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