OpenSceneGraph  3.5.1
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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::Vec3dIntersections
 

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::Vec3dgetStartPoint (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::Vec3dgetEndPoint (unsigned int i) const
 Get the end point of single line of sight test. More...
 
const IntersectionsgetIntersections (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...
 
DatabaseCacheReadCallbackgetDatabaseCacheReadCallback ()
 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< LOSLOSList
 

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<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:

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Generated at Wed Nov 11 2015 22:15:10 for the OpenSceneGraph by doxygen 1.8.10.