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- /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
- *
- * This library is open source and may be redistributed and/or modified under
- * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
- * (at your option) any later version. The full license is in LICENSE file
- * included with this distribution, and on the openscenegraph.org website.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * OpenSceneGraph Public License for more details.
- */
- #ifndef OSGSIM_LINEOFSIGHT
- #define OSGSIM_LINEOFSIGHT 1
- #include <osgUtil/IntersectionVisitor>
- #include <osgSim/Export>
- namespace osgSim {
- class OSGSIM_EXPORT DatabaseCacheReadCallback : public osgUtil::IntersectionVisitor::ReadCallback
- {
- public:
- DatabaseCacheReadCallback();
- void setMaximumNumOfFilesToCache(unsigned int maxNumFilesToCache) { _maxNumFilesToCache = maxNumFilesToCache; }
- unsigned int getMaximumNumOfFilesToCache() const { return _maxNumFilesToCache; }
- void clearDatabaseCache();
- void pruneUnusedDatabaseCache();
- virtual osg::ref_ptr<osg::Node> readNodeFile(const std::string& filename);
- protected:
- typedef std::map<std::string, osg::ref_ptr<osg::Node> > FileNameSceneMap;
- unsigned int _maxNumFilesToCache;
- OpenThreads::Mutex _mutex;
- FileNameSceneMap _filenameSceneMap;
- };
- /** 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.*/
- class OSGSIM_EXPORT LineOfSight
- {
- public :
- LineOfSight();
- /** Clear the internal LOS List so it contains no line of sight tests.*/
- void clear();
- /** Add a line of sight test, consisting of start and end point. Returns the index number of the newly adding LOS test.*/
- unsigned int addLOS(const osg::Vec3d& start, const osg::Vec3d& end);
- /** Get the number of line of sight tests.*/
- unsigned int getNumLOS() const { return _LOSList.size(); }
- /** Set the start point of single line of sight test.*/
- void setStartPoint(unsigned int i, const osg::Vec3d& start) { _LOSList[i]._start = start; }
- /** Get the start point of single line of sight test.*/
- const osg::Vec3d& getStartPoint(unsigned int i) const { return _LOSList[i]._start; }
- /** Set the end point of single line of sight test.*/
- void setEndPoint(unsigned int i, const osg::Vec3d& end) { _LOSList[i]._end = end; }
- /** Get the end point of single line of sight test.*/
- const osg::Vec3d& getEndPoint(unsigned int i) const { return _LOSList[i]._end; }
- typedef std::vector<osg::Vec3d> Intersections;
- /** Get the intersection points for a single line of sight test.*/
- const Intersections& getIntersections(unsigned int i) const { return _LOSList[i]._intersections; }
- /** Compute the LOS intersections with the specified scene graph.
- * The results are all stored in the form of Intersections list, one per LOS test.*/
- void computeIntersections(osg::Node* scene, osg::Node::NodeMask traversalMask=0xffffffff);
- /** Compute the intersection between the specified scene graph and a single LOS start,end pair. Returns an IntersectionList, of all the points intersected.*/
- static Intersections computeIntersections(osg::Node* scene, const osg::Vec3d& start, const osg::Vec3d& end, osg::Node::NodeMask traversalMask=0xffffffff);
- /** Clear the database cache.*/
- void clearDatabaseCache() { if (_dcrc.valid()) _dcrc->clearDatabaseCache(); }
- /** 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 setDatabaseCacheReadCallback(DatabaseCacheReadCallback* dcrc);
- /** Get the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.*/
- DatabaseCacheReadCallback* getDatabaseCacheReadCallback() { return _dcrc.get(); }
- protected :
- struct LOS
- {
- LOS(const osg::Vec3d& start, const osg::Vec3d& end):
- _start(start),
- _end(end) {}
- osg::Vec3d _start;
- osg::Vec3d _end;
- Intersections _intersections;
- };
- typedef std::vector<LOS> LOSList;
- LOSList _LOSList;
- osg::ref_ptr<DatabaseCacheReadCallback> _dcrc;
- osgUtil::IntersectionVisitor _intersectionVisitor;
- };
- }
- #endif
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