Sphere-sheet projector. More...

#include <Inventor/projectors/SbSphereSheetProjector.h>

Inheritance diagram for SbSphereSheetProjector:

Public Member Functions
	SbSphereSheetProjector (SbBool orientToEye=TRUE)
	SbSphereSheetProjector (const SbSphere &sph, SbBool orientToEye=TRUE)
	Constructors.
	~SbSphereSheetProjector ()
	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.
Protected Member Functions
void	setupPlane ()
	Sets up the plane use to project on to.
Protected Attributes
SbVec3f	workingProjPoint
	The projection point in working space.
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

SbSphereSheetProjector projects a window space point (usually based on the mouse location) onto the surface of a sphere with a hyperbolic sheet draped over it. This allows smooth transitions onto and off of the sphere. Two projected points can produce a rotation about the sphere's center. When the mouse position projects on to the sheet, the rotations will be as if the sheet 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.

See Also

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

Definition at line 99 of file SbSphereSheetProjector.h.

Constructor & Destructor Documentation

SbSphereSheetProjector::SbSphereSheetProjector ( SbBool orientToEye = TRUE )

See also:: SbSphereSheetProjector(const SbSphere &sph, SbBool orientToEye)

SbSphereSheetProjector::SbSphereSheetProjector	(	const SbSphere &	sph,
		SbBool	orientToEye = `TRUE`
	)

The first uses a default sphere centered at the origin with radius 1.0; the sphere is supplied in the second. The orientToEye parameter determines whether the sheet is perpendicular to the eye, or perpendicular to the sphere's Z axis. Setting that parameter to TRUE (the default) specifies that the sheet be perpendicular to the eye, which is most often the desired behavior.

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

SbSphereSheetProjector::~SbSphereSheetProjector ( ) [inline]

Definition at line 120 of file SbSphereSheetProjector.h.