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Man Pages


Manual Reference Pages  -  SBSPHERESECTIONPROJECTOR (3)

NAME

SbSphereSectionProjector — sphere-section projector

CONTENTS

Inherits From
Synopsis
Description
Methods
File Format/defaults
See Also

INHERITS FROM

SbProjector > SbSphereProjector > SbSphereSectionProjector

SYNOPSIS

#include <Inventor/projectors/SbSphereSectionProjector.h>

Methods from class SbSphereSectionProjector:

       
                    
                     SbSphereSectionProjector(float edgeTol = .9, SbBool orientToEye = TRUE)    
   
                    
                     SbSphereSectionProjector(const SbSphere &sph, float edgeTol = .9, SbBool orientToEye = TRUE)    
   
                    
                     ~SbSphereSectionProjector()    
void    
                    
void                 setTolerance(float edgeTol)    
float    
                    
float                getTolerance() const    
void    
                    
void                 setRadialFactor(float radialFactor = 0.0)    
float    
                    
float                getRadialFactor() const    
SbBool    
                    
SbBool               isWithinTolerance(const SbVec3f &point)

Methods from class SbSphereProjector:

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

Methods from class SbProjector:

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

DESCRIPTION

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.

METHODS

       
                    
                     SbSphereSectionProjector(float edgeTol = .9, SbBool orientToEye = TRUE)    
   
                    
                     SbSphereSectionProjector(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 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 .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()
Destructor.

    void    
                    
void                 setTolerance(float edgeTol)    
float    
                    
float                getTolerance() const
Set and get 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 .1, the projector is a slice of the sphere with radius .1*radius. Default is .9.

    void    
                    
void                 setRadialFactor(float radialFactor = 0.0)    
float    
                    
float                getRadialFactor() const
Set and get 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

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

FILE FORMAT/DEFAULTS

SEE ALSO

SbCylinderProjector, SbCylinderSectionProjector, SbCylinderPlaneProjector, SbCylinderSheetProjector, SbLineProjector, SbPlaneProjector, SbSpherePlaneProjector, SbSphereSheetProjector

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