ON_SubDSectorSurfacePoint Class Reference

#include <opennurbs_subd.h>

Public Member Functions
bool	IsNan () const
bool	IsSet (bool bUndefinedNormalIsPossible) const
bool	IsUnset () const
bool	IsZero () const
const ON_3dVector	Normal () const
	Get a limit surface normal. More...
const ON_3dPoint	Point () const
	Get a limit surface point. More...
const ON_3dVector	Tangent (int tangent_index) const
	Get a limit surface tangent vector. More...
bool	Transform (const ON_Xform &xform)
bool	Transform (const ON_Xform &xform, const ON_Xform &xformNormals)

Public Attributes
double	m_limitN [3]
	unit normal (same direction as m_limitT1 x m_limitT2) More...
double	m_limitP [3]
	limit surface point, tangents and normal More...
double	m_limitT1 [3]
	first unit tangent More...
double	m_limitT2 [3]
	second unit tangent More...
const class ON_SubDSectorSurfacePoint *	m_next_sector_limit_point
	nullptr for vertices with one sector More...
const class ON_SubDFace *	m_sector_face
	nullptr for vertices with one sector More...

Static Public Attributes
static const ON_SubDSectorSurfacePoint	Nan
	all doubles are ON_DBL_QNAN, all pointer are nullptr More...
static const ON_SubDSectorSurfacePoint	Unset
	all doubles are ON_UNSET_VALUE, all pointer are nullptr More...
static const ON_SubDSectorSurfacePoint	Zero
	all doubles are 0.0, all pointer are nullptr More...

Member Function Documentation

IsNan()

bool ON_SubDSectorSurfacePoint::IsNan

(

)

const

Returns: true if m_limitP[0] is a nan (like ON_DBL_QNAN). false otherwise.

IsSet()

bool ON_SubDSectorSurfacePoint::IsSet

(

bool

bUndefinedNormalIsPossible

)

const

Returns: true if all coordinates are valid doubles and the tangents and normal have at least one nonzero coordinate. false otherwise.

IsUnset()

bool ON_SubDSectorSurfacePoint::IsUnset

(

)

const

Returns: true if m_limitP[0] is ON_UNSET_VALUE. false otherwise.

IsZero()

bool ON_SubDSectorSurfacePoint::IsZero

(

)

const

Returns: true if all coordinates are zero. false otherwise.

Normal()

const ON_3dVector ON_SubDSectorSurfacePoint::Normal

(

)

const

Get a limit surface normal.

Returns

Limit surface normal vector.

Point()

const ON_3dPoint ON_SubDSectorSurfacePoint::Point

(

)

const

Get a limit surface point.

Returns

Limit surface point.

Tangent()

const ON_3dVector ON_SubDSectorSurfacePoint::Tangent

(

int

tangent_index

)

const

Get a limit surface tangent vector.

Parameters

tangent_index

0 or 1

Returns

Limit surface tangent vector.

Transform() [1/2]

bool ON_SubDSectorSurfacePoint::Transform

(

const ON_Xform &

xform

)

Transform() [2/2]

bool ON_SubDSectorSurfacePoint::Transform	(	const ON_Xform &	xform,
		const ON_Xform &	xformNormals
	)

Member Data Documentation

m_limitN

double ON_SubDSectorSurfacePoint::m_limitN[3]

unit normal (same direction as m_limitT1 x m_limitT2)

m_limitP

double ON_SubDSectorSurfacePoint::m_limitP[3]

limit surface point, tangents and normal

point

m_limitT1

double ON_SubDSectorSurfacePoint::m_limitT1[3]

first unit tangent

m_limitT2

double ON_SubDSectorSurfacePoint::m_limitT2[3]

second unit tangent

m_next_sector_limit_point

const class ON_SubDSectorSurfacePoint* ON_SubDSectorSurfacePoint::m_next_sector_limit_point

nullptr for vertices with one sector

When an ON_SubDVertex has a single sector, (ON_SubDVertex.IsSingleSectorVertex() is true), these pointers are both null. When an ON_SubDVertex has a multiple sectors, m_sector_face is the "first" face in the sector and m_next_sector_limit_point is used to create a linked list. (The "first" face in a sector is the one ON_SubDSectorIterator.IncrementToCrease(-1) returns.)

m_sector_face

const class ON_SubDFace* ON_SubDSectorSurfacePoint::m_sector_face

nullptr for vertices with one sector

Nan

const ON_SubDSectorSurfacePoint ON_SubDSectorSurfacePoint::Nan

static

all doubles are ON_DBL_QNAN, all pointer are nullptr

Unset

const ON_SubDSectorSurfacePoint ON_SubDSectorSurfacePoint::Unset

static

all doubles are ON_UNSET_VALUE, all pointer are nullptr

For performance reasons, the default the data members are not initialized by the default constructor Use = ON_SubDSectorSurfacePoint::Unset when initialization is required

Zero

const ON_SubDSectorSurfacePoint ON_SubDSectorSurfacePoint::Zero

static

all doubles are 0.0, all pointer are nullptr