OpenVDB: CurvatureStencil< GridT, IsSafe > Class Template Reference

OpenVDB 12.1.0

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CurvatureStencil< GridT, IsSafe > Class Template Reference

`#include <openvdb/math/Stencils.h>`

Inheritance diagram for CurvatureStencil< GridT, IsSafe >:

## Public Types
typedef GridT | GridType
typedef GridT::TreeType | TreeType
typedef GridT::ValueType | ValueType
typedef tree::ValueAccessor< const TreeType, IsSafe > | AccessorType
typedef std::vector< ValueType > | BufferType

## Public Member Functions
| CurvatureStencil (const GridType &grid)
| CurvatureStencil (const GridType &grid, Real dx)
ValueType | meanCurvature () const
| Return the mean curvature at the previously buffered location.
ValueType | gaussianCurvature () const
| Return the Gaussian curvature at the previously buffered location.
void | curvatures (ValueType &mean, ValueType &gauss) const
| Return both the mean and the Gaussian curvature at the previously buffered location.
ValueType | meanCurvatureNormGrad () const
ValueType | gaussianCurvatureNormGrad () const
void | curvaturesNormGrad (ValueType &mean, ValueType &gauss) const
| Return both the mean and the Gaussian curvature at the previously buffered location.
std::pair< ValueType, ValueType > | principalCurvatures () const
| Return the pair (minimum, maximum) principal curvature at the previously buffered location.
ValueType | laplacian () const
math::Vec3< ValueType > | gradient () const
void | moveTo (const Coord &ijk)
| Initialize the stencil buffer with the values of voxel (i, j, k) and its neighbors.
const ValueType & | getValue (unsigned int pos=0) const
| Return the value from the stencil buffer with linear offset pos.
void | setValue (const ValueType &value)
| Set the value at the specified location relative to the center of the stencil.
int | size ()
| Return the size of the stencil buffer.
ValueType | median () const
| Return the median value of the current stencil.
ValueType | mean () const
| Return the mean value of the current stencil.
ValueType | min () const
| Return the smallest value in the stencil buffer.
ValueType | max () const
| Return the largest value in the stencil buffer.
const Coord & | getCenterCoord () const
| Return the coordinates of the center point of the stencil.
const ValueType & | getCenterValue () const
| Return the value at the center of the stencil.
bool | intersects (const ValueType &isoValue=zeroVal< ValueType >()) const
| Return true if the center of the stencil intersects the iso-contour specified by the isoValue.
std::bitset< 6 > | intersectionMask (const ValueType &isoValue=zeroVal< ValueType >()) const
| Return true a bit-mask where the 6 bits indicates if the center of the stencil intersects the iso-contour specified by the isoValue.
const GridType & | grid () const
| Return a const reference to the grid from which this stencil was constructed.
const AccessorType & | accessor () const
| Return a const reference to the ValueAccessor associated with this Stencil.

## Static Public Attributes
static const int | SIZE = 19

## Protected Attributes
const GridType * | mGrid
Coord | mCenter

## Friends
template<typename, typename, bool>
class | BaseStencil

## Member Typedef Documentation

## ◆ AccessorType

typedef tree::ValueAccessor<const TreeType, IsSafe> AccessorType
| inherited

## ◆ BufferType

typedef std::vector<ValueType> BufferType
| inherited

## ◆ GridType

template<typename GridT, bool IsSafe = true>

typedef GridT GridType

## ◆ TreeType

template<typename GridT, bool IsSafe = true>

typedef GridT::TreeType TreeType

## ◆ ValueType

template<typename GridT, bool IsSafe = true>

typedef GridT::ValueType ValueType

## Constructor & Destructor Documentation

## ◆ CurvatureStencil() [1/2]

template<typename GridT, bool IsSafe = true>

CurvatureStencil | ( | const GridType & | grid | ) |
| inline

## ◆ CurvatureStencil() [2/2]

template<typename GridT, bool IsSafe = true>

CurvatureStencil | ( | const GridType & | grid,
|  | Real | dx )
| inline

## Member Function Documentation

## ◆ accessor()

const AccessorType & accessor | ( |  | ) | const
| inlineinherited

Return a const reference to the ValueAccessor associated with this Stencil.

