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101 lines
4.7 KiB
101 lines
4.7 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_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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