102 lines
4.6 KiB
C++
102 lines
4.6 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_ELEVATIONSLICE
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#define OSGSIM_ELEVATIONSLICE 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 ElevationSlice
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{
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public :
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ElevationSlice();
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/** Set the start point of the slice.*/
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void setStartPoint(const osg::Vec3d& startPoint) { _startPoint = startPoint; }
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/** Get the start point of the slice.*/
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const osg::Vec3d& getStartPoint() const { return _startPoint; }
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/** Set the end point of the slice.*/
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void setEndPoint(const osg::Vec3d& endPoint) { _endPoint = endPoint; }
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/** Get the end point of the slice.*/
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const osg::Vec3d& getEndPoint() const { return _endPoint; }
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typedef std::vector<osg::Vec3d> Vec3dList;
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/** Get the intersections in the form of a vector of Vec3d. */
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const Vec3dList& getIntersections() const { return _intersections; }
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typedef std::pair<double,double> DistanceHeight;
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typedef std::vector<DistanceHeight> DistanceHeightList;
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/** Get the intersections in the form a vector of pair<double,double> representing distance along the slice and height. */
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const DistanceHeightList& getDistanceHeightIntersections() const { return _distanceHeightIntersections; }
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/** Compute the intersections with the specified scene graph, the results are stored in vectors of Vec3d.
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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 Vec3dList computeElevationSlice(osg::Node* scene, const osg::Vec3d& startPoint, const osg::Vec3d& endPoint, 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 ElevationSlice 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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osg::Vec3d _startPoint;
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osg::Vec3d _endPoint;
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Vec3dList _intersections;
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DistanceHeightList _distanceHeightIntersections;
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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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