## ◆ curvatures()

template<typename GridT, bool IsSafe = true>

void curvatures | ( | ValueType & | mean,
|  | ValueType & | gauss ) const
| inline

Return both the mean and the Gaussian curvature at the previously buffered location.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ curvaturesNormGrad()

template<typename GridT, bool IsSafe = true>

void curvaturesNormGrad | ( | ValueType & | mean,
|  | ValueType & | gauss ) const
| inline

Return both the mean and the Gaussian curvature at the previously buffered location.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ gaussianCurvature()

template<typename GridT, bool IsSafe = true>

ValueType gaussianCurvature | ( |  | ) | const
| inline

Return the Gaussian curvature at the previously buffered location.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ gaussianCurvatureNormGrad()

template<typename GridT, bool IsSafe = true>

ValueType gaussianCurvatureNormGrad | ( |  | ) | const
| inline

Return the mean Gaussian multiplied by the norm of the central-difference gradient.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ getCenterCoord()

const Coord & getCenterCoord | ( |  | ) | const
| inlineinherited

Return the coordinates of the center point of the stencil.

## ◆ getCenterValue()

const ValueType & getCenterValue | ( |  | ) | const
| inlineinherited

Return the value at the center of the stencil.

## ◆ getValue()

const ValueType & getValue | ( | unsigned int | pos = 0 | ) | const
| inlineinherited

Return the value from the stencil buffer with linear offset pos.

Note
  The default (pos = 0) corresponds to the first element which is typically the center point of the stencil.

## ◆ gradient()

template<typename GridT, bool IsSafe = true>

math::Vec3< ValueType > gradient | ( |  | ) | const
| inline

Return the gradient computed at the previously buffered location by second-order central differencing.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ grid()

const GridType & grid | ( |  | ) | const
| inlineinherited

Return a const reference to the grid from which this stencil was constructed.

## ◆ intersectionMask()

std::bitset< 6 > intersectionMask | ( | const ValueType & | isoValue = zeroVal<ValueType>() | ) | const
| inlineinherited

Return true a bit-mask where the 6 bits indicates if the center of the stencil intersects the iso-contour specified by the isoValue.

Note
  There are 2^6 = 64 different possible cases, including no intersections!

The ordering of bit mask is ( -x, +x, -y, +y, -z, +z ), so to check if there is an intersection in -y use mask.test(2) where mask is ther return value from this function. To check if there are any intersections use mask.any(), and for no intersections use mask.none(). To count the number of intersections use mask.count().

## ◆ intersects()

bool intersects | ( | const ValueType & | isoValue = zeroVal<ValueType>() | ) | const
| inlineinherited

Return true if the center of the stencil intersects the iso-contour specified by the isoValue.

## ◆ laplacian()

template<typename GridT, bool IsSafe = true>

ValueType laplacian | ( |  | ) | const
| inline

Return the Laplacian computed at the previously buffered location by second-order central differencing.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ max()

ValueType max | ( |  | ) | const
| inlineinherited

Return the largest value in the stencil buffer.

## ◆ mean()

ValueType mean | ( |  | ) | const
| inlineinherited

Return the mean value of the current stencil.

## ◆ meanCurvature()

template<typename GridT, bool IsSafe = true>

ValueType meanCurvature | ( |  | ) | const
| inline

Return the mean curvature at the previously buffered location.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ meanCurvatureNormGrad()

template<typename GridT, bool IsSafe = true>

ValueType meanCurvatureNormGrad | ( |  | ) | const
| inline

Return the mean curvature multiplied by the norm of the central-difference gradient. This method is very useful for mean-curvature flow of level sets!

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ median()

ValueType median | ( |  | ) | const
| inlineinherited

Return the median value of the current stencil.

## ◆ min()

ValueType min | ( |  | ) | const
| inlineinherited

Return the smallest value in the stencil buffer.

## ◆ moveTo()

void moveTo | ( | const Coord & | ijk | ) |
| inlineinherited

Initialize the stencil buffer with the values of voxel (i, j, k) and its neighbors.

Parameters

  ijk | Index coordinates of stencil center

## ◆ principalCurvatures()

template<typename GridT, bool IsSafe = true>

std::pair< ValueType, ValueType > principalCurvatures | ( |  | ) | const
| inline

Return the pair (minimum, maximum) principal curvature at the previously buffered location.

Note
  This method should not be called until the stencil buffer has been populated via a call to moveTo(ijk).

## ◆ setValue()

void setValue | ( | const ValueType & | value | ) |
| inlineinherited

Set the value at the specified location relative to the center of the stencil.

## ◆ size()

int size | ( |  | ) |
| inlineinherited

Return the size of the stencil buffer.

## Friends And Related Symbol Documentation

## ◆ BaseStencil

template<typename GridT, bool IsSafe = true>
template<typename, typename, bool>

friend class BaseStencil
| friend

## Member Data Documentation

## ◆ mCenter

Coord mCenter
| protectedinherited

## ◆ mGrid

const GridType* mGrid
| protectedinherited

## ◆ SIZE

template<typename GridT, bool IsSafe = true>

const int SIZE = 19
| static