OpenSceneGraph  3.4.0
Classes | Public Types | Public Member Functions | Protected Member Functions | Protected Attributes
osgUtil::RayIntersector Class Reference

RayIntersector implements possibly-infinite line intersections with the scene graph. More...

Inheritance diagram for osgUtil::RayIntersector:
Inheritance graph
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List of all members.

Classes

struct  Intersection

Public Types

typedef std::multiset
< Intersection
Intersections

Public Member Functions

 RayIntersector (CoordinateFrame cf=MODEL, RayIntersector *parent=NULL, osgUtil::Intersector::IntersectionLimit intersectionLimit=osgUtil::Intersector::NO_LIMIT)
 Construct a RayIntersector.
 RayIntersector (const osg::Vec3d &start, const osg::Vec3d &direction)
 Construct a RayIntersector that runs from start point in specified direction to the infinity.
 RayIntersector (CoordinateFrame cf, const osg::Vec3d &start, const osg::Vec3d &direction, RayIntersector *parent=NULL, osgUtil::Intersector::IntersectionLimit intersectionLimit=osgUtil::Intersector::NO_LIMIT)
 Construct a RayIntersector the runs from start point in specified direction to the infinity in the specified coordinate frame.
 RayIntersector (CoordinateFrame cf, double x, double y)
 Convenience constructor for supporting picking in WINDOW and PROJECTION coordinates.
void insertIntersection (const Intersection &intersection)
IntersectionsgetIntersections ()
Intersection getFirstIntersection ()
virtual void setStart (const osg::Vec3d &start)
const osg::Vec3dgetStart () const
virtual void setDirection (const osg::Vec3d &dir)
const osg::Vec3dgetDirection () const
virtual Intersectorclone (osgUtil::IntersectionVisitor &iv)
virtual bool enter (const osg::Node &node)
virtual void leave ()
virtual void intersect (osgUtil::IntersectionVisitor &iv, osg::Drawable *drawable)
virtual void reset ()
virtual bool containsIntersections ()

Protected Member Functions

virtual bool intersects (const osg::BoundingSphere &bs)
bool intersectAndClip (osg::Vec3d &s, const osg::Vec3d &d, osg::Vec3d &e, const osg::BoundingBox &bb)

Protected Attributes

RayIntersector_parent
osg::Vec3d _start
osg::Vec3d _direction
Intersections _intersections

Detailed Description

RayIntersector implements possibly-infinite line intersections with the scene graph.

Compared with LineSegmentIntersector, RayIntersector supports infinite intersection lines, start and end point can be given in homogeneous coordinates and projection matrix is allowed to have z-far plane at infinity (often used in shadow volume technique).

Currently, picking of objects at infinity is not supported. Please, contribute.

The class is be used in conjunction with IntersectionVisitor.


Member Typedef Documentation


Constructor & Destructor Documentation

Construct a RayIntersector.

You will need to provide start and end point, or start point and direction. See setStart() and setDirecton().

osgUtil::RayIntersector::RayIntersector ( const osg::Vec3d start,
const osg::Vec3d direction 
)

Construct a RayIntersector that runs from start point in specified direction to the infinity.

Start and direction are provided in MODEL coordinates.

Construct a RayIntersector the runs from start point in specified direction to the infinity in the specified coordinate frame.

osgUtil::RayIntersector::RayIntersector ( CoordinateFrame  cf,
double  x,
double  y 
)

Convenience constructor for supporting picking in WINDOW and PROJECTION coordinates.

In WINDOW coordinates, it creates a start value of (x,y,0) and end value of (x,y,1). In PROJECTION coordinates (clip space cube), it creates a start value of (x,y,-1) and end value of (x,y,1). In VIEW and MODEL coordinates, it creates a start value of (x,y,0) and end value of (x,y,1).


Member Function Documentation

Implements osgUtil::Intersector.

virtual bool osgUtil::RayIntersector::containsIntersections ( ) [inline, virtual]

Implements osgUtil::Intersector.

virtual bool osgUtil::RayIntersector::enter ( const osg::Node node) [virtual]

Implements osgUtil::Intersector.

const osg::Vec3d& osgUtil::RayIntersector::getStart ( ) const [inline]
void osgUtil::RayIntersector::insertIntersection ( const Intersection intersection) [inline]
virtual void osgUtil::RayIntersector::intersect ( osgUtil::IntersectionVisitor iv,
osg::Drawable drawable 
) [virtual]

Implements osgUtil::Intersector.

bool osgUtil::RayIntersector::intersectAndClip ( osg::Vec3d s,
const osg::Vec3d d,
osg::Vec3d e,
const osg::BoundingBox bb 
) [protected]
virtual bool osgUtil::RayIntersector::intersects ( const osg::BoundingSphere bs) [protected, virtual]
virtual void osgUtil::RayIntersector::leave ( ) [virtual]

Implements osgUtil::Intersector.

virtual void osgUtil::RayIntersector::reset ( ) [virtual]

Reimplemented from osgUtil::Intersector.

virtual void osgUtil::RayIntersector::setDirection ( const osg::Vec3d dir) [inline, virtual]
virtual void osgUtil::RayIntersector::setStart ( const osg::Vec3d start) [inline, virtual]

Member Data Documentation


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

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Generated at Tue Dec 8 2015 00:16:51 for the OpenSceneGraph by doxygen 1.7.6.1.