#include <nanovdb/util/Stencils.h>

Inherits BaseStencil< BoxStencil< GridT >, 8, GridT >.

Public Types
using	GridType = GridT

using	TreeType = typename GridT::TreeType

using	ValueType = typename GridT::ValueType

using	AccessorType = ReadAccessor< ValueType >

Public Member Functions
	BoxStencil (const GridType &grid)

template<int i, int j, int k>
unsigned int	pos () const
	Return linear offset for the specified stencil point relative to its center. More...

bool	intersects (ValueType isoValue=ValueType(0)) const
	Return true if the center of the stencil intersects the. More...

ValueType	interpolation (const Vec3< ValueType > &xyz) const
	Return the trilinear interpolation at the normalized position. More...

Vec3< ValueType >	gradient (const Vec3< ValueType > &xyz) const
	Return the gradient in world space of the trilinear interpolation kernel. More...

void	moveTo (const Coord &ijk)
	Initialize the stencil buffer with the values of voxel (i, j, k) and its neighbors. More...

void	moveTo (const Coord &ijk, const ValueType &centerValue)
	Initialize the stencil buffer with the values of voxel (i, j, k) and its neighbors. The method also takes a value of the center element of the stencil, assuming it is already known. More...

void	moveTo (const IterType &iter)
	Initialize the stencil buffer with the values of voxel (x, y, z) and its neighbors. More...

void	moveTo (const Vec3< RealType > &xyz)
	Initialize the stencil buffer with the values of voxel (x, y, z) and its neighbors. More...

const ValueType &	getValue (unsigned int pos=0) const
	Return the value from the stencil buffer with linear offset pos. More...

const ValueType &	getValue () const
	Return the value at the specified location relative to the center of the stencil. More...

void	setValue (const ValueType &value)
	Set the value at the specified location relative to the center of the stencil. More...

ValueType	mean () const
	Return the mean value of the current stencil. More...

ValueType	min () const
	Return the smallest value in the stencil buffer. More...

ValueType	max () const
	Return the largest value in the stencil buffer. More...

const Coord &	getCenterCoord () const
	Return the coordinates of the center point of the stencil. More...

const ValueType &	getCenterValue () const
	Return the value at the center of the stencil. More...

bool	intersects (const ValueType &isoValue=ValueType(0)) const
	Return true if the center of the stencil intersects the iso-contour specified by the isoValue. More...

Mask	intersectionMask (ValueType isoValue=ValueType(0)) const
	Return true a bit-mask where the 6 lower bits indicates if the center of the stencil intersects the iso-contour specified by the isoValue. More...

const GridType &	grid () const
	Return a const reference to the grid from which this stencil was constructed. More...

const AccessorType &	accessor () const
	Return a const reference to the ValueAccessor associated with this Stencil. More...

Static Public Member Functions
static int	size ()
	Return the size of the stencil buffer. More...

Static Public Attributes
static constexpr int	SIZE = 8

Protected Attributes
const GridType *	mGrid

AccessorType	mAcc

ValueType	mValues [SIZE]

Coord	mCenter

Friends
template<typename , int , typename >
class	BaseStencil

Member Typedef Documentation

using AccessorType = ReadAccessor<ValueType>

inherited

using GridType = GridT

using TreeType = typename GridT::TreeType

using ValueType = typename GridT::ValueType

Constructor & Destructor Documentation

BoxStencil ( const GridType & grid )

inline

Member Function Documentation

const AccessorType& accessor ( ) const

inlineinherited

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

const Coord& getCenterCoord ( ) const

inlineinherited

Return the coordinates of the center point of the stencil.

const ValueType& getCenterValue ( ) const

inlineinherited

Return the value at the center of the stencil.

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.

const ValueType& getValue ( ) const

inlineinherited

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

Vec3<ValueType> gradient ( const Vec3< ValueType > & xyz ) const

inline

Return the gradient in world space of the trilinear interpolation kernel.

Parameters

xyz	Floating point coordinate position.

Warning: It is assumed that the stencil has already been moved to the relevant voxel position, e.g. using moveTo(xyz).

Note

Computed as partial derivatives of the trilinear interpolation kernel: v000 (1-u)(1-v)(1-w) + v001 (1-u)(1-v)w + v010 (1-u)v(1-w) + v011 (1-u)vw

v100 u(1-v)(1-w) + v101 u(1-v)w + v110 uv(1-w) + v111 uvw

const GridType& grid ( ) const

inlineinherited

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

ValueType interpolation ( const Vec3< ValueType > & xyz ) const

inline

Return the trilinear interpolation at the normalized position.

Parameters

xyz	Floating point coordinate position. Index space and NOT world space.

Warning: It is assumed that the stencil has already been moved to the relevant voxel position, e.g. using moveTo(xyz).

Note

Trilinear interpolation kernal reads as: v000 (1-u)(1-v)(1-w) + v001 (1-u)(1-v)w + v010 (1-u)v(1-w) + v011 (1-u)vw

v100 u(1-v)(1-w) + v101 u(1-v)w + v110 uv(1-w) + v111 uvw

Mask intersectionMask ( ValueType isoValue = ValueType(0) ) const

inlineinherited

Return true a bit-mask where the 6 lower 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 & (1u<<2)) where mask is ther return value from this function. To check if there are any intersections use mask!=0u, and for no intersections use mask==0u. To count the number of intersections use __builtin_popcount(mask).

bool intersects ( const ValueType & isoValue = ValueType(0) ) const

inlineinherited

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

bool intersects ( ValueType isoValue = ValueType(0) ) const

inline

Return true if the center of the stencil intersects the.

iso-contour specified by the isoValue

ValueType max ( ) const

inlineinherited

Return the largest value in the stencil buffer.

ValueType mean ( ) const

inlineinherited

Return the mean value of the current stencil.

ValueType min ( ) const

inlineinherited

Return the smallest value in the stencil buffer.

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

void moveTo	(	const Coord &	ijk,
		const ValueType &	centerValue
	)

inlineinherited

Initialize the stencil buffer with the values of voxel (i, j, k) and its neighbors. The method also takes a value of the center element of the stencil, assuming it is already known.

Parameters

ijk	Index coordinates of stencil center
centerValue	Value of the center element of the stencil

void moveTo ( const IterType & iter )

inlineinherited

Initialize the stencil buffer with the values of voxel (x, y, z) and its neighbors.

Note: This version is slightly faster than the one above, since the center voxel's value is read directly from the iterator.

void moveTo ( const Vec3< RealType > & xyz )

inlineinherited

Initialize the stencil buffer with the values of voxel (x, y, z) and its neighbors.

Parameters

xyz	Floating point voxel coordinates of stencil center

This method will check to see if it is necessary to update the stencil based on the cached index coordinates of the center point.

unsigned int pos ( ) const

inline

Return linear offset for the specified stencil point relative to its center.

void setValue ( const ValueType & value )

inlineinherited

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

static int size ( )

inlinestaticinherited

Return the size of the stencil buffer.

Friends And Related Function Documentation

friend class BaseStencil

friend

Member Data Documentation

AccessorType mAcc

protectedinherited

Coord mCenter

protectedinherited

const GridType* mGrid

protectedinherited

ValueType mValues[SIZE]

protectedinherited

constexpr int SIZE = 8

static

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Attributes

Friends

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation