fieldArray[0]->GetNumberOfTuples() == num && !normalizeAny )
    {
    newScalars = fieldArray[0];
    newScalars->Register(0);
    }
  else //have to copy data into created array
    {
    newScalars = vtkDataArray::CreateDataArray(this->GetComponentsType(numComp,
                                                                       fieldArray));
    newScalars->SetNumberOfTuples(num);
  
    for ( i=0; i < numComp; i++ )
      {
      if ( this->ConstructArray(newScalars, i, fieldArray[i], arrayComp[i],
                                componentRange[i][0], componentRange[i][1],
                                normalize[i]) == 0 )
        {
        newScalars->Delete();
        return;
        }
      }
    }
  
  attr->SetScalars(newScalars);
  newScalars->Delete();
  if ( updated ) //reset for next execution pass
    {
    for (i=0; i < numComp; i++)
      {
      componentRange[i][0] = componentRange[i][1] = -1;
      }
    }
}

// Stuff related to vectors --------------------------------------------
//
void vtkFieldDataToAttributeDataFilter::SetVectorComponent(int comp, const char *arrayName, 
                              int arrayComp, int min, int max, int normalize)
{
  if ( comp < 0 || comp > 2 )
    {
    vtkErrorMacro(<<"Vector component must be between (0,2)");
    return;
    }
  
  this->SetArrayName(this, this->VectorArrays[comp], arrayName);
  if ( this->VectorArrayComponents[comp] != arrayComp )
    {
    this->VectorArrayComponents[comp] = arrayComp;
    this->Modified();
    }
  if ( this->VectorComponentRange[comp][0] != min )
    {
    this->VectorComponentRange[comp][0] = min;
    this->Modified();
    }
  if ( this->VectorComponentRange[comp][1] != max )
    {
    this->VectorComponentRange[comp][1] = max;
    this->Modified();
    }
  if ( this->VectorNormalize[comp] != normalize )
    {
    this->VectorNormalize[comp] = normalize;  
    this->Modified();
    }
}

const char *vtkFieldDataToAttributeDataFilter::GetVectorComponentArrayName(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->VectorArrays[comp];
}

int vtkFieldDataToAttributeDataFilter::GetVectorComponentArrayComponent(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->VectorArrayComponents[comp];
}

int vtkFieldDataToAttributeDataFilter::GetVectorComponentMinRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->VectorComponentRange[comp][0];
}

int vtkFieldDataToAttributeDataFilter::GetVectorComponentMaxRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->VectorComponentRange[comp][1];
}

int vtkFieldDataToAttributeDataFilter::GetVectorComponentNormalizeFlag(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->VectorNormalize[comp];
}

void vtkFieldDataToAttributeDataFilter::ConstructVectors(int num, vtkFieldData *fd, 
                                                         vtkDataSetAttributes *attr,
                                                         vtkIdType componentRange[3][2], 
                                                         char *arrays[3],
                                                         int arrayComp[3], int normalize[3])
{
  int i, updated;
  vtkDataArray *fieldArray[3];

  for (i=0; i<3; i++)
    {
    if ( arrays[i] == NULL )
      {
      return;
      }
    }

  for ( i=0; i < 3; i++ )
    {
    fieldArray[i] = this->GetFieldArray(fd, arrays[i], arrayComp[i]);

    if ( fieldArray[i] == NULL )
      {
      vtkErrorMacro(<<"Can't find array requested");
      return;
      }
    }
  
  updated = this->UpdateComponentRange(fieldArray[0], componentRange[0]);
  updated |= this->UpdateComponentRange(fieldArray[1], componentRange[1]);
  updated |= this->UpdateComponentRange(fieldArray[2], componentRange[2]);

  if ( num != (componentRange[0][1] - componentRange[0][0] + 1) ||
       num != (componentRange[1][1] - componentRange[1][0] + 1) ||
       num != (componentRange[2][1] - componentRange[2][0] + 1) )
    {
    vtkErrorMacro(<<"Number of vectors not consistent");
    return;
    }
  
