OCC.Core.LProp3d module¶

LProp3d module, see official documentation at https://www.opencascade.com/doc/occt-7.4.0/refman/html/package_lprop3d.html

class LProp3d_CLProps(*args)¶

Bases: object

Initializes the local properties of the curve <C> The current point and the derivatives are computed at the same time, which allows an optimization of the computation time. <N> indicates the maximum number of derivations to be done (0, 1, 2 or 3). For example, to compute only the tangent, N should be equal to 1. <Resolution> is the linear tolerance (it is used to test if a vector is null).

param C

type C

Adaptor3d_HCurve

param N

type N

int

param Resolution

type Resolution

float

rtype

None* Same as previous constructor but here the parameter is set to the value . All the computations done will be related to <C> and .

param C

type C

Adaptor3d_HCurve

param U

type U

float

param N

type N

int

param Resolution

type Resolution

float

rtype

None* Same as previous constructor but here the parameter is set to the value and the curve is set with SetCurve. the curve can have a empty constructor All the computations done will be related to <C> and when the functions ‘set’ will be done.

param N

type N

int

param Resolution

type Resolution

float

rtype

None

CentreOfCurvature()¶

Returns the centre of curvature .

param P

type P

gp_Pnt

rtype

None

Curvature()¶

Returns the curvature.

rtype

float

D1()¶

Returns the first derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

D2()¶

Returns the second derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

D3()¶

Returns the third derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

IsTangentDefined()¶

Returns True if the tangent is defined. For example, the tangent is not defined if the three first derivatives are all null.

rtype

bool

Normal()¶

Returns the normal direction <N>.

param N

type N

gp_Dir

rtype

None

SetCurve()¶

Initializes the local properties of the curve for the new curve.

param C

type C

Adaptor3d_HCurve

rtype

None

SetParameter()¶

Initializes the local properties of the curve for the parameter value .

param U

type U

float

rtype

None

Tangent()¶

output the tangent direction <D>

param D

type D

gp_Dir

rtype

None

Value()¶

Returns the Point.

rtype

gp_Pnt

property thisown¶: The membership flag

class LProp3d_CurveTool¶

Bases: object

static Continuity()¶

returns the order of continuity of the HCurve <C>. returns 1first derivative only is computable returns 2first and second derivative only are computable. returns 3first, second and third are computable.

param C

type C

Adaptor3d_HCurve

rtype

int

static D1()¶

Computes the point and first derivative <V1> of parameter on the HCurve <C>.

param C

type C

Adaptor3d_HCurve

param U

type U

float

param P

type P

gp_Pnt

param V1

type V1

gp_Vec

rtype

void

static D2()¶

Computes the point , the first derivative <V1> and second derivative <V2> of parameter on the HCurve <C>.

param C

type C

Adaptor3d_HCurve

param U

type U

float

param P

type P

gp_Pnt

param V1

type V1

gp_Vec

param V2

type V2

gp_Vec

rtype

void

static D3()¶

Computes the point , the first derivative <V1>, the second derivative <V2> and third derivative <V3> of parameter on the HCurve <C>.

param C

type C

Adaptor3d_HCurve

param U

type U

float

param P

type P

gp_Pnt

param V1

type V1

gp_Vec

param V2

type V2

gp_Vec

param V3

type V3

gp_Vec

rtype

void

static FirstParameter()¶

returns the first parameter bound of the HCurve.

param C

type C

Adaptor3d_HCurve

rtype

float

static LastParameter()¶

returns the last parameter bound of the HCurve. FirstParameter must be less than LastParamenter.

param C

type C

Adaptor3d_HCurve

rtype

float

static Value()¶

Computes the point of parameter on the HCurve <C>.

param C

type C

Adaptor3d_HCurve

param U

type U

float

param P

type P

gp_Pnt

rtype

void

property thisown¶: The membership flag

class LProp3d_SLProps(*args)¶

Bases: object

Initializes the local properties of the surface <S> for the parameter values (, <V>). The current point and the derivatives are computed at the same time, which allows an optimization of the computation time. <N> indicates the maximum number of derivations to be done (0, 1, or 2). For example, to compute only the tangent, N should be equal to 1. <Resolution> is the linear tolerance (it is used to test if a vector is null).

param S

type S

Adaptor3d_HSurface

param U

type U

float

param V

type V

float

param N

type N

int

param Resolution

type Resolution

float

rtype

None* idem as previous constructor but without setting the value of parameters and <V>.

