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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCellDerivatives.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.
=========================================================================*/
// .NAME vtkCellDerivatives - compute derivatives of scalars and vectors
// .SECTION Description
// vtkCellDerivatives is a filter that computes derivatives of scalars
// and vectors at the center of cells. You can choose to generate
// different output including the scalar gradient (a vector), computed
// tensor vorticity (a vector), gradient of input vectors (a tensor),
// and strain matrix of the input vectors (a tensor); or you may
// choose to pass data through to the output.
//
// Note that it is assumed that on input scalars and vector point data
// is available, which are then used to generate cell vectors and tensors.
// (The interpolation functions of the cells are used to compute the
// derivatives which is why point data is required.)
// .SECTION Caveats
// The computed derivatives are cell attribute data; you can convert them to
// point attribute data by using the vtkCellDataToPointData filter.
// Note that, due to the interpolation function used (obtained using
// 1/r**2 normalized sum), the derivatives calculated for polygons
// with more than 4 vertices are inaccurate in most cases.
//
// The point data is passed through the filter to the output.
// .SECTION See Also
// vtkVectorNorm
#ifndef __vtkCellDerivatives_h
#define __vtkCellDerivatives_h
#include "vtkDataSetAlgorithm.h"
#define VTK_VECTOR_MODE_PASS_VECTORS 0
#define VTK_VECTOR_MODE_COMPUTE_GRADIENT 1
#define VTK_VECTOR_MODE_COMPUTE_VORTICITY 2
#define VTK_TENSOR_MODE_PASS_TENSORS 0
#define VTK_TENSOR_MODE_COMPUTE_GRADIENT 1
#define VTK_TENSOR_MODE_COMPUTE_STRAIN 2
class VTK_GRAPHICS_EXPORT vtkCellDerivatives : public vtkDataSetAlgorithm
{
public:
vtkTypeMacro(vtkCellDerivatives,vtkDataSetAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Construct to compute the gradient of the scalars and vectors.
static vtkCellDerivatives *New();
// Description:
// Control how the filter works to generate vector cell data. You
// can choose to pass the input cell vectors, compute the gradient
// of the input scalars, or extract the vorticity of the computed
// vector gradient tensor. By default (VectorModeToComputeGradient),
// the filter will take the gradient of the input scalar data.
vtkSetMacro(VectorMode,int);
vtkGetMacro(VectorMode,int);
void SetVectorModeToPassVectors()
{this->SetVectorMode(VTK_VECTOR_MODE_PASS_VECTORS);};
void SetVectorModeToComputeGradient()
{this->SetVectorMode(VTK_VECTOR_MODE_COMPUTE_GRADIENT);};
void SetVectorModeToComputeVorticity()
{this->SetVectorMode(VTK_VECTOR_MODE_COMPUTE_VORTICITY);};
const char *GetVectorModeAsString();
// Description:
// Control how the filter works to generate tensor cell data. You can
// choose to pass the input cell tensors, compute the gradient of
// the input vectors, or compute the strain tensor of the vector gradient
// tensor. By default (TensorModeToComputeGradient), the filter will
// take the gradient of the vector data to construct a tensor.
vtkSetMacro(TensorMode,int);
vtkGetMacro(TensorMode,int);
void SetTensorModeToPassTensors()
{this->SetTensorMode(VTK_TENSOR_MODE_PASS_TENSORS);};
void SetTensorModeToComputeGradient()
{this->SetTensorMode(VTK_TENSOR_MODE_COMPUTE_GRADIENT);};
void SetTensorModeToComputeStrain()
{this->SetTensorMode(VTK_TENSOR_MODE_COMPUTE_STRAIN);};
const char *GetTensorModeAsString();
protected:
vtkCellDerivatives();
~vtkCellDerivatives() {};
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
int VectorMode;
int TensorMode;
private:
vtkCellDerivatives(const vtkCellDerivatives&); // Not implemented.
void operator=(const vtkCellDerivatives&); // Not implemented.
};
#endif
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