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

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


Copyright (c) 1993-1996 Ken Martin, Will Schroeder, Bill Lorensen.

This software is copyrighted by Ken Martin, Will Schroeder and Bill Lorensen.
The following terms apply to all files associated with the software unless
explicitly disclaimed in individual files. This copyright specifically does
not apply to the related textbook "The Visualization Toolkit" ISBN
013199837-4 published by Prentice Hall which is covered by its own copyright.

The authors hereby grant permission to use, copy, and distribute this
software and its documentation for any purpose, provided that existing
copyright notices are retained in all copies and that this notice is included
verbatim in any distributions. Additionally, the authors grant permission to
modify this software and its documentation for any purpose, provided that
such modifications are not distributed without the explicit consent of the
authors and that existing copyright notices are retained in all copies. Some
of the algorithms implemented by this software are patented, observe all
applicable patent law.

IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF,
EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, AND NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN
"AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.


=========================================================================*/
// .NAME vtkImplicitModeller - compute distance from input geometry on structured point dataset
// .SECTION Description
// vtkImplicitModeller is a filter that computes the distance from the input
// geometry to the points in a structured point set. This distance function can 
// then be "contoured" to generate new, offset surfaces from the original 
// geometry. An important feature of this object is "capping". If capping is 
// turned on, after  the implicit model is created, the values on the boundary 
// of the structured points dataset are set to the cap value. This is used to 
// force closure of the resulting contoured surface. Note, however, that large 
// cap values can generate weird surface normals in those cells adjacent to the 
// boundary of the dataset. Using s amller cap value will reduce this effect.

// .SECTION See Also
// vtkSampleFunction vtkContourFilter

#ifndef __vtkImplicitModeller_h
#define __vtkImplicitModeller_h

#include "vtkDataSetToStructuredPointsFilter.h"

class vtkImplicitModeller : public vtkDataSetToStructuredPointsFilter 
{
public:
  vtkImplicitModeller();
  char *GetClassName() {return "vtkImplicitModeller";};
  void PrintSelf(ostream& os, vtkIndent indent);

  float ComputeModelBounds();

  // Description:
  // Set/Get the i-j-k dimensions on which to sample distance function.
  vtkGetVectorMacro(SampleDimensions,int,3);
  void SetSampleDimensions(int i, int j, int k);
  void SetSampleDimensions(int dim[3]);

  // Description:
  // Specify distance away from surface of input geometry to sample. Smaller
  // values make large increases in performance.
  vtkSetClampMacro(MaximumDistance,float,0.0,1.0);
  vtkGetMacro(MaximumDistance,float);

  // Description:
  // Specify the region in space in which to perform the sampling.
  vtkSetVectorMacro(ModelBounds,float,6);
  vtkGetVectorMacro(ModelBounds,float,6);
  void SetModelBounds(float xmin, float xmax, float ymin, float ymax, float zmin, float zmax);

  // Description:
  // The outer boundary of the structured point set can be assigned a 
  // particular value. This can be used to close or "cap" all surfaces.
  vtkSetMacro(Capping,int);
  vtkGetMacro(Capping,int);
  vtkBooleanMacro(Capping,int);
  
  // Description:
  // Specify the capping value to use. The CapValue is also used as an
  // initial distance value at each point in the dataset.
  vtkSetMacro(CapValue,float);
  vtkGetMacro(CapValue,float);

protected:
  void Execute();
  void Cap(vtkFloatScalars *s);

  int SampleDimensions[3];
  float MaximumDistance;
  float ModelBounds[6];
  int Capping;
  float CapValue;
};

#endif


