SbSpherePlaneProjector Class Reference
[Projectors]
Sphere-plane projector. More...
#include <Inventor/projectors/SbSpherePlaneProjector.h>
Public Member Functions | |
| SbSpherePlaneProjector (float edgeTol=0.9f, SbBool orientToEye=TRUE) | |
| SbSpherePlaneProjector (const SbSphere &sph, float edgeTol=0.9f, SbBool orientToEye=TRUE) | |
| ~SbSpherePlaneProjector () | |
| virtual SbProjector * | copy () 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.
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.
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:
- Inventor/projectors/SbSpherePlaneProjector.h