root/OpenSceneGraph/trunk/include/osgSim/LineOfSight @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSGSIM_LINEOFSIGHT
15#define OSGSIM_LINEOFSIGHT 1
16
17#include <osgUtil/IntersectionVisitor>
18
19#include <osgSim/Export>
20
21namespace osgSim {
22
23class OSGSIM_EXPORT DatabaseCacheReadCallback : public osgUtil::IntersectionVisitor::ReadCallback
24{
25    public:
26        DatabaseCacheReadCallback();
27
28        void setMaximumNumOfFilesToCache(unsigned int maxNumFilesToCache) { _maxNumFilesToCache = maxNumFilesToCache; }
29        unsigned int  getMaximumNumOfFilesToCache() const { return _maxNumFilesToCache; }
30
31        void clearDatabaseCache();
32
33        void pruneUnusedDatabaseCache();
34
35        virtual osg::Node* readNodeFile(const std::string& filename);
36
37    protected:
38
39        typedef std::map<std::string, osg::ref_ptr<osg::Node> > FileNameSceneMap;
40
41        unsigned int _maxNumFilesToCache;
42        OpenThreads::Mutex  _mutex;
43        FileNameSceneMap    _filenameSceneMap;
44};
45
46/** Helper class for setting up and acquiring line of sight intersections with terrain.
47  * By default assigns a osgSim::DatabaseCacheReadCallback that enables automatic loading
48  * of external PagedLOD tiles to ensure that the highest level of detail is used in intersections.
49  * This automatic loading of tiles is done by the intersection traversal that is done within
50  * the computeIntersections(..) method, so can result in long intersection times when external
51  * tiles have to be loaded.
52  * The external loading of tiles can be disabled by removing the read callback, this is done by
53  * calling the setDatabaseCacheReadCallback(DatabaseCacheReadCallback*) method with a value of 0.*/
54class OSGSIM_EXPORT LineOfSight
55{
56    public :
57
58        LineOfSight();
59
60        /** Clear the internal LOS List so it contains no line of sight tests.*/
61        void clear();
62
63        /** Add a line of sight test, consisting of start and end point. Returns the index number of the newly adding LOS test.*/
64        unsigned int addLOS(const osg::Vec3d& start, const osg::Vec3d& end);
65
66        /** Get the number of line of sight tests.*/
67        unsigned int getNumLOS() const { return _LOSList.size(); }
68
69        /** Set the start point of single line of sight test.*/
70        void setStartPoint(unsigned int i, const osg::Vec3d& start) { _LOSList[i]._start = start; }
71
72        /** Get the start point of single line of sight test.*/
73        const osg::Vec3d& getStartPoint(unsigned int i) const { return _LOSList[i]._start; }
74
75        /** Set the end point of single line of sight test.*/
76        void setEndPoint(unsigned int i, const osg::Vec3d& end) { _LOSList[i]._end = end; }
77
78        /** Get the end point of single line of sight test.*/
79        const osg::Vec3d& getEndPoint(unsigned int i) const { return _LOSList[i]._end; }
80
81        typedef std::vector<osg::Vec3d> Intersections;
82
83        /** Get the intersection points for a single line of sight test.*/
84        const Intersections& getIntersections(unsigned int i) const  { return _LOSList[i]._intersections; }
85
86        /** Compute the LOS intersections with the specified scene graph.
87          * The results are all stored in the form of Intersections list, one per LOS test.*/
88        void computeIntersections(osg::Node* scene, osg::Node::NodeMask traversalMask=0xffffffff);
89
90        /** Compute the intersection between the specified scene graph and a single LOS start,end pair. Returns an IntersectionList, of all the points intersected.*/
91        static Intersections computeIntersections(osg::Node* scene, const osg::Vec3d& start, const osg::Vec3d& end, osg::Node::NodeMask traversalMask=0xffffffff);
92
93
94        /** Clear the database cache.*/
95        void clearDatabaseCache() { if (_dcrc.valid()) _dcrc->clearDatabaseCache(); }
96
97        /** Set the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.
98          * Note, if you have multiple LineOfSight or HeightAboveTerrain objects in use at one time then you should share a single
99          * DatabaseCacheReadCallback between all of them. */
100        void setDatabaseCacheReadCallback(DatabaseCacheReadCallback* dcrc);
101
102        /** Get the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.*/
103        DatabaseCacheReadCallback* getDatabaseCacheReadCallback() { return _dcrc.get(); }
104
105    protected :
106
107        struct LOS
108        {
109            LOS(const osg::Vec3d& start, const osg::Vec3d& end):
110                _start(start),
111                _end(end) {}
112
113
114            osg::Vec3d      _start;
115            osg::Vec3d      _end;
116            Intersections   _intersections;
117        };
118
119        typedef std::vector<LOS> LOSList;
120        LOSList _LOSList;
121
122        osg::ref_ptr<DatabaseCacheReadCallback> _dcrc;
123        osgUtil::IntersectionVisitor            _intersectionVisitor;
124
125};
126
127}
128
129#endif
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