OdGeSphere Class

Class Hierarchy

Syntax

C++

class OdGeSphere : public OdGeSurface;

File

GeSphere.h

Description

This class represents spheres.

Remarks

A sphere is defined by its

radius
center
northAxis
refAxis

northAxis defines the direction from the center to the north pole.

refAxis, a vector orthogonal to northAxis, the prime meridian.

Latitude is defined by the U parameter, which defaults to [-OdaPI/2, OdaPI/2] for closed spheres. The lower bound maps to the south pole, zero maps to the equator, and the upper bound maps to the north pole.

Longitude is defined by the V parameter, which defaults to [-OdaPI, OdaPI) for closed spheres. Zero corresponds to the meridian defined by the refAxis of this sphere. Applying the right hand rule along the northAxis defines the increasing direction for V. However, if isReverseV() is true, the increasing direction for V is defined by the left hand rule.

The sphere is periodic in V with a period of Oda2PI.

[umin, umax] by [vmin, vmax] defines a spherical patch with 4 sides bounded by 2 longitudinal arcs and 2 latitudinal arcs.

The following constraints apply when defining a patch.

umin < umax and |umin - umax| <= OdaPI.
vmin < vmax and |vmin - vmax| <= Oda2PI.

Corresponding C++ library: TD_Ge

See Also

Working with Spheress

Group

OdGe Classes

Public Methods

	Name	Description
	OdGeSphere	This is the overview for the OdGeSphere constructor overload.

OdGeSphere Methods

	Name	Description
	center	Returns the center of this sphere.
	getAnglesInU	Retrieves the start and end longitude.
	getAnglesInV	Retrieves the start and end latitude.
	intersectWith	Checks if this sphere intersects with a line entity, and returns the number of intersections and the points of intersection.
	isClosed	Checks if the equator is a full circle.
	isOuterNormal	Checks if the normal to this surface is pointing outward.
	isReverseV	Checks whether V parameter is increasing in clockwise direction around northAxis.
	northAxis	Returns the direction to the north pole of this sphere.
	northPole	Returns the location of the north pole.
	radius	Returns the radius of this sphere.
	refAxis	Returns the reference axis of this sphere.
	set	This is the overview for the set method overload.
	setAnglesInU	Sets the starting and ending longitudes.
	setAnglesInV	Sets the starting and ending latitudes.
	setRadius	Sets the radius of this sphere.
	setReverseV	Specifies whether the V parameter should be measured clockwise around northAxis, rather than counterclockwise.
	southPole	Returns the location of the south pole.

OdGeSphere Operators

	Name	Description
	=	This is =, a member of class OdGeSphere.

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