Geom_SphericalSurface Class Reference

Describes a sphere. A sphere is defined by its radius, and is positioned in space by a coordinate system (a gp_Ax3 object), the origin of which is the center of the sphere. This coordinate system is the "local coordinate system" of the sphere. The following apply: More...

`#include <Geom_SphericalSurface.hxx>`

Inheritance diagram for Geom_SphericalSurface: [legend]

## Public Member Functions

Geom_SphericalSurface (const gp_Ax3 &A3, const Standard_Real Radius)
A3 is the local coordinate system of the surface. At the creation the parametrization of the surface is defined such as the normal Vector (N = D1U ^ D1V) is directed away from the center of the sphere. The direction of increasing parametric value V is defined by the rotation around the "YDirection" of A2 in the trigonometric sense and the orientation of increasing parametric value U is defined by the rotation around the main direction of A2 in the trigonometric sense. Warnings : It is not forbidden to create a spherical surface with Radius = 0.0 Raised if Radius < 0.0. More...

Geom_SphericalSurface (const gp_Sphere &S)
Creates a SphericalSurface from a non persistent Sphere from package gp. More...

Assigns the value R to the radius of this sphere. Exceptions Standard_ConstructionError if R is less than 0.0. More...

void SetSphere (const gp_Sphere &S)
Converts the gp_Sphere S into this sphere. More...

gp_Sphere Sphere () const
Returns a non persistent sphere with the same geometric properties as <me>. More...

Standard_Real UReversedParameter (const Standard_Real U) const override
Computes the u parameter on the modified surface, when reversing its u parametric direction, for any point of u parameter U on this sphere. In the case of a sphere, these functions returns 2.PI - U. More...

Standard_Real VReversedParameter (const Standard_Real V) const override
Computes the v parameter on the modified surface, when reversing its v parametric direction, for any point of v parameter V on this sphere. In the case of a sphere, these functions returns -U. More...

Standard_Real Area () const
Computes the aera of the spherical surface. More...

void Bounds (Standard_Real &U1, Standard_Real &U2, Standard_Real &V1, Standard_Real &V2) const override
Returns the parametric bounds U1, U2, V1 and V2 of this sphere. For a sphere: U1 = 0, U2 = 2*PI, V1 = -PI/2, V2 = PI/2. More...

void Coefficients (Standard_Real &A1, Standard_Real &A2, Standard_Real &A3, Standard_Real &B1, Standard_Real &B2, Standard_Real &B3, Standard_Real &C1, Standard_Real &C2, Standard_Real &C3, Standard_Real &D) const
Returns the coefficients of the implicit equation of the quadric in the absolute cartesian coordinates system : These coefficients are normalized. A1.X**2 + A2.Y**2 + A3.Z**2 + 2.(B1.X.Y + B2.X.Z + B3.Y.Z) + 2.(C1.X + C2.Y + C3.Z) + D = 0.0. More...

Computes the coefficients of the implicit equation of this quadric in the absolute Cartesian coordinate system: A1.X**2 + A2.Y**2 + A3.Z**2 + 2.(B1.X.Y + B2.X.Z + B3.Y.Z) + 2.(C1.X + C2.Y + C3.Z) + D = 0.0 An implicit normalization is applied (i.e. A1 = A2 = 1. in the local coordinate system of this sphere). More...

Standard_Real Volume () const
Computes the volume of the spherical surface. More...

Standard_Boolean IsUClosed () const override
Returns True. More...

Standard_Boolean IsVClosed () const override
Returns False. More...

Standard_Boolean IsUPeriodic () const override
Returns True. More...

Standard_Boolean IsVPeriodic () const override
Returns False. More...

Handle< Geom_CurveUIso (const Standard_Real U) const override
Computes the U isoparametric curve. The U isoparametric curves of the surface are defined by the section of the spherical surface with plane obtained by rotation of the plane (Location, XAxis, ZAxis) around ZAxis. This plane defines the origin of parametrization u. For a SphericalSurface the UIso curve is a Circle. Warnings : The radius of this circle can be zero. More...

