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116 lines
5.2 KiB
116 lines
5.2 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_HEIGHTABOVETERRAIN |
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#define OSGSIM_HEIGHTABOVETERRAIN 1 |
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#include <osgUtil/IntersectionVisitor> |
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// include so we can get access to the DatabaseCacheReadCallback |
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#include <osgSim/LineOfSight> |
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namespace osgSim { |
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/** Helper class for setting up and acquiring height above terrain 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 HeightAboveTerrain |
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{ |
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public : |
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HeightAboveTerrain(); |
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/** Clear the internal HAT List so it contains no height above terrain tests.*/ |
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void clear(); |
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/** Add a height above terrain test point in the CoordinateFrame.*/ |
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unsigned int addPoint(const osg::Vec3d& point); |
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/** Get the number of height above terrain tests.*/ |
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unsigned int getNumPoints() const { return _HATList.size(); } |
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/** Set the source point of single height above terrain test.*/ |
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void setPoint(unsigned int i, const osg::Vec3d& point) { _HATList[i]._point = point; } |
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/** Get the source point of single height above terrain test.*/ |
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const osg::Vec3d& getPoint(unsigned int i) const { return _HATList[i]._point; } |
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/** Get the intersection height for a single height above terrain test. |
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* Note, you must call computeIntersections(..) before you can query the HeightAboveTerrain. |
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* If no intersections are found then height returned will be the height above mean sea level. */ |
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double getHeightAboveTerrain(unsigned int i) const { return _HATList[i]._hat; } |
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/** Set the lowest height that the should be tested for. |
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* Defaults to -1000, i.e. 1000m below mean sea level. */ |
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void setLowestHeight(double lowestHeight) { _lowestHeight = lowestHeight; } |
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/** Get the lowest height that the should be tested for.*/ |
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double getLowestHeight() const { return _lowestHeight; } |
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/** Compute the HAT intersections with the specified scene graph. |
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* The results are all stored in the form of a single height above terrain value per HAT test. |
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* Note, if the topmost node is a CoordinateSystemNode then the input points are assumed to be geocentric, |
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* with the up vector defined by the EllipsoidModel attached to the CoordinateSystemNode. |
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* If the topmost node is not a CoordinateSystemNode then a local coordinates frame is assumed, with a local up vector. */ |
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void computeIntersections(osg::Node* scene, osg::Node::NodeMask traversalMask=0xffffffff); |
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/** Compute the vertical distance between the specified scene graph and a single HAT point. */ |
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static double computeHeightAboveTerrain(osg::Node* scene, const osg::Vec3d& point, 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 HAT |
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{ |
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HAT(const osg::Vec3d& point): |
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_point(point), |
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_hat(0.0) {} |
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osg::Vec3d _point; |
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double _hat; |
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}; |
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typedef std::vector<HAT> HATList; |
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double _lowestHeight; |
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HATList _HATList; |
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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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