OpenVDB: LevelSetTracker< GridT, InterruptT > Class Template Reference

OpenVDB 11.0.0

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LevelSetTracker< GridT, InterruptT > Class Template Reference

Performs multi-threaded interface tracking of narrow band level sets. More...

`#include <openvdb/tools/LevelSetTracker.h>`

## Classes
struct | State
| Lightweight struct that stores the state of the LevelSetTracker. More...

## Public Types
using | TrimMode = lstrack::TrimMode
using | GridType = GridT
using | TreeType = typename GridT::TreeType
using | LeafType = typename TreeType::LeafNodeType
using | ValueType = typename TreeType::ValueType
using | LeafManagerType = typename tree::LeafManager<TreeType>
using | LeafRange = typename LeafManagerType::LeafRange
using | BufferType = typename LeafManagerType::BufferType
using | MaskTreeType = typename TreeType::template ValueConverter<ValueMask>::Type

## Public Member Functions
| LevelSetTracker (GridT &grid, InterruptT *interrupt=nullptr)
| Main constructor.
virtual | ~LevelSetTracker ()
template<typename MaskType >
void | normalize (const MaskType *mask)
| Iterative normalization, i.e. solving the Eikonal equation.
void | normalize ()
| Iterative normalization, i.e. solving the Eikonal equation.
void | track ()
| Track the level set interface, i.e. rebuild and normalize the narrow band of the level set.
void | prune ()
| Set voxels that are outside the narrow band to the background value (if trimming is enabled) and prune the grid.
void | dilate (int iterations=1)
| Fast but approximate dilation of the narrow band - one layer at a time. Normally we recommend using the resize method below which internally calls dilate (or erode) with the correct number of iterations to achieve the desired half voxel width of the narrow band (3 is recommended for most level set applications).
void | erode (int iterations=1)
| Erodes the width of the narrow-band and update the background values.
bool | resize (Index halfWidth=static_cast< Index >(LEVEL_SET_HALF_WIDTH))
| Resize the width of the narrow band, i.e. perform dilation and renormalization or erosion as required.
ValueType | getHalfWidth () const
| Return the half width of the narrow band in floating-point voxel units.
State | getState () const
| Return the state of the tracker (see struct defined above)
void | setState (const State &s)
| Set the state of the tracker (see struct defined above)
math::BiasedGradientScheme | getSpatialScheme () const
void | setSpatialScheme (math::BiasedGradientScheme s)
| Set the spatial finite difference scheme.
math::TemporalIntegrationScheme | getTemporalScheme () const
void | setTemporalScheme (math::TemporalIntegrationScheme s)
| Set the spatial finite difference scheme.
int | getNormCount () const
void | setNormCount (int n)
| Set the number of normalizations performed per track or normalize call.
int | getGrainSize () const
void | setGrainSize (int grainsize)
| Set the grain-size used for multi-threading.
TrimMode | trimming () const
| Return the trimming mode for voxels outside the narrow band.
void | setTrimming (TrimMode mode)
| Specify whether to trim voxels outside the narrow band prior to pruning.
ValueType | voxelSize () const
void | startInterrupter (const char *msg)
void | endInterrupter ()
bool | checkInterrupter ()
const GridType & | grid () const
LeafManagerType & | leafs ()
const LeafManagerType & | leafs () const
template<typename MaskT >
void | normalize (const MaskT *mask)

## Detailed Description

template<typename GridT, typename InterruptT = util::NullInterrupter>
class openvdb::v11_0::tools::LevelSetTracker< GridT, InterruptT >

Performs multi-threaded interface tracking of narrow band level sets.

## Member Typedef Documentation

## ◆ BufferType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using BufferType = typename LeafManagerType::BufferType

## ◆ GridType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using GridType = GridT

## ◆ LeafManagerType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using LeafManagerType = typename tree::LeafManager<TreeType>

## ◆ LeafRange

template<typename GridT , typename InterruptT = util::NullInterrupter>

using LeafRange = typename LeafManagerType::LeafRange

## ◆ LeafType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using LeafType = typename TreeType::LeafNodeType

## ◆ MaskTreeType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using MaskTreeType = typename TreeType::template ValueConverter<ValueMask>::Type

## ◆ TreeType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using TreeType = typename GridT::TreeType

## ◆ TrimMode

template<typename GridT , typename InterruptT = util::NullInterrupter>

using TrimMode = lstrack::TrimMode

## ◆ ValueType

template<typename GridT , typename InterruptT = util::NullInterrupter>

using ValueType = typename TreeType::ValueType

## Constructor & Destructor Documentation

## ◆ LevelSetTracker()

template<typename GridT , typename InterruptT >

LevelSetTracker | ( | GridT & | grid,
|  | InterruptT * | interrupt = nullptr )

Main constructor.

Exceptions

  RuntimeError | if the grid is not a level set

## ◆ ~LevelSetTracker()

template<typename GridT , typename InterruptT = util::NullInterrupter>

virtual ~LevelSetTracker | ( |  | ) |
| inlinevirtual

## Member Function Documentation

## ◆ checkInterrupter()

template<typename GridT , typename InterruptT >

bool checkInterrupter | ( |  | ) |
| inline

Returns
  false if the process was interrupted

## ◆ dilate()

template<typename GridT , typename InterruptT >

void dilate | ( | int | iterations = 1 | ) |

Fast but approximate dilation of the narrow band - one layer at a time. Normally we recommend using the resize method below which internally calls dilate (or erode) with the correct number of iterations to achieve the desired half voxel width of the narrow band (3 is recommended for most level set applications).