Handle< Geom_CurveVIso (const Standard_Real V) const override
Computes the V isoparametric curve. The V isoparametric curves of the surface are defined by the section of the spherical surface with plane parallel to the plane (Location, XAxis, YAxis). This plane defines the origin of parametrization V. Be careful if V is close to PI/2 or 3*PI/2 the radius of the circle becomes tiny. It is not forbidden in this toolkit to create circle with radius = 0.0 For a SphericalSurface the VIso curve is a Circle. Warnings : The radius of this circle can be zero. More...

void D0 (const Standard_Real U, const Standard_Real V, gp_Pnt &P) const override
Computes the point P (U, V) on the surface. P (U, V) = Loc + Radius * Sin (V) * Zdir + Radius * Cos (V) * (cos (U) * XDir + sin (U) * YDir) where Loc is the origin of the placement plane (XAxis, YAxis) XDir is the direction of the XAxis and YDir the direction of the YAxis and ZDir the direction of the ZAxis. More...

void D1 (const Standard_Real U, const Standard_Real V, gp_Pnt &P, gp_Vec &D1U, gp_Vec &D1V) const override
Computes the current point and the first derivatives in the directions U and V. More...

void D2 (const Standard_Real U, const Standard_Real V, gp_Pnt &P, gp_Vec &D1U, gp_Vec &D1V, gp_Vec &D2U, gp_Vec &D2V, gp_Vec &D2UV) const override
Computes the current point, the first and the second derivatives in the directions U and V. More...

void D3 (const Standard_Real U, const Standard_Real V, gp_Pnt &P, gp_Vec &D1U, gp_Vec &D1V, gp_Vec &D2U, gp_Vec &D2V, gp_Vec &D2UV, gp_Vec &D3U, gp_Vec &D3V, gp_Vec &D3UUV, gp_Vec &D3UVV) const override
Computes the current point, the first,the second and the third derivatives in the directions U and V. More...

gp_Vec DN (const Standard_Real U, const Standard_Real V, const Standard_Integer Nu, const Standard_Integer Nv) const override
Computes the derivative of order Nu in the direction u and Nv in the direction v. Raised if Nu + Nv < 1 or Nu < 0 or Nv < 0. More...

void Transform (const gp_Trsf &T) override
Applies the transformation T to this sphere. More...

Handle< Geom_GeometryCopy () const override
Creates a new object which is a copy of this sphere. More...

virtual void DumpJson (Standard_OStream &theOStream, Standard_Integer theDepth=-1) const override
Dumps the content of me into the stream. More... Public Member Functions inherited from Geom_ElementarySurface
void SetAxis (const gp_Ax1 &theA1)
Changes the main axis (ZAxis) of the elementary surface. More...

void SetLocation (const gp_Pnt &theLoc)
Changes the location of the local coordinates system of the surface. More...

void SetPosition (const gp_Ax3 &theAx3)
Changes the local coordinates system of the surface. More...

const gp_Ax1Axis () const
Returns the main axis of the surface (ZAxis). More...

const gp_PntLocation () const
Returns the location point of the local coordinate system of the surface. More...

const gp_Ax3Position () const
Returns the local coordinates system of the surface. More...

virtual void UReverse () override
Reverses the U parametric direction of the surface. More...

virtual void VReverse () override
Reverses the V parametric direction of the surface. More...

GeomAbs_Shape Continuity () const override
Returns GeomAbs_CN, the global continuity of any elementary surface. More...

Standard_Boolean IsCNu (const Standard_Integer N) const override
Returns True. More...

Standard_Boolean IsCNv (const Standard_Integer N) const override
Returns True. More... Public Member Functions inherited from Geom_Surface
Handle< Geom_SurfaceUReversed () const
Reverses the U direction of parametrization of <me>. The bounds of the surface are not modified. A copy of <me> is returned. More...

Handle< Geom_SurfaceVReversed () const
Reverses the V direction of parametrization of <me>. The bounds of the surface are not modified. A copy of <me> is returned. More...

virtual void TransformParameters (Standard_Real &U, Standard_Real &V, const gp_Trsf &T) const
Computes the parameters on the transformed surface for the transform of the point of parameters U,V on <me>. More...

virtual gp_GTrsf2d ParametricTransformation (const gp_Trsf &T) const
Returns a 2d transformation used to find the new parameters of a point on the transformed surface. More...

virtual Standard_Real UPeriod () const
Returns the period of this surface in the u parametric direction. raises if the surface is not uperiodic. More...

virtual Standard_Real VPeriod () const
Returns the period of this surface in the v parametric direction. raises if the surface is not vperiodic. More...

gp_Pnt Value (const Standard_Real U, const Standard_Real V) const
Computes the point of parameter U on the surface. More... Public Member Functions inherited from Geom_Geometry
void Mirror (const gp_Pnt &P)
Performs the symmetrical transformation of a Geometry with respect to the point P which is the center of the symmetry. More...

