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129 lines
5.4 KiB
129 lines
5.4 KiB
/* -*-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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