117 lines
5.1 KiB
C++
117 lines
5.1 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_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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