param S

type S

Adaptor3d_HSurface

param N

type N

int

param Resolution

type Resolution

float

rtype

None* idem as previous constructor but without setting the value of parameters and <V> and the surface. the surface can have an empty constructor.

param N

type N

int

param Resolution

type Resolution

float

rtype

None

CurvatureDirections()¶

Returns the direction of the maximum and minimum curvature <MaxD> and <MinD>

param MaxD

type MaxD

gp_Dir

param MinD

type MinD

gp_Dir

rtype

None

D1U()¶

Returns the first U derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

D1V()¶

Returns the first V derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

D2U()¶

Returns the second U derivatives The derivative is computed if it has not been yet.

rtype

gp_Vec

D2V()¶

Returns the second V derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

DUV()¶

Returns the second UV cross-derivative. The derivative is computed if it has not been yet.

rtype

gp_Vec

GaussianCurvature()¶

Returns the Gaussian curvature

rtype

float

IsCurvatureDefined()¶

returns True if the curvature is defined.

rtype

bool

IsNormalDefined()¶

Tells if the normal is defined.

rtype

bool

IsTangentUDefined()¶

returns True if the U tangent is defined. For example, the tangent is not defined if the two first U derivatives are null.

rtype

bool

IsTangentVDefined()¶

returns if the V tangent is defined. For example, the tangent is not defined if the two first V derivatives are null.

rtype

bool

IsUmbilic()¶

returns True if the point is umbilic (i.e. if the curvature is constant).

rtype

bool

MaxCurvature()¶

Returns the maximum curvature

rtype

float

MeanCurvature()¶

Returns the mean curvature.

rtype

float

MinCurvature()¶

Returns the minimum curvature

rtype

float

Normal()¶

Returns the normal direction.

rtype

gp_Dir

SetParameters()¶

Initializes the local properties of the surface S for the new parameter values (, <V>).

param U

type U

float

param V

type V

float

rtype

None

SetSurface()¶

Initializes the local properties of the surface S for the new surface.

param S

type S

Adaptor3d_HSurface

rtype

None

TangentU()¶

Returns the tangent direction <D> on the iso-V.

param D

type D

gp_Dir

rtype

None

TangentV()¶

Returns the tangent direction <D> on the iso-V.

param D

type D

gp_Dir

rtype

None

Value()¶

Returns the point.

rtype

gp_Pnt

property thisown¶: The membership flag

class LProp3d_SurfaceTool¶

Bases: object

static Bounds()¶

returns the bounds of the HSurface.

param S

type S

Adaptor3d_HSurface

param U1

type U1

float

param V1

type V1

float

param U2

type U2

float

param V2

type V2

float

rtype

void

static Continuity()¶

returns the order of continuity of the HSurface <S>. returns 1first derivative only is computable returns 2first and second derivative only are computable.

param S

type S

Adaptor3d_HSurface

rtype

int

static D1()¶

Computes the point and first derivative <D1*> of parameter and <V> on the HSurface <S>.

param S

type S

Adaptor3d_HSurface

param U

type U

float

param V

type V

float

param P

type P

gp_Pnt

param D1U

type D1U

gp_Vec

param D1V

type D1V

gp_Vec

rtype

void

static D2()¶

Computes the point , the first derivative <D1*> and second derivative <D2*> of parameter and <V> on the HSurface <S>.

param S

type S

Adaptor3d_HSurface

param U

type U

float

param V

type V

float

param P

type P

gp_Pnt

param D1U

type D1U

gp_Vec

param D1V

type D1V

gp_Vec

param D2U

type D2U

gp_Vec

param D2V

type D2V

gp_Vec

param DUV

type DUV

gp_Vec

rtype

void

static DN()¶

Parameters

S –

type S: Adaptor3d_HSurface
param U
type U: float
param V
type V: float
param IU
type IU: int
param IV
type IV: int
rtype: gp_Vec

static Value()¶

Computes the point of parameter and <V> on the HSurface <S>.

param S

type S

Adaptor3d_HSurface

param U

type U

float

param V

type V

float

param P

type P

gp_Pnt

rtype

void

property thisown¶: The membership flag

class SwigPyIterator(*args, **kwargs)¶

Bases: object

advance()¶

copy()¶

decr()¶

distance()¶

equal()¶

incr()¶

next()¶

previous()¶

property thisown¶: The membership flag

value()¶