Sphere-section projector. More...

#include <Inventor/projectors/SbSphereSectionProjector.h>

Inheritance diagram for SbSphereSectionProjector:

Public Member Functions
	SbSphereSectionProjector (float edgeTol=0.9f, SbBool orientToEye=TRUE)
	Constructor that uses a default sphere centered at the origin with radius 1.0.

	SbSphereSectionProjector (const SbSphere &sph, float edgeTol=0.9f, SbBool orientToEye=TRUE)
	Constructor that uses a supplied sphere.

	~SbSphereSectionProjector ()
	Destructor.

virtual SbProjector *	copy () const
	Returns an instance that is a copy of this instance.

virtual SbVec3f	project (const SbVec2f &point)
	Applies the projector using the given point, returning the point in three dimensions that it projects to.

virtual SbVec3f	intersect (const SbLine &line)
	Applies the projector using the given line in world coordinates, returning the point in three dimensions that it projects to.

virtual SbRotation	getRotation (const SbVec3f &point1, const SbVec3f &point2)
	Computes a rotation based on two points on this projector.

void	setTolerance (float edgeTol)
	Sets the edge tolerance as a fraction of the radius of the sphere.

float	getTolerance () const
	Gets the edge tolerance as a fraction of the radius of the sphere.

void	setRadialFactor (float rad=0.0)
	Sets the radial rotation factor.

float	getRadialFactor () const
	Gets the radial rotation factor.

SbBool	isWithinTolerance (const SbVec3f &point)
	Finds whether this point on the sphere or tolerance plane is within tolerance.

Public Member Functions inherited from SbSphereProjector
SbVec3f	projectAndGetRotation (const SbVec2f &point, SbRotation &rot)
	Applies the projector using the given point, returning the point in three dimensions that it projects to.

void	setSphere (const SbSphere &sph)
	Sets the sphere on which to project points.

const SbSphere &	getSphere () const
	Gets the sphere on which to project points.

void	setOrientToEye (SbBool orientToEye)
	Sets whether the projector should always be oriented towards the eye.

SbBool	isOrientToEye () const
	Gets whether the projector should always be oriented towards the eye.

void	setFront (SbBool inFront)
	Sets whether the projector should intersect the half of the sphere that faces the eye.

SbBool	isFront () const
	Gets whether the projector should intersect the half of the sphere that faces the eye.

SbBool	isPointInFront (const SbVec3f &point) const
	Gets whether the projector should intersect the half of the sphere that faces the eye.

virtual void	setWorkingSpace (const SbMatrix &space)
	Sets the transform space to work in.

virtual	~SbSphereProjector ()
	Destructor.

Public Member Functions inherited from SbProjector
virtual	~SbProjector ()
	Destructor.

virtual void	setViewVolume (const SbViewVolume &vol)
	Set the view volume to use for the projection.

const SbViewVolume &	getViewVolume () const
	Get the view volume to use for the projection.

const SbMatrix &	getWorkingSpace () const
	Get the transform space to work in.

Detailed Description

Sphere-section projector.

SbSphereSectionProjector projects a window space point (usually based on the mouse location) onto the section of a sphere that has been sliced by a plane. Two projected points can produce a rotation about the sphere's center. The tolerance slice can be specified as a fraction of the radius of the sphere. The projection point will not extend beyond the sliced portion of the sphere.

Incremental changes (delta rotation) can be computed during interactive sessions. Sphere projectors are typically used to write interactive 3D manipulators and viewers.

Constructor & Destructor Documentation

◆ SbSphereSectionProjector() [1/2]

SbSphereSectionProjector::SbSphereSectionProjector	(	float	edgeTol = `0.9f`,
		SbBool	orientToEye = `TRUE`
	)

Constructor that uses a default sphere centered at the origin with radius 1.0.

The position of the plane which slices the sphere into a section is specified as a fraction of the sphere radius with the parameter edgeTol. A tolerance value of 1.0 positions the plane down the center of the sphere. A tolerance value of 0.5 defines the longitudinal plane halfway between the center and the outside edge of the sphere. The default value is 0.9, so that almost half the sphere is in front of the plane. The orientToEye parameter determines whether the plane is perpendicular to the eye, or perpendicular to the sphere's Z axis. Setting that parameter to TRUE (the default) specifies that the plane be perpendicular to the eye, which is most often the desired behavior.

The default view volume is undefined, and the working space is identity.

