Sphere-section projector. More...

#include <Inventor/projectors/SbSphereSectionProjector.h>

Inheritance diagram for SbSphereSectionProjector:

Public Member Functions
	SbSphereSectionProjector (float edgeTol=.9, SbBool orientToEye=TRUE)
	Default constructor.
	SbSphereSectionProjector (const SbSphere &sph, float edgeTol=.9, SbBool orientToEye=TRUE)
	Constructor taking the sphere.
	~SbSphereSectionProjector ()
	Destructor.
virtual SbProjector *	copy () const
	Returns an instance that is a copy of this instance.
virtual SbVec3f	project (const SbVec2f &point)
	Apply the projector using the given point, 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)
float	getTolerance () const
	Set and get the edge tolerance as a fraction of the radius of the sphere.
void	setRadialFactor (float rad=0.0)
float	getRadialFactor () const
	Set and get the radial rotation factor.
SbBool	isWithinTolerance (const SbVec3f &point)
	Find whether this point on the sphere or tolerance plane is within tolerance.
Protected Member Functions
virtual void	setupTolerance ()
	Sets up the tolerance slice.
Protected Attributes
float	tolerance
	Information about the slice tolerance.
float	tolDist
	dist from planePoint to tolerance slice
float	radialFactor
SbVec3f	planePoint
	Information about the plane used for intersection testing.
SbVec3f	planeDir
	normal direction
float	planeDist
	distance from sphere center
SbPlane	tolPlane
	the plane itself

Detailed 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.

See Also

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

Definition at line 95 of file SbSphereSectionProjector.h.

Constructor & Destructor Documentation

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

The default view volume is undefined. The default working space is identity (world space). The default sphere to use has a radius of 1.0 and is centered at (0,0,0). The default edge tolerance is .9. The default eye orientation is TRUE.

SbSphereSectionProjector::SbSphereSectionProjector	(	const SbSphere &	sph,
		float	edgeTol = `.9`,
		SbBool	orientToEye = `TRUE`
	)

SbSphereSectionProjector::~SbSphereSectionProjector ( ) [inline]

Definition at line 113 of file SbSphereSectionProjector.h.

Member Function Documentation

virtual SbProjector* SbSphereSectionProjector::copy ( ) const [virtual]

The caller is responsible for deleting the copy when done.

Implements SbProjector.

Reimplemented in SbSpherePlaneProjector.

float SbSphereSectionProjector::getRadialFactor ( ) const [inline]

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 153 of file SbSphereSectionProjector.h.