OpenSceneGraph  3.0.1
Classes | Public Types | Public Member Functions | Static Public Member Functions | Protected Types | Protected Attributes
osgSim::LineOfSight Class Reference

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

List of all members.

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.
unsigned int addLOS (const osg::Vec3d &start, const osg::Vec3d &end)
 Add a line of sight test, consisting of start and end point.
unsigned int getNumLOS () const
 Get the number of line of sight tests.
void setStartPoint (unsigned int i, const osg::Vec3d &start)
 Set the start point of single line of sight test.
const osg::Vec3dgetStartPoint (unsigned int i) const
 Get the start point of single line of sight test.
void setEndPoint (unsigned int i, const osg::Vec3d &end)
 Set the end point of single line of sight test.
const osg::Vec3dgetEndPoint (unsigned int i) const
 Get the end point of single line of sight test.
const IntersectionsgetIntersections (unsigned int i) const
 Get the intersection points for a single line of sight test.
void computeIntersections (osg::Node *scene, osg::Node::NodeMask traversalMask=0xffffffff)
 Compute the LOS intersections with the specified scene graph.
void clearDatabaseCache ()
 Clear the database cache.
void setDatabaseCacheReadCallback (DatabaseCacheReadCallback *dcrc)
 Set the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.
DatabaseCacheReadCallbackgetDatabaseCacheReadCallback ()
 Get the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.

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.

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


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

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Generated at Mon Oct 3 2011 12:39:49 for the OpenSceneGraph by doxygen 1.7.5.