osgSim::LineOfSight Class Reference

Helper class for setting up and acquiring line of sight intersections with terrain. More...

Classes
struct	LOS

Public Types
typedef std::vector< osg::Vec3d >	Intersections

Public Member Functions
	LineOfSight ()
void	clear ()
	Clear the internal LOS List so it contains no line of sight tests. More...
unsigned int	addLOS (const osg::Vec3d &start, const osg::Vec3d &end)
	Add a line of sight test, consisting of start and end point. More...
unsigned int	getNumLOS () const
	Get the number of line of sight tests. More...
void	setStartPoint (unsigned int i, const osg::Vec3d &start)
	Set the start point of single line of sight test. More...
const osg::Vec3d &	getStartPoint (unsigned int i) const
	Get the start point of single line of sight test. More...
void	setEndPoint (unsigned int i, const osg::Vec3d &end)
	Set the end point of single line of sight test. More...
const osg::Vec3d &	getEndPoint (unsigned int i) const
	Get the end point of single line of sight test. More...
const Intersections &	getIntersections (unsigned int i) const
	Get the intersection points for a single line of sight test. More...
void	computeIntersections (osg::Node *scene, osg::Node::NodeMask traversalMask=0xffffffff)
	Compute the LOS intersections with the specified scene graph. More...
void	clearDatabaseCache ()
	Clear the database cache. More...
void	setDatabaseCacheReadCallback (DatabaseCacheReadCallback *dcrc)
	Set the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs. More...
DatabaseCacheReadCallback *	getDatabaseCacheReadCallback ()
	Get the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs. More...

Static Public Member Functions
static Intersections	computeIntersections (osg::Node *scene, const osg::Vec3d &start, const osg::Vec3d &end, osg::Node::NodeMask traversalMask=0xffffffff)
	Compute the intersection between the specified scene graph and a single LOS start,end pair. More...

Protected Types
typedef std::vector< LOS >	LOSList

Protected Attributes
LOSList	_LOSList
osg::ref_ptr< DatabaseCacheReadCallback >	_dcrc
osgUtil::IntersectionVisitor	_intersectionVisitor

Detailed Description

Helper class for setting up and acquiring line of sight intersections with terrain.

By default assigns a osgSim::DatabaseCacheReadCallback that enables automatic loading of external PagedLOD tiles to ensure that the highest level of detail is used in intersections. This automatic loading of tiles is done by the intersection traversal that is done within the computeIntersections(..) method, so can result in long intersection times when external tiles have to be loaded. The external loading of tiles can be disabled by removing the read callback, this is done by calling the setDatabaseCacheReadCallback(DatabaseCacheReadCallback*) method with a value of 0.

Member Typedef Documentation

typedef std::vector<osg::Vec3d> osgSim::LineOfSight::Intersections

typedef std::vector<LOS> osgSim::LineOfSight::LOSList

protected

Constructor & Destructor Documentation

osgSim::LineOfSight::LineOfSight

(

)

Member Function Documentation

unsigned int osgSim::LineOfSight::addLOS	(	const osg::Vec3d &	start,
		const osg::Vec3d &	end
	)

Add a line of sight test, consisting of start and end point.

Returns the index number of the newly adding LOS test.

void osgSim::LineOfSight::clear

(

)

Clear the internal LOS List so it contains no line of sight tests.

void osgSim::LineOfSight::clearDatabaseCache ( )

inline

Clear the database cache.

void osgSim::LineOfSight::computeIntersections	(	osg::Node *	scene,
		osg::Node::NodeMask	traversalMask = 0xffffffff
	)

Compute the LOS intersections with the specified scene graph.

The results are all stored in the form of Intersections list, one per LOS test.

static Intersections osgSim::LineOfSight::computeIntersections ( osg::Node *  scene, const osg::Vec3d &  start, const osg::Vec3d &  end, osg::Node::NodeMask  traversalMask = 0xffffffff  )

static

Compute the intersection between the specified scene graph and a single LOS start,end pair.

Returns an IntersectionList, of all the points intersected.

DatabaseCacheReadCallback* osgSim::LineOfSight::getDatabaseCacheReadCallback ( )

inline

Get the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.

const osg::Vec3d& osgSim::LineOfSight::getEndPoint ( unsigned int  i ) const

inline

Get the end point of single line of sight test.

const Intersections& osgSim::LineOfSight::getIntersections ( unsigned int  i ) const

inline

Get the intersection points for a single line of sight test.

unsigned int osgSim::LineOfSight::getNumLOS ( ) const

inline

Get the number of line of sight tests.

const osg::Vec3d& osgSim::LineOfSight::getStartPoint ( unsigned int  i ) const

inline

Get the start point of single line of sight test.

void osgSim::LineOfSight::setDatabaseCacheReadCallback

(

DatabaseCacheReadCallback *

dcrc

)

Set the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.

Note, if you have multiple LineOfSight or HeightAboveTerrain objects in use at one time then you should share a single DatabaseCacheReadCallback between all of them.

void osgSim::LineOfSight::setEndPoint ( unsigned int  i, const osg::Vec3d &  end  )

inline

Set the end point of single line of sight test.

void osgSim::LineOfSight::setStartPoint ( unsigned int  i, const osg::Vec3d &  start  )

inline

Set the start point of single line of sight test.

Member Data Documentation

osg::ref_ptr<DatabaseCacheReadCallback> osgSim::LineOfSight::_dcrc

protected

osgUtil::IntersectionVisitor osgSim::LineOfSight::_intersectionVisitor

protected

LOSList osgSim::LineOfSight::_LOSList

protected

---

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

• osgSim/LineOfSight