ON_SubDSurfaceNurbsFragment Class Reference

#include <opennurbs_subd.h>

Public Types
enum	BispanAccuracy : unsigned char { BispanAccuracy::None = 0, BispanAccuracy::Exact = 1, BispanAccuracy::Approximate = 2 }
	ON_SubDSurfaceNurbsFragment::BispanAccuracy specifies if a bispan surface is an exact or approximate. More...
enum	Type : unsigned char { Type::Unset = 0, Type::BicubicSingle = 1, Type::BicubicQuadrant = 4 }
	ON_SubDSurfaceNurbsFragment::Type are types bezier bispans covering a portion of a SubD face. More...

Public Member Functions
	ON_SubDSurfaceNurbsFragment ()=default
	ON_SubDSurfaceNurbsFragment (const ON_SubDSurfaceNurbsFragment &)=default
	~ON_SubDSurfaceNurbsFragment ()=default
ON_NurbsSurface *	GetQuadrantSurface (unsigned int quadrant_index, ON_NurbsSurface *destination_surface) const
ON_NurbsSurface *	GetSurface (ON_NurbsSurface *destination_surface) const
bool	IsApproximate () const
bool	IsEmpty () const
unsigned int	MaximumBispanCount () const
ON_SubDSurfaceNurbsFragment &	operator= (const ON_SubDSurfaceNurbsFragment &)=default
unsigned int	SetBispanCount () const
unsigned int	UnsetBispanCount () const

Public Attributes
ON_SubDSurfaceNurbsFragment::BispanAccuracy	m_bispan_type [4] = {}
ON_SubDFaceRegion	m_face_region
	m_face_region identifies what part of the SubD is represented by this patch More...
double	m_patch_cv [5][5][3]
	knot vector is uniform and not clamped. For example {-2,-1,0,1,2,3,4}. More...
ON_SubDSurfaceNurbsFragment::Type	m_type = ON_SubDSurfaceNurbsFragment::Type::Unset

Static Public Attributes
static const ON_SubDSurfaceNurbsFragment	Empty
	Every field of ON_SubDSurfaceNurbsFragment::Empty is zero. More...
static const ON_SubDSurfaceNurbsFragment	Nan
static const ON_SubDSurfaceNurbsFragment	Unset

Member Enumeration Documentation

BispanAccuracy

enum ON_SubDSurfaceNurbsFragment::BispanAccuracy : unsigned char

strong

ON_SubDSurfaceNurbsFragment::BispanAccuracy specifies if a bispan surface is an exact or approximate.

Enumerator
None	summary>No bispan. summary>Entire region identified by m_face_region is an exact bicubic patch.
Exact	summary>Entire region identified by m_face_region is approximately a bicubic patch.
Approximate

Type

enum ON_SubDSurfaceNurbsFragment::Type : unsigned char

strong

ON_SubDSurfaceNurbsFragment::Type are types bezier bispans covering a portion of a SubD face.

Enumerator
Unset	summary>Not a valid patch type. summary>This fragment is a single 4x4 bicubic span covering the entire SubD region identified by m_face_region.
BicubicSingle	summary>The bispans in this fragment are quadrants of the SubD region identified by m_face_region.
BicubicQuadrant

Constructor & Destructor Documentation

ON_SubDSurfaceNurbsFragment() [1/2]

ON_SubDSurfaceNurbsFragment::ON_SubDSurfaceNurbsFragment ( )

default

~ON_SubDSurfaceNurbsFragment()

ON_SubDSurfaceNurbsFragment::~ON_SubDSurfaceNurbsFragment ( )

default

ON_SubDSurfaceNurbsFragment() [2/2]

ON_SubDSurfaceNurbsFragment::ON_SubDSurfaceNurbsFragment ( const ON_SubDSurfaceNurbsFragment &  )

default

Member Function Documentation

GetQuadrantSurface()

ON_NurbsSurface* ON_SubDSurfaceNurbsFragment::GetQuadrantSurface	(	unsigned int	quadrant_index,
		ON_NurbsSurface *	destination_surface
	)		const

GetSurface()

ON_NurbsSurface* ON_SubDSurfaceNurbsFragment::GetSurface

(

ON_NurbsSurface *

destination_surface

)

const

IsApproximate()

bool ON_SubDSurfaceNurbsFragment::IsApproximate

(

)

const

Returns: One or more of the bispans approximate the SubD surface.