  vtkDataArray *newVectors;
  if ( fieldArray[0]->GetNumberOfComponents() == 3 && 
       fieldArray[0] == fieldArray[1] && fieldArray[1] == fieldArray[2] &&
       fieldArray[0]->GetNumberOfTuples() == num &&
       !normalize[0] && !normalize[1] && !normalize[2] )
    {
    newVectors = fieldArray[0];
    newVectors->Register(0);
    }
  else //have to copy data into created array
    {
    newVectors = vtkDataArray::CreateDataArray(this->GetComponentsType(3,fieldArray));
    newVectors->SetNumberOfComponents(3);
    newVectors->SetNumberOfTuples(num);

    for ( i=0; i < 3; i++ )
      {
      if ( this->ConstructArray(newVectors, i, fieldArray[i], arrayComp[i],
                                componentRange[i][0], componentRange[i][1],
                                normalize[i]) == 0 )
        {
        newVectors->Delete();
        return;
        }
      }
    }
  
  attr->SetVectors(newVectors);
  newVectors->Delete();
  if ( updated ) //reset for next execution pass
    {
    for (i=0; i < 3; i++)
      {
      componentRange[i][0] = componentRange[i][1] = -1;
      }
    }
}


// Stuff related to normals --------------------------------------------
//
void vtkFieldDataToAttributeDataFilter::SetNormalComponent(int comp, const char *arrayName, 
                              int arrayComp, int min, int max, int normalize)
{
  if ( comp < 0 || comp > 2 )
    {
    vtkErrorMacro(<<"Normal component must be between (0,2)");
    return;
    }
  
  this->SetArrayName(this, this->NormalArrays[comp], arrayName);
  if ( this->NormalArrayComponents[comp] != arrayComp )
    {
    this->NormalArrayComponents[comp] = arrayComp;
    this->Modified();
    }
  if ( this->NormalComponentRange[comp][0] != min )
    {
    this->NormalComponentRange[comp][0] = min;
    this->Modified();
    }
  if ( this->NormalComponentRange[comp][1] != max )
    {
    this->NormalComponentRange[comp][1] = max;
    this->Modified();
    }
  if ( this->NormalNormalize[comp] != normalize )
    {
    this->NormalNormalize[comp] = normalize;  
    this->Modified();
    }
}

const char *vtkFieldDataToAttributeDataFilter::GetNormalComponentArrayName(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->NormalArrays[comp];
}

int vtkFieldDataToAttributeDataFilter::GetNormalComponentArrayComponent(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->NormalArrayComponents[comp];
}

int vtkFieldDataToAttributeDataFilter::GetNormalComponentMinRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->NormalComponentRange[comp][0];
}

int vtkFieldDataToAttributeDataFilter::GetNormalComponentMaxRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->NormalComponentRange[comp][1];
}

int vtkFieldDataToAttributeDataFilter::GetNormalComponentNormalizeFlag(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->NormalNormalize[comp];
}

void vtkFieldDataToAttributeDataFilter::ConstructNormals(int num, vtkFieldData *fd, 
                                                         vtkDataSetAttributes *attr,
                                                         vtkIdType componentRange[3][2], 
                                                         char *arrays[3], int arrayComp[3], 
                                                         int normalize[3])
{
  int i, updated;
  vtkDataArray *fieldArray[3];

  for (i=0; i<3; i++)
    {
    if ( arrays[i] == NULL )
      {
      return;
      }
    }
  
  for ( i=0; i < 3; i++ )
    {
    fieldArray[i] = this->GetFieldArray(fd, arrays[i], arrayComp[i]);

    if ( fieldArray[i] == NULL )
      {
      vtkErrorMacro(<<"Can't find array requested");
      return;
      }
    }
  
