SbSpherePlaneProjector Class Reference
[Projectors]

Sphere-plane projector. More...

#include <Inventor/projectors/SbSpherePlaneProjector.h>

Inheritance diagram for SbSpherePlaneProjector:
SbSphereSectionProjector SbSphereProjector SbProjector

List of all members.

Public Member Functions

 SbSpherePlaneProjector (float edgeTol=0.9f, SbBool orientToEye=TRUE)
 SbSpherePlaneProjector (const SbSphere &sph, float edgeTol=0.9f, SbBool orientToEye=TRUE)
 ~SbSpherePlaneProjector ()
virtual SbProjectorcopy () const
virtual SbVec3f project (const SbVec2f &point)
virtual SbVec3f intersect (const SbLine &line)
virtual SbRotation getRotation (const SbVec3f &point1, const SbVec3f &point2)

Detailed Description

Sphere-plane projector.

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.

SEE ALSO

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


Constructor & Destructor Documentation

SbSpherePlaneProjector::SbSpherePlaneProjector ( 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 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.

SbSpherePlaneProjector::SbSpherePlaneProjector ( const SbSphere sph,
float  edgeTol = 0.9f,
SbBool  orientToEye = TRUE 
)

Constructor that uses a supplied sphere.

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 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.

SbSpherePlaneProjector::~SbSpherePlaneProjector (  )  [inline]

Destructor.


Member Function Documentation

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

Returns an instance that is a copy of this instance.

The caller is responsible for deleting the copy when done.

Reimplemented from SbSphereSectionProjector.

virtual SbRotation SbSpherePlaneProjector::getRotation ( const SbVec3f point1,
const SbVec3f point2 
) [virtual]

Computes a rotation based on two points on this projector.

Reimplemented from SbSphereSectionProjector.

virtual SbVec3f SbSpherePlaneProjector::intersect ( const SbLine line  )  [virtual]

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

New for v3.0.

Reimplemented from SbSphereSectionProjector.

virtual SbVec3f SbSpherePlaneProjector::project ( const SbVec2f point  )  [virtual]

Apply 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.

Reimplemented from SbSphereSectionProjector.


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

Open Inventor Toolkit reference manual, generated on 15 Mar 2023
Copyright © Thermo Fisher Scientific All rights reserved.
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