LevelSetTracker< GridT, InterruptT > Class Template Reference

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

#include <openvdb/tools/LevelSetTracker.h>

Inherited by LevelSetFilter< GridT, MaskT, InterruptT >.

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. More...
virtual	~LevelSetTracker ()
template<typename MaskType >
void	normalize (const MaskType *mask)
	Iterative normalization, i.e. solving the Eikonal equation. More...
void	normalize ()
	Iterative normalization, i.e. solving the Eikonal equation. More...
void	track ()
	Track the level set interface, i.e. rebuild and normalize the narrow band of the level set. More...
void	prune ()
	Set voxels that are outside the narrow band to the background value (if trimming is enabled) and prune the grid. More...
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). More...
void	erode (int iterations=1)
	Erodes the width of the narrow-band and update the background values. More...
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. More...
ValueType	getHalfWidth () const
	Return the half width of the narrow band in floating-point voxel units. More...
State	getState () const
	Return the state of the tracker (see struct defined above) More...
void	setState (const State &s)
	Set the state of the tracker (see struct defined above) More...
math::BiasedGradientScheme	getSpatialScheme () const
void	setSpatialScheme (math::BiasedGradientScheme s)
	Set the spatial finite difference scheme. More...
math::TemporalIntegrationScheme	getTemporalScheme () const
void	setTemporalScheme (math::TemporalIntegrationScheme s)
	Set the spatial finite difference scheme. More...
int	getNormCount () const
void	setNormCount (int n)
	Set the number of normalizations performed per track or normalize call. More...
int	getGrainSize () const
void	setGrainSize (int grainsize)
	Set the grain-size used for multi-threading. More...
TrimMode	trimming () const
	Return the trimming mode for voxels outside the narrow band. More...
void	setTrimming (TrimMode mode)
	Specify whether to trim voxels outside the narrow band prior to pruning. More...
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::v9_0::tools::LevelSetTracker< GridT, InterruptT >

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

Member Typedef Documentation

using BufferType = typename LeafManagerType::BufferType

using GridType = GridT

using LeafManagerType = typename tree::LeafManager<TreeType>

using LeafRange = typename LeafManagerType::LeafRange

using LeafType = typename TreeType::LeafNodeType

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

using TreeType = typename GridT::TreeType

using TrimMode = lstrack::TrimMode

using ValueType = typename TreeType::ValueType

Constructor & Destructor Documentation

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

Main constructor.

Exceptions

RuntimeError

if the grid is not a level set

virtual ~LevelSetTracker ( )

inlinevirtual

Member Function Documentation

bool checkInterrupter ( )

inline

Returns

false if the process was interrupted

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.

void endInterrupter ( )

inline

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.

int getGrainSize ( ) const

inline

Returns

the grain-size used for multi-threading

ValueType getHalfWidth ( ) const

inline

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

int getNormCount ( ) const

inline

Returns

The number of normalizations performed per track or normalize call.

math::BiasedGradientScheme getSpatialScheme ( ) const

inline

Returns

the spatial finite difference scheme

State getState ( ) const

inline

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

math::TemporalIntegrationScheme getTemporalScheme ( ) const

inline

Returns

the temporal integration scheme

const GridType& grid ( ) const

inline

LeafManagerType& leafs ( )

inline

const LeafManagerType& leafs ( ) const

inline

void normalize

(

const MaskType *

mask

)

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

Note

The mask it optional and by default it is ignored.

void normalize ( )

inline

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

void normalize

(

const MaskT *

mask

)

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

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.

void setGrainSize ( int  grainsize )

inline

Set the grain-size used for multi-threading.

Note

A grainsize of 0 or less disables multi-threading!

void setNormCount ( int  n )

inline

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

void setSpatialScheme ( math::BiasedGradientScheme  s )

inline

Set the spatial finite difference scheme.

void setState ( const State &  s )

inline

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

void setTemporalScheme ( math::TemporalIntegrationScheme  s )

inline

Set the spatial finite difference scheme.

void setTrimming ( TrimMode  mode )

inline

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

See also

trimming, prune

void startInterrupter ( const char *  msg )

inline

void track

(

)

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

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

ValueType voxelSize ( ) const

inline