  updated = this->UpdateComponentRange(fieldArray[0], componentRange[0]);
  updated |= this->UpdateComponentRange(fieldArray[1], componentRange[1]);
  updated |= this->UpdateComponentRange(fieldArray[2], componentRange[2]);

  if ( num != (componentRange[0][1] - componentRange[0][0] + 1) ||
       num != (componentRange[1][1] - componentRange[1][0] + 1) ||
       num != (componentRange[2][1] - componentRange[2][0] + 1) )
    {
    vtkErrorMacro(<<"Number of normals not consistent");
    return;
    }

  vtkDataArray *newNormals;
  if ( fieldArray[0]->GetNumberOfComponents() == 3 && 
       fieldArray[0] == fieldArray[1] && fieldArray[1] == fieldArray[2] &&
       fieldArray[0]->GetNumberOfTuples() == num &&
       !normalize[0] && !normalize[1] && !normalize[2] )
    {
    newNormals = fieldArray[0];
    newNormals->Register(0);
    }
  else //have to copy data into created array
    {
    newNormals = vtkDataArray::CreateDataArray(this->GetComponentsType(3, fieldArray));
    newNormals->SetNumberOfComponents(3);
    newNormals->SetNumberOfTuples(num);

    for ( i=0; i < 3; i++ )
      {
      if ( this->ConstructArray(newNormals, i, fieldArray[i], arrayComp[i],
                                componentRange[i][0], componentRange[i][1],
                                normalize[i]) == 0 )
        {
        newNormals->Delete();
        return;
        }
      }
    }
  
  attr->SetNormals(newNormals);
  newNormals->Delete();
  if ( updated ) //reset for next execution pass
    {
    for (i=0; i < 3; i++)
      {
      componentRange[i][0] = componentRange[i][1] = -1;
      }
    }
}

// Stuff related to texture coords --------------------------------------------
//
void vtkFieldDataToAttributeDataFilter::SetTCoordComponent(int comp, const char *arrayName, 
                              int arrayComp, int min, int max, int normalize)
{
  if ( comp < 0 || comp > 2 )
    {
    vtkErrorMacro(<<"TCoord component must be between (0,2)");
    return;
    }
  
  if ( comp >= this->NumberOfTCoordComponents ) 
    {
    this->NumberOfTCoordComponents = comp + 1;
    }
  this->SetArrayName(this, this->TCoordArrays[comp], arrayName);
  if ( this->TCoordArrayComponents[comp] != arrayComp )
    {
    this->TCoordArrayComponents[comp] = arrayComp;
    this->Modified();
    }
  if ( this->TCoordComponentRange[comp][0] != min )
    {
    this->TCoordComponentRange[comp][0] = min;
    this->Modified();
    }
  if ( this->TCoordComponentRange[comp][1] != max )
    {
    this->TCoordComponentRange[comp][1] = max;
    this->Modified();
    }
  if ( this->TCoordNormalize[comp] != normalize )
    {
    this->TCoordNormalize[comp] = normalize;  
    this->Modified();
    }
}

const char *vtkFieldDataToAttributeDataFilter::GetTCoordComponentArrayName(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->TCoordArrays[comp];
}

int vtkFieldDataToAttributeDataFilter::GetTCoordComponentArrayComponent(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->TCoordArrayComponents[comp];
}

int vtkFieldDataToAttributeDataFilter::GetTCoordComponentMinRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->TCoordComponentRange[comp][0];
}

int vtkFieldDataToAttributeDataFilter::GetTCoordComponentMaxRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->TCoordComponentRange[comp][1];
}

int vtkFieldDataToAttributeDataFilter::GetTCoordComponentNormalizeFlag(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 2 ? 2 : comp));
  return this->TCoordNormalize[comp];
}

void vtkFieldDataToAttributeDataFilter::ConstructTCoords(int num, vtkFieldData *fd, 
                                                         vtkDataSetAttributes *attr,
                                                         vtkIdType componentRange[3][2], 
                                                         char *arrays[3], int arrayComp[3], 
                                                         int normalize[3], int numComp)
{
  int i, normalizeAny, updated=0;
  vtkDataArray *fieldArray[3];
  