void Mirror (const gp_Ax1 &A1)
Performs the symmetrical transformation of a Geometry with respect to an axis placement which is the axis of the symmetry. More...

void Mirror (const gp_Ax2 &A2)
Performs the symmetrical transformation of a Geometry with respect to a plane. The axis placement A2 locates the plane of the symmetry : (Location, XDirection, YDirection). More...

void Rotate (const gp_Ax1 &A1, const Standard_Real Ang)
Rotates a Geometry. A1 is the axis of the rotation. Ang is the angular value of the rotation in radians. More...

void Scale (const gp_Pnt &P, const Standard_Real S)
Scales a Geometry. S is the scaling value. More...

void Translate (const gp_Vec &V)
Translates a Geometry. V is the vector of the tanslation. More...

void Translate (const gp_Pnt &P1, const gp_Pnt &P2)
Translates a Geometry from the point P1 to the point P2. More...

Handle< Geom_GeometryMirrored (const gp_Pnt &P) const

Handle< Geom_GeometryMirrored (const gp_Ax1 &A1) const

Handle< Geom_GeometryMirrored (const gp_Ax2 &A2) const

Handle< Geom_GeometryRotated (const gp_Ax1 &A1, const Standard_Real Ang) const

Handle< Geom_GeometryScaled (const gp_Pnt &P, const Standard_Real S) const

Handle< Geom_GeometryTransformed (const gp_Trsf &T) const

Handle< Geom_GeometryTranslated (const gp_Vec &V) const

Handle< Geom_GeometryTranslated (const gp_Pnt &P1, const gp_Pnt &P2) const Public Member Functions inherited from Standard_Transient
Standard_Transient ()
Empty constructor. More...

Standard_Transient (const Standard_Transient &)
Copy constructor – does nothing. More...

Standard_Transientoperator= (const Standard_Transient &)
Assignment operator, needed to avoid copying reference counter. More...

virtual ~Standard_Transient ()
Destructor must be virtual. More...

virtual void Delete () const
Memory deallocator for transient classes. More...

virtual const opencascade::handle< Standard_Type > & DynamicType () const

Standard_Boolean IsInstance (const opencascade::handle< Standard_Type > &theType) const
Returns a true value if this is an instance of Type. More...

Standard_Boolean IsInstance (const Standard_CString theTypeName) const
Returns a true value if this is an instance of TypeName. More...

Standard_Boolean IsKind (const opencascade::handle< Standard_Type > &theType) const
Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Boolean IsKind (const Standard_CString theTypeName) const
Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_TransientThis () const
Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero. More...

Standard_Integer GetRefCount () const
Get the reference counter of this object. More...

void IncrementRefCounter () const
Increments the reference counter of this object. More...

Standard_Integer DecrementRefCounter () const
Decrements the reference counter of this object; returns the decremented value. More... Public Types inherited from Standard_Transient
typedef void base_type Static Public Member Functions inherited from Standard_Transient
static const char * get_type_name ()

static const opencascade::handle< Standard_Type > & get_type_descriptor ()
Returns type descriptor of Standard_Transient class. More... Protected Attributes inherited from Geom_ElementarySurface
gp_Ax3 pos

## Detailed Description

Describes a sphere. A sphere is defined by its radius, and is positioned in space by a coordinate system (a gp_Ax3 object), the origin of which is the center of the sphere. This coordinate system is the "local coordinate system" of the sphere. The following apply:

• Rotation around its "main Axis", in the trigonometric sense given by the "X Direction" and the "Y Direction", defines the u parametric direction.
• Its "X Axis" gives the origin for the u parameter.
• The "reference meridian" of the sphere is a half-circle, of radius equal to the radius of the sphere. It is located in the plane defined by the origin, "X Direction" and "main Direction", centered on the origin, and positioned on the positive side of the "X Axis".
• Rotation around the "Y Axis" gives the v parameter on the reference meridian.
• The "X Axis" gives the origin of the v parameter on the reference meridian.
• The v parametric direction is oriented by the "main Direction", i.e. when v increases, the Z coordinate increases. (This implies that the "Y Direction" orients the reference meridian only when the local coordinate system is indirect.)
• The u isoparametric curve is a half-circle obtained by rotating the reference meridian of the sphere through an angle u around the "main Axis", in the trigonometric sense defined by the "X Direction" and the "Y Direction". The parametric equation of the sphere is: P(u,v) = O + R*cos(v)*(cos(u)*XDir + sin(u)*YDir)+R*sin(v)*ZDir where:
• O, XDir, YDir and ZDir are respectively the origin, the "X Direction", the "Y Direction" and the "Z Direction" of its local coordinate system, and
• R is the radius of the sphere. The parametric range of the two parameters is:
• [ 0, 2.*Pi ] for u, and
• [ - Pi/2., + Pi/2. ] for v.