◆ SbSphereSectionProjector() [2/2]

SbSphereSectionProjector::SbSphereSectionProjector	(	const SbSphere &	sph,
		float	edgeTol = `0.9f`,
		SbBool	orientToEye = `TRUE`
	)

Constructor that uses a supplied sphere.

The position of the plane which slices the sphere into a section is specified as a fraction of the sphere radius with the parameter edgeTol. A tolerance value of 1.0 positions the plane down the center of the sphere. A tolerance value of 0.5 defines the longitudinal plane halfway between the center and the outside edge of the sphere. The default value is 0.9, so that almost half the sphere is in front of the plane. The orientToEye parameter determines whether the plane is perpendicular to the eye, or perpendicular to the sphere's Z axis. Setting that parameter to TRUE (the default) specifies that the plane be perpendicular to the eye, which is most often the desired behavior.

The default view volume is undefined, and the working space is identity.

◆ ~SbSphereSectionProjector()

SbSphereSectionProjector::~SbSphereSectionProjector ( )

inline

Destructor.

Definition at line 126 of file SbSphereSectionProjector.h.

Member Function Documentation

◆ copy()

virtual SbProjector * SbSphereSectionProjector::copy ( ) const

virtual

Returns an instance that is a copy of this instance.

The caller is responsible for deleting the copy when done.

Implements SbProjector.

Reimplemented in SbSpherePlaneProjector.

◆ getRadialFactor()

float SbSphereSectionProjector::getRadialFactor ( ) const

inline

Gets the radial rotation factor.

Definition at line 178 of file SbSphereSectionProjector.h.

◆ getRotation()

virtual SbRotation SbSphereSectionProjector::getRotation	(	const SbVec3f &	point1,
		const SbVec3f &	point2
	)

virtual

Computes a rotation based on two points on this projector.

Implements SbSphereProjector.

Reimplemented in SbSpherePlaneProjector.

◆ getTolerance()

float SbSphereSectionProjector::getTolerance ( ) const

inline

Gets the edge tolerance as a fraction of the radius of the sphere.

Definition at line 160 of file SbSphereSectionProjector.h.

◆ intersect()

virtual SbVec3f SbSphereSectionProjector::intersect ( const SbLine & line )

virtual

Applies the projector using the given line in world coordinates, returning the point in three dimensions that it projects to.

New for v3.0.

Implements SbSphereProjector.

Reimplemented in SbSpherePlaneProjector.

◆ isWithinTolerance()

SbBool SbSphereSectionProjector::isWithinTolerance ( const SbVec3f & point )

Finds whether this point on the sphere or tolerance plane is within tolerance.

◆ project()

virtual SbVec3f SbSphereSectionProjector::project ( const SbVec2f & point )

virtual

Applies the projector using the given point, returning the point in three dimensions that it projects to.

The point should be normalized from 0-1, with (0,0) at the lower-left.

Implements SbSphereProjector.

Reimplemented in SbSpherePlaneProjector.

◆ setRadialFactor()

void SbSphereSectionProjector::setRadialFactor ( float rad = 0.0 )

inline

Sets the radial rotation factor.

When the mouse is dragged off the edge of the sphere, the mouse motion can be classified as either tangential (moving in a circle around the sphere) or radial (moving toward or away from the center). The tangential motion will always map to a rotation around the center, (like the hands of a clock). The radial motion, by default, has no effect. But if you set the radialFactor to be > 0.0, this motion will make the sphere rotate as if the mouse is pulling the top of the sphere out toward the mouse. If radialFactor = 1.0, then pulling has a ‘normal’ feel (that is, the mouse motion causes the same amount of rotation as if you had rotated by hitting the actual surface of the sphere). Default is 0.0

Definition at line 174 of file SbSphereSectionProjector.h.

◆ setTolerance()

void SbSphereSectionProjector::setTolerance ( float edgeTol )

Sets the edge tolerance as a fraction of the radius of the sphere.

If this is 1.0, the projector is a hemisphere. If this is 0.1, the projector is a slice of the sphere with radius 0.1*radius. Default is 0.9.

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

Inventor/projectors/SbSphereSectionProjector.h

Open Inventor Release 2024.2.1

Public Member Functions

Detailed Description

SEE ALSO

Constructor & Destructor Documentation

◆ SbSphereSectionProjector() [1/2]

◆ SbSphereSectionProjector() [2/2]

◆ ~SbSphereSectionProjector()

Member Function Documentation

◆ copy()

◆ getRadialFactor()

◆ getRotation()

◆ getTolerance()

◆ intersect()

◆ isWithinTolerance()

◆ project()

◆ setRadialFactor()

◆ setTolerance()