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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.
=========================================================================*/
/**
* @class vtkCellDerivatives
* @brief compute derivatives of scalars and vectors
*
* 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 (linearized or Green-Lagrange) 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.)
*
* Note that the tensor components used to be sent out in column, but they
* are now sent out not in row.
*
* @warning
* 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.
*
* @warning
* The point data is passed through the filter to the output.
*
* @sa
* vtkVectorNorm
*/
#ifndef vtkCellDerivatives_h
#define vtkCellDerivatives_h
#include "vtkFiltersGeneralModule.h" // For export macro
#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
#define VTK_TENSOR_MODE_COMPUTE_GREEN_LAGRANGE_STRAIN 3
class VTKFILTERSGENERAL_EXPORT vtkCellDerivatives : public vtkDataSetAlgorithm
{
public:
vtkTypeMacro(vtkCellDerivatives,vtkDataSetAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
/**
* Construct to compute the gradient of the scalars and vectors.
*/
static vtkCellDerivatives *New();
//@{
/**
* 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();
//@}
//@{
/**
* 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 (linearized or
* Green-Lagrange strain)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);};
void SetTensorModeToComputeGreenLagrangeStrain()
{this->SetTensorMode(VTK_TENSOR_MODE_COMPUTE_GREEN_LAGRANGE_STRAIN);};
const char *GetTensorModeAsString();
//@}
protected:
vtkCellDerivatives();
~vtkCellDerivatives() VTK_OVERRIDE {}
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) VTK_OVERRIDE;
int VectorMode;
int TensorMode;
private:
vtkCellDerivatives(const vtkCellDerivatives&) VTK_DELETE_FUNCTION;
void operator=(const vtkCellDerivatives&) VTK_DELETE_FUNCTION;
};
#endif
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