  if ( numComp < 1 )
    {
    return;
    }
  for (i=0; i<numComp; i++)
    {
    if ( arrays[i] == NULL )
      {
      return;
      }
    }
  
  for ( normalizeAny=i=0; i < numComp; i++ )
    {
    fieldArray[i] = this->GetFieldArray(fd, arrays[i], arrayComp[i]);

    if ( fieldArray[i] == NULL )
      {
      vtkErrorMacro(<<"Can't find array/component requested");
      return;
      }
    normalizeAny |= normalize[i];
    }
  
  for (i=0; i < numComp; i++)
    {
    updated |= this->UpdateComponentRange(fieldArray[i], componentRange[i]);
    if ( num != (componentRange[i][1] - componentRange[i][0] + 1) )
      {
      vtkErrorMacro(<<"Number of texture coords not consistent");
      return;
      }
    }
  
  vtkDataArray *newTCoords;
  for (i=1; i < numComp; i++) //see whether all the data is from the same array
    {
    if ( fieldArray[i] != fieldArray[i-1] )
      {
      break;
      }
    }
  
  // see whether we can reuse the data array from the field
  if ( i >= numComp && fieldArray[0]->GetNumberOfComponents() == numComp && 
       fieldArray[0]->GetNumberOfTuples() == num && !normalizeAny )
    {
    newTCoords = fieldArray[0];
    newTCoords->Register(0);
    }
  else //have to copy data into created array
    {
    newTCoords = vtkDataArray::CreateDataArray(this->GetComponentsType(numComp, fieldArray));
    newTCoords->SetNumberOfComponents(numComp);
    newTCoords->SetNumberOfTuples(num);

    for ( i=0; i < numComp; i++ )
      {
      if ( this->ConstructArray(newTCoords, i, fieldArray[i], arrayComp[i],
                                componentRange[i][0], componentRange[i][1],
                                normalize[i]) == 0 )
        {
        newTCoords->Delete();
        return;
        }
      }
    }
  
  attr->SetTCoords(newTCoords);
  newTCoords->Delete();
  if ( updated ) //reset for next execution pass
    {
    for (i=0; i < numComp; i++)
      {
      componentRange[i][0] = componentRange[i][1] = -1;
      }
    }
}

// Stuff related to tensors --------------------------------------------
//
void vtkFieldDataToAttributeDataFilter::SetTensorComponent(int comp, const char *arrayName, 
                              int arrayComp, int min, int max, int normalize)
{
  if ( comp < 0 || comp > 8 )
    {
    vtkErrorMacro(<<"Tensor component must be between (0,8)");
    return;
    }
  
  this->SetArrayName(this, this->TensorArrays[comp], arrayName);
  if ( this->TensorArrayComponents[comp] != arrayComp )
    {
    this->TensorArrayComponents[comp] = arrayComp;
    this->Modified();
    }
  if ( this->TensorComponentRange[comp][0] != min )
    {
    this->TensorComponentRange[comp][0] = min;
    this->Modified();
    }
  if ( this->TensorComponentRange[comp][1] != max )
    {
    this->TensorComponentRange[comp][1] = max;
    this->Modified();
    }
  if ( this->TensorNormalize[comp] != normalize )
    {
    this->TensorNormalize[comp] = normalize;  
    this->Modified();
    }
}

const char *vtkFieldDataToAttributeDataFilter::GetTensorComponentArrayName(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 8 ? 8 : comp));
  return this->TensorArrays[comp];
}

int vtkFieldDataToAttributeDataFilter::GetTensorComponentArrayComponent(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 8 ? 8 : comp));
  return this->TensorArrayComponents[comp];
}