Note
  Since many level set applications perform interface-tracking, which in turn rebuilds the narrow-band accurately, this dilate method can often be used with a single iterations of low-order re-normalization. This effectively allows very narrow bands to be created from points or polygons (e.g. with a half voxel width of 1), followed by a fast but approximate dilation (typically with a half voxel width of 3). This can be significantly faster than generating the final width of the narrow band from points or polygons.

## ◆ endInterrupter()

template<typename GridT , typename InterruptT >

void endInterrupter | ( |  | ) |
| inline

## ◆ erode()

template<typename GridT , typename InterruptT >

void erode | ( | int | iterations = 1 | ) |

Erodes the width of the narrow-band and update the background values.

Exceptions

  ValueError | if iterations is larger than the current half-width.

## ◆ getGrainSize()

template<typename GridT , typename InterruptT = util::NullInterrupter>

int getGrainSize | ( |  | ) | const
| inline

Returns
  the grain-size used for multi-threading

## ◆ getHalfWidth()

template<typename GridT , typename InterruptT = util::NullInterrupter>

ValueType getHalfWidth | ( |  | ) | const
| inline

Return the half width of the narrow band in floating-point voxel units.

## ◆ getNormCount()

template<typename GridT , typename InterruptT = util::NullInterrupter>

int getNormCount | ( |  | ) | const
| inline

Returns
  The number of normalizations performed per track or normalize call.

## ◆ getSpatialScheme()

template<typename GridT , typename InterruptT = util::NullInterrupter>

math::BiasedGradientScheme getSpatialScheme | ( |  | ) | const
| inline

Returns
  the spatial finite difference scheme

## ◆ getState()

template<typename GridT , typename InterruptT = util::NullInterrupter>

State getState | ( |  | ) | const
| inline

Return the state of the tracker (see struct defined above)

## ◆ getTemporalScheme()

template<typename GridT , typename InterruptT = util::NullInterrupter>

math::TemporalIntegrationScheme getTemporalScheme | ( |  | ) | const
| inline

Returns
  the temporal integration scheme

## ◆ grid()

template<typename GridT , typename InterruptT = util::NullInterrupter>

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

## ◆ leafs() [1/2]

template<typename GridT , typename InterruptT = util::NullInterrupter>

LeafManagerType & leafs | ( |  | ) |
| inline

## ◆ leafs() [2/2]

template<typename GridT , typename InterruptT = util::NullInterrupter>

const LeafManagerType & leafs | ( |  | ) | const
| inline

## ◆ normalize() [1/3]

template<typename GridT , typename InterruptT = util::NullInterrupter>

void normalize | ( |  | ) |
| inline

Iterative normalization, i.e. solving the Eikonal equation.

## ◆ normalize() [2/3]

template<typename GridT , typename InterruptT = util::NullInterrupter>
template<typename MaskT >

void normalize | ( | const MaskT * | mask | ) |

## ◆ normalize() [3/3]

template<typename GridT , typename InterruptT = util::NullInterrupter>
template<typename MaskType >

void normalize | ( | const MaskType * | mask | ) |

Iterative normalization, i.e. solving the Eikonal equation.

Note
  The mask it optional and by default it is ignored.

## ◆ prune()

template<typename GridT , typename InterruptT >

void prune | ( |  | ) |

Set voxels that are outside the narrow band to the background value (if trimming is enabled) and prune the grid.

Pruning is done automatically as a step in tracking.

See also
  setTrimming, trimming

## ◆ resize()

template<typename GridT , typename InterruptT >

bool resize | ( | Index | halfWidth = static_cast<Index>(LEVEL_SET_HALF_WIDTH) | ) |

Resize the width of the narrow band, i.e. perform dilation and renormalization or erosion as required.

## ◆ setGrainSize()

template<typename GridT , typename InterruptT = util::NullInterrupter>

void setGrainSize | ( | int | grainsize | ) |
| inline

Set the grain-size used for multi-threading.

Note
  A grainsize of 0 or less disables multi-threading!

## ◆ setNormCount()

template<typename GridT , typename InterruptT = util::NullInterrupter>

void setNormCount | ( | int | n | ) |
| inline

Set the number of normalizations performed per track or normalize call.

## ◆ setSpatialScheme()

template<typename GridT , typename InterruptT = util::NullInterrupter>

void setSpatialScheme | ( | math::BiasedGradientScheme | s | ) |
| inline

Set the spatial finite difference scheme.

## ◆ setState()

template<typename GridT , typename InterruptT = util::NullInterrupter>

void setState | ( | const State & | s | ) |
| inline

Set the state of the tracker (see struct defined above)

## ◆ setTemporalScheme()

template<typename GridT , typename InterruptT = util::NullInterrupter>

void setTemporalScheme | ( | math::TemporalIntegrationScheme | s | ) |
| inline

Set the spatial finite difference scheme.

## ◆ setTrimming()

template<typename GridT , typename InterruptT = util::NullInterrupter>

void setTrimming | ( | TrimMode | mode | ) |
| inline

Specify whether to trim voxels outside the narrow band prior to pruning.

See also
  trimming, prune

## ◆ startInterrupter()

template<typename GridT , typename InterruptT >

void startInterrupter | ( | const char * | msg | ) |
| inline

## ◆ track()

template<typename GridT , typename InterruptT >

void track | ( |  | ) |

Track the level set interface, i.e. rebuild and normalize the narrow band of the level set.

## ◆ trimming()

template<typename GridT , typename InterruptT = util::NullInterrupter>

TrimMode trimming | ( |  | ) | const
| inline

Return the trimming mode for voxels outside the narrow band.

Trimming is enabled by default and is applied automatically prior to pruning.

See also
  setTrimming, prune

## ◆ voxelSize()

template<typename GridT , typename InterruptT = util::NullInterrupter>

ValueType voxelSize | ( |  | ) | const
| inline