LevelSetMeasure< GridT, InterruptT > Class Template Reference

Multi-threaded computation of surface area, volume and average mean-curvature for narrow band level sets. More...

#include <openvdb/tools/LevelSetMeasure.h>

Public Types
using	GridType = GridT
using	TreeType = typename GridType::TreeType
using	ValueType = typename TreeType::ValueType
using	ManagerType = typename tree::LeafManager< const TreeType >

Public Member Functions
	LevelSetMeasure (const GridType &grid, InterruptT *interrupt=nullptr)
	Main constructor from a grid. More...
void	init (const GridType &grid)
	Re-initialize using the specified grid. More...
virtual	~LevelSetMeasure ()
	Destructor. More...
int	getGrainSize () const
void	setGrainSize (int grainsize)
	Set the grain-size used for multi-threading. More...
Real	area (bool useWorldUnits=true)
	Compute the surface area of the level set. More...
Real	volume (bool useWorldUnits=true)
	Compute the volume of the level set surface. More...
Real	totMeanCurvature (bool useWorldUnits=true)
	Compute the total mean curvature of the level set surface. More...
Real	totGaussianCurvature (bool useWorldUnits=true)
	Compute the total gaussian curvature of the level set surface. More...
Real	avgMeanCurvature (bool useWorldUnits=true)
	Compute the average mean curvature of the level set surface. More...
Real	avgGaussianCurvature (bool useWorldUnits=true)
	Compute the average gaussian curvature of the level set surface. More...
int	eulerCharacteristic ()
	Compute the Euler characteristic of the level set surface. More...
int	genus ()
	Compute the genus of the level set surface. More...

Detailed Description

template<typename GridT, typename InterruptT = util::NullInterrupter>
class openvdb::v13_0::tools::LevelSetMeasure< GridT, InterruptT >

Multi-threaded computation of surface area, volume and average mean-curvature for narrow band level sets.

To reduce the risk of round-off errors (primarily due to catastrophic cancellation) and guarantee determinism during multi-threading this class is implemented using parallel_for, and delayed reduction of a sorted list.

Member Typedef Documentation

using GridType = GridT

using ManagerType = typename tree::LeafManager<const TreeType>

using TreeType = typename GridType::TreeType

using ValueType = typename TreeType::ValueType

Constructor & Destructor Documentation

LevelSetMeasure ( const GridType &  grid, InterruptT *  interrupt = nullptr  )

inline

Main constructor from a grid.

Parameters

grid	The level set to be measured.
interrupt	Optional interrupter.

Exceptions

RuntimeError

if the grid is not a level set or if it's empty.

virtual ~LevelSetMeasure ( )

inlinevirtual

Destructor.

Member Function Documentation

Real area ( bool  useWorldUnits = true )

inline

Compute the surface area of the level set.

Parameters

useWorldUnits

Specifies if the result is in world or voxel units.

Note

Performs internal caching so only the initial call incurs actual computation.

Real avgGaussianCurvature ( bool  useWorldUnits = true )

inline

Compute the average gaussian curvature of the level set surface.

Parameters

useWorldUnits

Specifies if the result is in world or voxel units.

Note

Performs internal caching so only the initial call incurs actual computation.

Real avgMeanCurvature ( bool  useWorldUnits = true )

inline

Compute the average mean curvature of the level set surface.

Parameters

useWorldUnits

Specifies if the result is in world or voxel units.

Note

Performs internal caching so only the initial call incurs actual computation.

int eulerCharacteristic ( )

inline

Compute the Euler characteristic of the level set surface.

Note

Performs internal caching so only the initial call incurs actual computation.

int genus ( )

inline

Compute the genus of the level set surface.

Warning

The genus is only well defined for a single connected surface.

Note

Performs internal caching so only the initial call incurs actual computation.

int getGrainSize ( ) const

inline

Returns

the grain-size used for multi-threading

void init ( const GridType &  grid )

inline

Re-initialize using the specified grid.

Parameters

grid	The level set to be measured.

Exceptions

RuntimeError

if the grid is not a level set or if it's empty.

void setGrainSize ( int  grainsize )

inline

Set the grain-size used for multi-threading.

Note

A grain size of 0 or less disables multi-threading!

Real totGaussianCurvature ( bool  useWorldUnits = true )

inline

Compute the total gaussian curvature of the level set surface.

Parameters

useWorldUnits

Specifies if the result is in world or voxel units.

Note

Performs internal caching so only the initial call incurs actual computation.

Real totMeanCurvature ( bool  useWorldUnits = true )

inline

Compute the total mean curvature of the level set surface.

Parameters

useWorldUnits

Specifies if the result is in world or voxel units.

Note

Performs internal caching so only the initial call incurs actual computation.

Real volume ( bool  useWorldUnits = true )

inline

Compute the volume of the level set surface.

Parameters

useWorldUnits

Specifies if the result is in world or voxel units.

Note

Performs internal caching so only the initial call incurs actual computation.