int vtkFieldDataToAttributeDataFilter::GetTensorComponentMinRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 8 ? 8 : comp));
  return this->TensorComponentRange[comp][0];
}

int vtkFieldDataToAttributeDataFilter::GetTensorComponentMaxRange(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 8 ? 8 : comp));
  return this->TensorComponentRange[comp][1];
}

int vtkFieldDataToAttributeDataFilter::GetTensorComponentNormalizeFlag(int comp)
{
  comp = (comp < 0 ? 0 : (comp > 8 ? 8 : comp));
  return this->TensorNormalize[comp];
}

void vtkFieldDataToAttributeDataFilter::ConstructTensors(int num, vtkFieldData *fd, 
                                                         vtkDataSetAttributes *attr,
                                                         vtkIdType componentRange[9][2], 
                                                         char *arrays[9], int arrayComp[9], 
                                                         int normalize[9])
{
  int i, normalizeAny, updated=0;
  vtkDataArray *fieldArray[9];

  for (i=0; i<9; i++)
    {
    if ( arrays[i] == NULL )
      {
      return;
      }
    }
  
  for ( i=0; i < 9; i++ )
    {
    fieldArray[i] = this->GetFieldArray(fd, arrays[i], arrayComp[i]);

    if ( fieldArray[i] == NULL )
      {
      vtkErrorMacro(<<"Can't find array requested");
      return;
      }
    }
  
  for (normalizeAny=i=0; i < 9; i++)
    {
    updated |= this->UpdateComponentRange(fieldArray[i], componentRange[i]);
    if ( num != (componentRange[i][1] - componentRange[i][0] + 1) )
      {
      vtkErrorMacro(<<"Number of tensors not consistent");
      return;
      }
    normalizeAny |= normalize[i];
    }
  
  vtkDataArray *newTensors;
  for (i=1; i < 9; i++) //see whether all the data is from the same array
    {
    if ( fieldArray[i] != fieldArray[i-1] )
      {
      break;
      }
    }
  
  // see whether we can reuse the data array from the field
  if ( i >= 9 && fieldArray[0]->GetNumberOfComponents() == 9 && 
       fieldArray[0]->GetNumberOfTuples() == num && !normalizeAny )
    {
    newTensors = fieldArray[0];
    newTensors->Register(0);
    }
  else //have to copy data into created array
    {
    newTensors = vtkDataArray::CreateDataArray(this->GetComponentsType(9, fieldArray));
    newTensors->SetNumberOfComponents(9);
    newTensors->SetNumberOfTuples(num);

    for ( i=0; i < 9; i++ )
      {
      if ( this->ConstructArray(newTensors, i, fieldArray[i], arrayComp[i],
                                componentRange[i][0], componentRange[i][1],
                                normalize[i]) == 0 )
        {
        newTensors->Delete();
        return;
        }
      }
    }
  
  attr->SetTensors(newTensors);
  newTensors->Delete();
  if ( updated ) //reset for next execution pass
    {
    for (i=0; i < 9; i++)
      {
      componentRange[i][0] = componentRange[i][1] = -1;
      }
    }
}

// Stuff related to fields --------------------------------------------
//
void
vtkFieldDataToAttributeDataFilter::ConstructFieldData(int vtkNotUsed(num),
                                      vtkDataSetAttributes *vtkNotUsed(attr))
{
}

// Stuff related to helper methods ---------------------------------------
//
int vtkFieldDataToAttributeDataFilter::ConstructArray(vtkDataArray *da,
                                                      int comp,
                                                      vtkDataArray *fieldArray,
                                                      int fieldComp,
                                                      vtkIdType min,
                                                      vtkIdType max,
                                                      int normalize)
{
  vtkIdType i, n=max-min+1;
  float minValue=VTK_LARGE_FLOAT;
  float maxValue= -VTK_LARGE_FLOAT;
  float compRange, compValue;

  if ( fieldComp >= fieldArray->GetNumberOfComponents() )
    {
    vtkGenericWarningMacro(<<"Trying to access component out of range");
    return 0;
    }