## ◆ Geom_SphericalSurface() [1/2]

 Geom_SphericalSurface::Geom_SphericalSurface ( const gp_Ax3 & A3, const Standard_Real Radius )

A3 is the local coordinate system of the surface. At the creation the parametrization of the surface is defined such as the normal Vector (N = D1U ^ D1V) is directed away from the center of the sphere. The direction of increasing parametric value V is defined by the rotation around the "YDirection" of A2 in the trigonometric sense and the orientation of increasing parametric value U is defined by the rotation around the main direction of A2 in the trigonometric sense. Warnings : It is not forbidden to create a spherical surface with Radius = 0.0 Raised if Radius < 0.0.

## ◆ Geom_SphericalSurface() [2/2]

 Geom_SphericalSurface::Geom_SphericalSurface ( const gp_Sphere & S )

Creates a SphericalSurface from a non persistent Sphere from package gp.

## ◆ Area()

 Standard_Real Geom_SphericalSurface::Area ( ) const

Computes the aera of the spherical surface.

## ◆ Bounds()

 void Geom_SphericalSurface::Bounds ( Standard_Real & U1, Standard_Real & U2, Standard_Real & V1, Standard_Real & V2 ) const
overridevirtual

Returns the parametric bounds U1, U2, V1 and V2 of this sphere. For a sphere: U1 = 0, U2 = 2*PI, V1 = -PI/2, V2 = PI/2.

Implements Geom_Surface.

## ◆ Coefficients()

 void Geom_SphericalSurface::Coefficients ( Standard_Real & A1, Standard_Real & A2, Standard_Real & A3, Standard_Real & B1, Standard_Real & B2, Standard_Real & B3, Standard_Real & C1, Standard_Real & C2, Standard_Real & C3, Standard_Real & D ) const

Returns the coefficients of the implicit equation of the quadric in the absolute cartesian coordinates system : These coefficients are normalized. A1.X**2 + A2.Y**2 + A3.Z**2 + 2.(B1.X.Y + B2.X.Z + B3.Y.Z) + 2.(C1.X + C2.Y + C3.Z) + D = 0.0.

## ◆ Copy()

 Handle< Geom_Geometry > Geom_SphericalSurface::Copy ( ) const
overridevirtual

Creates a new object which is a copy of this sphere.

Implements Geom_Geometry.

## ◆ D0()

 void Geom_SphericalSurface::D0 ( const Standard_Real U, const Standard_Real V, gp_Pnt & P ) const
overridevirtual

Computes the point P (U, V) on the surface. P (U, V) = Loc + Radius * Sin (V) * Zdir + Radius * Cos (V) * (cos (U) * XDir + sin (U) * YDir) where Loc is the origin of the placement plane (XAxis, YAxis) XDir is the direction of the XAxis and YDir the direction of the YAxis and ZDir the direction of the ZAxis.

Implements Geom_Surface.

## ◆ D1()

 void Geom_SphericalSurface::D1 ( const Standard_Real U, const Standard_Real V, gp_Pnt & P, gp_Vec & D1U, gp_Vec & D1V ) const
overridevirtual

Computes the current point and the first derivatives in the directions U and V.

Implements Geom_Surface.

## ◆ D2()

 void Geom_SphericalSurface::D2 ( const Standard_Real U, const Standard_Real V, gp_Pnt & P, gp_Vec & D1U, gp_Vec & D1V, gp_Vec & D2U, gp_Vec & D2V, gp_Vec & D2UV ) const
overridevirtual

Computes the current point, the first and the second derivatives in the directions U and V.

Implements Geom_Surface.

## ◆ D3()

 void Geom_SphericalSurface::D3 ( const Standard_Real U, const Standard_Real V, gp_Pnt & P, gp_Vec & D1U, gp_Vec & D1V, gp_Vec & D2U, gp_Vec & D2V, gp_Vec & D2UV, gp_Vec & D3U, gp_Vec & D3V, gp_Vec & D3UUV, gp_Vec & D3UVV ) const
overridevirtual

Computes the current point, the first,the second and the third derivatives in the directions U and V.

Implements Geom_Surface.

