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

  Program:   Visualization Toolkit
  Module:    vtkDividingCubes.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

    THIS CLASS IS PATENTED UNDER UNITED STATES PATENT NUMBER 4,719,585
    "Dividing Cubes System and Method for the Display of Surface Structures
    Contained Within the Interior Region of a Solid Body".
    Application of this software for commercial purposes requires 
    a license grant from GE. Contact:
        Jerald Roehling
        GE Licensing
        One Independence Way
        PO Box 2023
        Princeton, N.J. 08540
        phone 609-734-9823
        e-mail:Roehlinj@gerlmo.ge.com
    for more information.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
// .NAME vtkDividingCubes - create points lying on isosurface
// .SECTION Description
// vtkDividingCubes is a filter that generates points lying on a surface
// of constant scalar value (i.e., an isosurface). Dense point clouds (i.e.,
// at screen resolution) will appear as a surface. Less dense clouds can be 
// used as a source to generate streamlines or to generate "transparent"
// surfaces. This filter is based on the generate program written by
// H. Cline, S. Ludke and W. Lorensen.
//
// The density of the point cloud is controlled by the Distance instance 
// variable. This is a distance value in global coordinates specifying the 
// approximate distance between points.

#ifndef __vtkDividingCubes_h
#define __vtkDividingCubes_h

#include "vtkStructuredPointsToPolyDataFilter.h"

class VTK_EXPORT vtkDividingCubes : public vtkStructuredPointsToPolyDataFilter
{
public:
  static vtkDividingCubes *New();
  vtkTypeMacro(vtkDividingCubes,vtkStructuredPointsToPolyDataFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set isosurface value.
  vtkSetMacro(Value,float);
  vtkGetMacro(Value,float);

  // Description:
  // Specify sub-voxel size at which to generate point.
  vtkSetClampMacro(Distance,float,1.0e-06,VTK_LARGE_FLOAT);
  vtkGetMacro(Distance,float);

  // Description:
  // Every "Increment" point is added to the list of points. This parameter, if
  // set to a large value, can be used to limit the number of points while
  // retaining good accuracy.
  vtkSetClampMacro(Increment,int,1,VTK_LARGE_INTEGER);
  vtkGetMacro(Increment,int);

protected:
  vtkDividingCubes();
  ~vtkDividingCubes();
  vtkDividingCubes(const vtkDividingCubes&) {};
  void operator=(const vtkDividingCubes&) {};

  void Execute();
  void SubDivide(float origin[3], int dim[3], float h[3], float values[8]);

  float Value;
  float Distance;
  int Increment;

  // working variable
  int Count;

  vtkIdList *SubVoxelPts;
  vtkVoxel *SubVoxel;
  vtkScalars *SubVoxelScalars;
  vtkNormals *SubVoxelNormals;
};

#endif