IsEmpty()

bool ON_SubDSurfaceNurbsFragment::IsEmpty

(

)

const

True if there are no set bispans.

MaximumBispanCount()

unsigned int ON_SubDSurfaceNurbsFragment::MaximumBispanCount

(

)

const

Returns: 0: unset NURBS fragment 1: This NURBS fragment uses a single bicubic span to model the region identified by m_face_region. 4: This NURBS fragment uses 4 bicubic spans to model the 4 quadrants of the region identified by m_face_region.

operator=()

ON_SubDSurfaceNurbsFragment& ON_SubDSurfaceNurbsFragment::operator= ( const ON_SubDSurfaceNurbsFragment &  )

default

SetBispanCount()

unsigned int ON_SubDSurfaceNurbsFragment::SetBispanCount

(

)

const

Returns: 0 to 4 indicating the number of bicubic spans that are set in this NURBS fragment. Remarks: If 0 < SetBispanCount() == MaximumBispanCount(), then the entire region identified by m_face_region is modeled by this NURBS fragment.

If 0 < SetBispanCount() < MaximumBispanCount(), then that many quadrants of the region identified by m_face_region are modeled by this set bispans in this NURBS fragment.

UnsetBispanCount()

unsigned int ON_SubDSurfaceNurbsFragment::UnsetBispanCount

(

)

const

Returns: 0 to 4 indicating the number of unset bicubic spans in "this".

Member Data Documentation

Empty

const ON_SubDSurfaceNurbsFragment ON_SubDSurfaceNurbsFragment::Empty

static

Every field of ON_SubDSurfaceNurbsFragment::Empty is zero.

m_bispan_type

ON_SubDSurfaceNurbsFragment::BispanAccuracy ON_SubDSurfaceNurbsFragment::m_bispan_type[4] = {}

m_patch_type[] reports what type of patch is returned in m_patch_cv[] m_patch_type[0] = the state for the uniform bi-cubic patch: CV[i][j] = m_patch_cv[i][j] (0 <= i <= 3, 0 <= j <= 3) knot[0] = {-2,-1,0,1,2,3} knot[1] = {-2,-1,0,1,2,3} m_patch_type[1] = the state for the uniform bi-cubic patch: CV[i][j] = m_patch_cv[i+1][j] (0 <= i <= 3, 0 <= j <= 3) knot[0] = {-1,0,1,2,3,4} knot[1] = {-2,-1,0,1,2,3} m_patch_type[2] = the state for the uniform bi-cubic patch: CV[i][j] = m_patch_cv[i+1][j+1] (0 <= i <= 3, 0 <= j <= 3) knot[0] = {-1,0,1,2,3,4} knot[1] = {-1,0,1,2,3,4} m_patch_type[3] = the state for the uniform bi-cubic patch: CV[i][j] = m_patch_cv[i][j+1] (0 <= i <= 3, 0 <= j <= 3) knot[0] = {-2,-1,0,1,2,3} knot[1] = {-1,0,1,2,3,4}

Single bicubic bezier covers the region: m_patch_type[] = {Bicubic or ApproximateBicubic, Ignore, Ignore, Ignore} Bicubic quadrants Each m_patch_type[] element is one of BicubicQuadrant, ApproximateBicubicQuadrant, or None.

m_face_region

ON_SubDFaceRegion ON_SubDSurfaceNurbsFragment::m_face_region

m_face_region identifies what part of the SubD is represented by this patch

m_patch_cv

double ON_SubDSurfaceNurbsFragment::m_patch_cv[5][5][3]

knot vector is uniform and not clamped. For example {-2,-1,0,1,2,3,4}.

m_type

ON_SubDSurfaceNurbsFragment::Type ON_SubDSurfaceNurbsFragment::m_type = ON_SubDSurfaceNurbsFragment::Type::Unset

Nan

const ON_SubDSurfaceNurbsFragment ON_SubDSurfaceNurbsFragment::Nan

static

Every m_patch_cv[][][] value is ON_DBL_QNAN. Every other field of ON_SubDSurfaceNurbsFragment::Unset is zero.

Unset

const ON_SubDSurfaceNurbsFragment ON_SubDSurfaceNurbsFragment::Unset

static

Every m_patch_cv[][][] value is ON_UNSET_VALUE. Every other field of ON_SubDSurfaceNurbsFragment::Unset is zero.