  for (i=0; i < n; i++)
    {
    compValue = fieldArray->GetComponent(min+i, fieldComp);
    if ( compValue < minValue )
      {
      minValue = compValue;
      }
    if ( compValue > maxValue )
      {
      maxValue = compValue;
      }
    da->SetComponent(i, comp, compValue);
    }
  
  if ( normalize )
    {
    compRange = maxValue - minValue;
    if ( compRange != 0.0 )
      {
      for (i=0; i < n; i++)
        {
        compValue = da->GetComponent(i, comp);
        compValue = (compValue - minValue) / compRange;
        da->SetComponent(i, comp, compValue);
        }
      }
    }

  return 1;
}

int vtkFieldDataToAttributeDataFilter::GetComponentsType(int numComp, vtkDataArray **arrays)
{
  int type, mostComplexType=VTK_VOID;

  for (int i=0; i < numComp; i++)
    {
    type = arrays[i]->GetDataType();
    if ( type > mostComplexType ) 
      {
      mostComplexType = type;
      }
    }

  return mostComplexType;
}

vtkDataArray *vtkFieldDataToAttributeDataFilter::GetFieldArray(vtkFieldData *fd, 
                                                               char *name, int comp)
{
  vtkDataArray *da = NULL;
  int numComp;
  int found=0;

  if ( name != NULL )
    {
    vtkDataSetAttributes* dsa;
    if ((dsa=vtkDataSetAttributes::SafeDownCast(fd)))
      {
      found=1;
      if(!strcmp("PointScalars", name) || !strcmp("CellScalars", name))
        {
        da = dsa->GetScalars();
        }
      else if(!strcmp("PointVectors", name) || !strcmp("CellVectors", name))
        {
        da = dsa->GetVectors();
        }
      else if(!strcmp("PointTensors", name) || !strcmp("CellTensors", name))
        {
        da = dsa->GetTensors();
        }
      else if(!strcmp("PointNormals", name) || !strcmp("CellNormals", name))
        {
        da = dsa->GetNormals();
        }
      else if(!strcmp("PointTCoords", name) || !strcmp("CellTCoords", name))
        {
        da = dsa->GetTCoords();
        }
      else
        {
        found=0;
        }
      }
    if (!found || !da)
      {
      da = fd->GetArray(name);
      }

    if ( da == NULL )
      {
      return NULL;
      }
    numComp = da->GetNumberOfComponents();
    if ( comp < 0 || comp >= numComp )
      {
      return NULL;
      }
    else
      {
      return da;
      }
    }

  return NULL;
}

void vtkFieldDataToAttributeDataFilter::SetArrayName(vtkObject *self, char* &name, const char *newName)
{
  if ( name && newName && (!strcmp(name,newName)))
    {
    return;
    }
  if (name)
    {
    delete [] name;
    } 
  if (newName)
    {
    name = new char[strlen(newName)+1];
    strcpy(name,newName);
    }
   else
    {
    name = NULL;
    }
  self->Modified();
}

int vtkFieldDataToAttributeDataFilter::UpdateComponentRange(vtkDataArray *da, 
                                                            vtkIdType compRange[2])
{
  if ( compRange[0] == -1 )
    {
    compRange[0] = 0;
    compRange[1] = da->GetNumberOfTuples() - 1;
    return 1;
    }
  else
    {
    return 0;
    }
}


//----------------------------------------------------------------------------
int vtkFieldDataToAttributeDataFilter::RequestUpdateExtent(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER(),
              outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER()));
  inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES(),
              outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES()));
  inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS(),
              outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS()));
  inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(),
              outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT()),
              6);
  inInfo->Set(vtkStreamingDemandDrivenPipeline::EXACT_EXTENT(),
              outInfo->Get(vtkStreamingDemandDrivenPipeline::EXACT_EXTENT()));
  return 1;
}