SbSpherePlaneProjector(3IV)

NAME
SbSpherePlaneProjector — sphere-plane projector

INHERITS FROM
SbProjector > SbSphereProjector > SbSphereSectionProjector > SbSpherePlaneProjector

SYNOPSIS
#include <Inventor/projectors/SbSpherePlaneProjector.h>

Methods from class SbSpherePlaneProjector:

SbSpherePlaneProjector(float edgeTol = .9, SbBool orientToEye = TRUE)

SbSpherePlaneProjector(const SbSphere &sph, float edgeTol = .9, SbBool orientToEye = TRUE)

~SbSpherePlaneProjector()

Methods from class SbSphereSectionProjector:

void
setTolerance(float edgeTol)
float
getTolerance() const
void
setRadialFactor(float radialFactor = 0.0)
float
getRadialFactor() const
SbBool
isWithinTolerance(const SbVec3f &point)

Methods from class SbSphereProjector:

SbVec3f
projectAndGetRotation(const SbVec2f &point, SbRotation &rot)
virtual SbRotation
getRotation(const SbVec3f &point1, const SbVec3f &point2)
void
setSphere(const SbSphere &sph)
const SbSphere &
getSphere() const
void
setOrientToEye(SbBool orientToEye)
SbBool
isOrientToEye() const
void
setFront(SbBool isFront)
SbBool
isFront() const
SbBool
isPointInFront(const SbVec3f &point) const

Methods from class SbProjector:

virtual SbVec3f
project(const SbVec2f &point)
virtual void
setViewVolume(const SbViewVolume &vol)
const SbViewVolume &
getViewVolume() const
virtual void
setWorkingSpace(const SbMatrix &space)
const SbMatrix &
getWorkingSpace() const
virtual SbProjector *
copy() const

DESCRIPTION
SbSpherePlaneProjector projects a window space point (usually based on the mouse location) onto a surface defined by a sphere and plane cutting through the sphere. Two projected points can produce a rotation about the sphere's center. When the mouse position projects onto the plane, the rotations will be as if the plane is being dragged, causing the sphere to roll beneath it.

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

METHODS

SbSpherePlaneProjector(float edgeTol = .9, SbBool orientToEye = TRUE)

SbSpherePlaneProjector(const SbSphere &sph, float edgeTol = .9, SbBool orientToEye = TRUE)
Constructors. The first uses a default sphere centered at the origin with radius 1.0; the sphere is supplied in the second. The position of the plane 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 .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.

~SbSpherePlaneProjector()
Destructor.

FILE FORMAT/DEFAULTS

SEE ALSO
SbCylinderProjector, SbCylinderPlaneProjector, SbCylinderSectionProjector, SbCylinderSheetProjector, SbLineProjector, SbPlaneProjector, SbSphereSheetProjector