## ◆ DN()

 gp_Vec Geom_SphericalSurface::DN ( const Standard_Real U, const Standard_Real V, const Standard_Integer Nu, const Standard_Integer Nv ) const
overridevirtual

Computes the derivative of order Nu in the direction u and Nv in the direction v. Raised if Nu + Nv < 1 or Nu < 0 or Nv < 0.

Implements Geom_Surface.

## ◆ DumpJson()

 virtual void Geom_SphericalSurface::DumpJson ( Standard_OStream & theOStream, Standard_Integer theDepth = `-1` ) const
overridevirtual

Dumps the content of me into the stream.

Reimplemented from Geom_ElementarySurface.

## ◆ IsUClosed()

 Standard_Boolean Geom_SphericalSurface::IsUClosed ( ) const
overridevirtual

Returns True.

Implements Geom_Surface.

## ◆ IsUPeriodic()

 Standard_Boolean Geom_SphericalSurface::IsUPeriodic ( ) const
overridevirtual

Returns True.

Implements Geom_Surface.

## ◆ IsVClosed()

 Standard_Boolean Geom_SphericalSurface::IsVClosed ( ) const
overridevirtual

Returns False.

Implements Geom_Surface.

## ◆ IsVPeriodic()

 Standard_Boolean Geom_SphericalSurface::IsVPeriodic ( ) const
overridevirtual

Returns False.

Implements Geom_Surface.

Computes the coefficients of the implicit equation of this quadric in the absolute Cartesian coordinate system: A1.X**2 + A2.Y**2 + A3.Z**2 + 2.(B1.X.Y + B2.X.Z + B3.Y.Z) + 2.(C1.X + C2.Y + C3.Z) + D = 0.0 An implicit normalization is applied (i.e. A1 = A2 = 1. in the local coordinate system of this sphere).

 void Geom_SphericalSurface::SetRadius ( const Standard_Real R )

Assigns the value R to the radius of this sphere. Exceptions Standard_ConstructionError if R is less than 0.0.

## ◆ SetSphere()

 void Geom_SphericalSurface::SetSphere ( const gp_Sphere & S )

Converts the gp_Sphere S into this sphere.

## ◆ Sphere()

 gp_Sphere Geom_SphericalSurface::Sphere ( ) const

Returns a non persistent sphere with the same geometric properties as <me>.

## ◆ Transform()

 void Geom_SphericalSurface::Transform ( const gp_Trsf & T )
overridevirtual

Applies the transformation T to this sphere.

Implements Geom_Geometry.

## ◆ UIso()

 Handle< Geom_Curve > Geom_SphericalSurface::UIso ( const Standard_Real U ) const
overridevirtual

Computes the U isoparametric curve. The U isoparametric curves of the surface are defined by the section of the spherical surface with plane obtained by rotation of the plane (Location, XAxis, ZAxis) around ZAxis. This plane defines the origin of parametrization u. For a SphericalSurface the UIso curve is a Circle. Warnings : The radius of this circle can be zero.

Implements Geom_Surface.

## ◆ UReversedParameter()

 Standard_Real Geom_SphericalSurface::UReversedParameter ( const Standard_Real U ) const
overridevirtual

Computes the u parameter on the modified surface, when reversing its u parametric direction, for any point of u parameter U on this sphere. In the case of a sphere, these functions returns 2.PI - U.

Implements Geom_ElementarySurface.

## ◆ VIso()

 Handle< Geom_Curve > Geom_SphericalSurface::VIso ( const Standard_Real V ) const
overridevirtual

Computes the V isoparametric curve. The V isoparametric curves of the surface are defined by the section of the spherical surface with plane parallel to the plane (Location, XAxis, YAxis). This plane defines the origin of parametrization V. Be careful if V is close to PI/2 or 3*PI/2 the radius of the circle becomes tiny. It is not forbidden in this toolkit to create circle with radius = 0.0 For a SphericalSurface the VIso curve is a Circle. Warnings : The radius of this circle can be zero.

Implements Geom_Surface.

## ◆ Volume()

 Standard_Real Geom_SphericalSurface::Volume ( ) const

Computes the volume of the spherical surface.

## ◆ VReversedParameter()

 Standard_Real Geom_SphericalSurface::VReversedParameter ( const Standard_Real V ) const
overridevirtual

Computes the v parameter on the modified surface, when reversing its v parametric direction, for any point of v parameter V on this sphere. In the case of a sphere, these functions returns -U.

Implements Geom_ElementarySurface.

The documentation for this class was generated from the following file: