1 // Copyright (C) 2008 Till Busch buti@bux.at
3 // This program is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU General Public License as
5 // published by the Free Software Foundation; either version 2 of the
6 // License, or (at your option) any later version.
8 // This program is distributed in the hope that it will be useful, but
9 // WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program; if not, write to the Free Software
15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 # include <simgear_config.h>
21 #include <osg/Transform>
23 #include <simgear/debug/logstream.hxx>
25 #include "CheckSceneryVisitor.hxx"
26 #include "SGPagedLOD.hxx"
28 #include <simgear/math/SGMath.hxx>
30 using namespace simgear;
32 CheckSceneryVisitor::CheckSceneryVisitor(osgDB::DatabasePager* dbp, const osg::Vec3 &position, double range)
33 :osg::NodeVisitor(osg::NodeVisitor::NODE_VISITOR,
34 osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN),
35 _position(position), _range(range), _loaded(true), _dbp(dbp)
37 _viewMatrices.push_back(osg::Matrix::identity());
40 void CheckSceneryVisitor::apply(osg::Node& node)
45 void CheckSceneryVisitor::apply(osg::PagedLOD& node)
47 SGPagedLOD *sgplod = dynamic_cast<SGPagedLOD*>(&node);
49 osg::Vec3 pos = sgplod->getCenter() * _viewMatrices.back();
50 double dist = (pos-_position).length();
52 if (sgplod->getNumChildren() < 1) {
53 // if the DatabasePager would load LODs while the splashscreen
54 // is there, we could just wait for the models to be loaded
55 // by only setting setLoaded(false) here
56 sgplod->forceLoad(_dbp);
64 void CheckSceneryVisitor::apply(osg::Transform &node)
66 osg::Matrix currMatrix = _viewMatrices.back();
67 bool pushMatrix = node.computeLocalToWorldMatrix(currMatrix, this);
70 _viewMatrices.push_back(currMatrix);
74 _viewMatrices.pop_back();