vtkFlashContour.h

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

  Program:   Visualization Toolkit
  Module:    vtkFlashContour.h

  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.

=========================================================================*/
#ifndef vtkFlashContour_h
#define vtkFlashContour_h

#include "vtkMultiBlockDataSetAlgorithm.h"
#include "vtkPVVTKExtensionsFiltersGeneralModule.h" //needed for exports

class vtkImageData;
class vtkPoints;
class vtkCellArray;
class vtkUnsignedCharArray;
class vtkPolyData;
class vtkDoubleArray;
class vtkIntArray;

class VTKPVVTKEXTENSIONSFILTERSGENERAL_EXPORT vtkFlashContour : public vtkMultiBlockDataSetAlgorithm
{
public:
  static vtkFlashContour* New();
  vtkTypeMacro(vtkFlashContour, vtkMultiBlockDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  vtkSetMacro(IsoValue, double);
  vtkGetMacro(IsoValue, double);

  vtkSetStringMacro(PassAttribute);
  vtkGetStringMacro(PassAttribute);

protected:
  vtkFlashContour();
  ~vtkFlashContour() override;

  double IsoValue;
  char* PassAttribute;
  vtkDoubleArray* PassArray;

  // Just for debugging.
  vtkIntArray* BlockIdCellArray;
  int CurrentBlockId;
  // A couple cell arrays to help determine where I should refine.
  vtkUnsignedCharArray* LevelCellArray;
  unsigned char CurrentLevel;
  // Instead of maximum depth, compute the different between the
  // maximum depth and the current depth.
  vtkUnsignedCharArray* RemainingDepthCellArray;
  unsigned char RemainingDepth;
  unsigned char ComputeBranchDepth(int globalBlockId);

  vtkPoints* Points;
  vtkCellArray* Faces;
  vtkPolyData* Mesh;

  char* CellArrayNameToProcess;
  vtkSetStringMacro(CellArrayNameToProcess);

  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
  int FillInputPortInformation(int port, vtkInformation* info) override;
  int FillOutputPortInformation(int port, vtkInformation* info) override;
  void PropogateNeighbors(int neighbors[3][3][3], int x, int y, int z);

  // Save some ivars to reduce arguments to recursive methods.
  int NumberOfGlobalBlocks;
  int* GlobalLevelArray;
  int* GlobalChildrenArray;
  int* GlobalNeighborArray;
  int* GlobalToLocalMap;

  void RecurseTree(int neighborhood[3][3][3], vtkMultiBlockDataSet* input);
  void ProcessBlock(vtkImageData* block);
  void ProcessCell(const double* origin, const double* spacing, const double* cornerValues,
    const double* passValues);
  void ProcessNeighborhoodSharedRegion(
    int neighborhood[3][3][3], int r[3], vtkMultiBlockDataSet* input);
  void ProcessSharedRegion(int regionDims[3], double* cornerPtrs[8], int incs[3],
    double cornerPoints[32], double cornerSpacings[32], int cornerLevelDiffs[8],
    double* passPtrs[8]);
  void ProcessDegenerateCell(double cornerPoints[32], double* cornerPtrs[8], double* passPtrs[8]);
  void ProcessCellFinal(const double cornerPoints[32], const double cornerValues[8], int cubeCase,
    const double passValues[8]);

private:
  vtkFlashContour(const vtkFlashContour&) = delete;
  void operator=(const vtkFlashContour&) = delete;
};

#endif