osgUtil::IntersectVisitor Class Reference

Basic visitor for ray based collisions of a scene. More...

Inheritance diagram for osgUtil::IntersectVisitor:

[legend]List of all members.


Public Types
typedef std::vector< Hit >	HitList
typedef std::map< const osg::LineSegment *, HitList >	LineSegmentHitListMap
enum	LODSelectionMode { USE_HEIGHEST_LEVEL_OF_DETAIL, USE_SEGMENT_START_POINT_AS_EYE_POINT_FOR_LOD_LEVEL_SELECTION }
Public Member Functions
	IntersectVisitor ()
virtual	~IntersectVisitor ()
void	reset ()
	Method to call to reset visitor.
void	addLineSegment (osg::LineSegment *seg)
	Add a line segment to use for intersection testing during scene traversal.
HitList &	getHitList (const osg::LineSegment *seg)
int	getNumHits (const osg::LineSegment *seg)
bool	hits ()
void	setLODSelectionMode (LODSelectionMode mode)
LODSelectionMode	getLODSelectionMode () const
void	setEyePoint (const osg::Vec3 &eye)
	Set the eye point in local coordinates.
virtual osg::Vec3	getEyePoint () const
	Get the eye point in local coordinates.
virtual float	getDistanceToEyePoint (const osg::Vec3 &pos, bool withLODScale) const
	Get the distance from a point to the eye point, distance value in local coordinate system.
virtual void	apply (osg::Node &)
virtual void	apply (osg::Geode &node)
virtual void	apply (osg::Billboard &node)
virtual void	apply (osg::Group &node)
virtual void	apply (osg::Transform &node)
virtual void	apply (osg::Switch &node)
virtual void	apply (osg::LOD &node)
Protected Types
typedef std::vector< osg::ref_ptr< IntersectState > >	IntersectStateStack
Protected Member Functions
bool	intersect (osg::Drawable &gset)
void	pushMatrix (const osg::Matrix &matrix)
void	popMatrix ()
bool	enterNode (osg::Node &node)
void	leaveNode ()
Protected Attributes
IntersectStateStack	_intersectStateStack
LineSegmentHitListMap	_segHitList
LODSelectionMode	_lodSelectionMode
osg::Vec3	_pseudoEyePoint

Detailed Description

Basic visitor for ray based collisions of a scene.

Member Typedef Documentation

typedef std::vector<Hit> osgUtil::IntersectVisitor::HitList

typedef std::vector<osg::ref_ptr<IntersectState> > osgUtil::IntersectVisitor::IntersectStateStack [protected]

typedef std::map<const osg::LineSegment*,HitList > osgUtil::IntersectVisitor::LineSegmentHitListMap

Member Enumeration Documentation

enum osgUtil::IntersectVisitor::LODSelectionMode

Enumeration values:

USE_HEIGHEST_LEVEL_OF_DETAIL

USE_SEGMENT_START_POINT_AS_EYE_POINT_FOR_LOD_LEVEL_SELECTION

Constructor & Destructor Documentation

osgUtil::IntersectVisitor::IntersectVisitor ( )

virtual osgUtil::IntersectVisitor::~IntersectVisitor ( ) [virtual]

Member Function Documentation

void osgUtil::IntersectVisitor::addLineSegment ( osg::LineSegment * seg )

Add a line segment to use for intersection testing during scene traversal.
Note, a maximum of 32 line segments can be added to a IntersectVistor, adding more than this will result in warning being emitted to the console and the excess segments being ignored.

virtual void osgUtil::IntersectVisitor::apply ( osg::LOD & node ) [virtual]

Reimplemented from osg::NodeVisitor.

virtual void osgUtil::IntersectVisitor::apply ( osg::Switch & node ) [virtual]

Reimplemented from osg::NodeVisitor.

virtual void osgUtil::IntersectVisitor::apply ( osg::Transform & node ) [virtual]

Reimplemented from osg::NodeVisitor.

virtual void osgUtil::IntersectVisitor::apply ( osg::Group & node ) [virtual]

Reimplemented from osg::NodeVisitor.

virtual void osgUtil::IntersectVisitor::apply ( osg::Billboard & node ) [virtual]

Reimplemented from osg::NodeVisitor.

virtual void osgUtil::IntersectVisitor::apply ( osg::Geode & node ) [virtual]

Reimplemented from osg::NodeVisitor.

virtual void osgUtil::IntersectVisitor::apply ( osg::Node & ) [virtual]

Reimplemented from osg::NodeVisitor.

bool osgUtil::IntersectVisitor::enterNode ( osg::Node & node ) [protected]

virtual float osgUtil::IntersectVisitor::getDistanceToEyePoint ( const osg::Vec3 & pos,

bool withLODScale

) const [virtual]

Get the distance from a point to the eye point, distance value in local coordinate system.
This is calculated using the pseudo-EyePoint (above) when doing LOD calculcations.

virtual osg::Vec3 osgUtil::IntersectVisitor::getEyePoint ( ) const [inline, virtual]

Get the eye point in local coordinates.
Note, not all NodeVisitor implement this method, it is mainly cull visitors which will implement.
Reimplemented from osg::NodeVisitor.

HitList& osgUtil::IntersectVisitor::getHitList ( const osg::LineSegment * seg ) [inline]

LODSelectionMode osgUtil::IntersectVisitor::getLODSelectionMode ( ) const [inline]

int osgUtil::IntersectVisitor::getNumHits ( const osg::LineSegment * seg ) [inline]

bool osgUtil::IntersectVisitor::hits ( )

bool osgUtil::IntersectVisitor::intersect ( osg::Drawable & gset ) [protected]

void osgUtil::IntersectVisitor::leaveNode ( ) [protected]

void osgUtil::IntersectVisitor::popMatrix ( ) [protected]

void osgUtil::IntersectVisitor::pushMatrix ( const osg::Matrix & matrix ) [protected]

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

Method to call to reset visitor.
Useful if your visitor accumulates state during a traversal, and you plan to reuse the visitor. To flush that state for the next traversal: call reset() prior to each traversal.
Reimplemented from osg::NodeVisitor.

void osgUtil::IntersectVisitor::setEyePoint ( const osg::Vec3 & eye ) [inline]

Set the eye point in local coordinates.
This is a pseudo-EyePoint for billboarding and LOD purposes. It is copied from the Start point of the most-recently-added segment of the intersection ray set (IntersectState::_segList).