82ccaa7429
default of 10 if given. This improves performance _a lot_ if massively probing across a bucket border as it prevents constant terrain unloading/reloading.
226 lines
7.7 KiB
C++
226 lines
7.7 KiB
C++
// fgelev.cxx -- compute scenery elevation
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//
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// Copyright (C) 2009 - 2012 Mathias Froehlich
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <iostream>
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#include <cstdlib>
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#include <iomanip>
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#include <osg/ArgumentParser>
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#include <osg/Image>
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#include <simgear/props/props.hxx>
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#include <simgear/props/props_io.hxx>
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#include <simgear/misc/sg_path.hxx>
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#include <simgear/misc/ResourceManager.hxx>
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#include <simgear/bvh/BVHNode.hxx>
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#include <simgear/bvh/BVHLineSegmentVisitor.hxx>
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#include <simgear/bvh/BVHPager.hxx>
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#include <simgear/bvh/BVHPageNode.hxx>
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#include <simgear/scene/material/matlib.hxx>
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#include <simgear/scene/model/BVHPageNodeOSG.hxx>
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#include <simgear/scene/model/ModelRegistry.hxx>
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#include <simgear/scene/util/SGReaderWriterOptions.hxx>
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#include <simgear/scene/util/OptionsReadFileCallback.hxx>
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#include <simgear/scene/tgdb/userdata.hxx>
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namespace sg = simgear;
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class Visitor : public sg::BVHLineSegmentVisitor {
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public:
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Visitor(const SGLineSegmentd& lineSegment, sg::BVHPager& pager) :
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BVHLineSegmentVisitor(lineSegment, 0),
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_pager(pager)
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{ }
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virtual ~Visitor()
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{ }
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virtual void apply(sg::BVHPageNode& node)
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{
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// we have a non threaded pager so load just right here.
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_pager.use(node);
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BVHLineSegmentVisitor::apply(node);
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}
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private:
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sg::BVHPager& _pager;
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};
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// Short circuit reading image files.
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class ReadFileCallback : public sg::OptionsReadFileCallback {
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public:
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virtual ~ReadFileCallback()
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{ }
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virtual osgDB::ReaderWriter::ReadResult readImage(const std::string& name, const osgDB::Options*)
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{ return new osg::Image; }
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};
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static bool
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intersect(sg::BVHNode& node, sg::BVHPager& pager,
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const SGVec3d& start, SGVec3d& end, double offset)
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{
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SGVec3d perp = offset*perpendicular(start - end);
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Visitor visitor(SGLineSegmentd(start + perp, end + perp), pager);
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node.accept(visitor);
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if (visitor.empty())
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return false;
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end = visitor.getLineSegment().getEnd();
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return true;
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}
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int
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main(int argc, char** argv)
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{
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/// Read arguments and environment variables.
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc, argv);
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unsigned expire;
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if (arguments.read("--expire", expire)) {
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} else expire = 10;
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std::string fg_root;
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if (arguments.read("--fg-root", fg_root)) {
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} else if (const char *fg_root_env = std::getenv("FG_ROOT")) {
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fg_root = fg_root_env;
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} else {
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fg_root = PKGLIBDIR;
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}
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std::string fg_scenery;
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if (arguments.read("--fg-scenery", fg_scenery)) {
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} else if (const char *fg_scenery_env = std::getenv("FG_SCENERY")) {
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fg_scenery = fg_scenery_env;
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} else {
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SGPath path(fg_root);
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path.append("Scenery");
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fg_scenery = path.str();
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}
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SGSharedPtr<SGPropertyNode> props = new SGPropertyNode;
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try {
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SGPath preferencesFile = fg_root;
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preferencesFile.append("preferences.xml");
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readProperties(preferencesFile.str(), props);
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} catch (...) {
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// In case of an error, at least make summer :)
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props->getNode("sim/startup/season", true)->setStringValue("summer");
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SG_LOG(SG_GENERAL, SG_ALERT, "Problems loading FlightGear preferences.\n"
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<< "Probably FG_ROOT is not properly set.");
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}
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/// now set up the simgears required model stuff
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simgear::ResourceManager::instance()->addBasePath(fg_root, simgear::ResourceManager::PRIORITY_DEFAULT);
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// Just reference simgears reader writer stuff so that the globals get
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// pulled in by the linker ...
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simgear::ModelRegistry::instance();
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sgUserDataInit(props.get());
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SGMaterialLibPtr ml = new SGMaterialLib;
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SGPath mpath(fg_root);
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mpath.append("Materials/default/materials.xml");
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try {
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ml->load(fg_root, mpath.str(), props);
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} catch (...) {
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SG_LOG(SG_GENERAL, SG_ALERT, "Problems loading FlightGear materials.\n"
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<< "Probably FG_ROOT is not properly set.");
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}
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simgear::SGModelLib::init(fg_root, props);
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// Set up the reader/writer options
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osg::ref_ptr<simgear::SGReaderWriterOptions> options;
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if (osgDB::Options* ropt = osgDB::Registry::instance()->getOptions())
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options = new simgear::SGReaderWriterOptions(*ropt);
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else
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options = new simgear::SGReaderWriterOptions;
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osgDB::convertStringPathIntoFilePathList(fg_scenery,
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options->getDatabasePathList());
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options->setMaterialLib(ml);
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options->setPropertyNode(props);
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options->setReadFileCallback(new ReadFileCallback);
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options->setPluginStringData("SimGear::FG_ROOT", fg_root);
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// we do not need the builtin boundingvolumes
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options->setPluginStringData("SimGear::BOUNDINGVOLUMES", "OFF");
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// And we only want terrain, no objects on top.
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options->setPluginStringData("SimGear::FG_ONLY_TERRAIN", "ON");
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props->getNode("sim/rendering/random-objects", true)->setBoolValue(false);
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props->getNode("sim/rendering/random-vegetation", true)->setBoolValue(false);
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// Here, all arguments are processed
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arguments.reportRemainingOptionsAsUnrecognized();
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arguments.writeErrorMessages(std::cerr);
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// Get the whole world bvh tree
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SGSharedPtr<sg::BVHNode> node;
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node = sg::BVHPageNodeOSG::load("w180s90-360x180.spt", options);
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// if no model has been successfully loaded report failure.
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if (!node.valid()) {
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SG_LOG(SG_GENERAL, SG_ALERT, arguments.getApplicationName()
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<< ": No data loaded");
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return EXIT_FAILURE;
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}
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// We assume that the above is a paged database.
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sg::BVHPager pager;
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while (std::cin.good()) {
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// Increment the paging relevant number
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pager.setUseStamp(1 + pager.getUseStamp());
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// and expire everything not accessed for the past 30 requests
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pager.update(expire);
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std::string id;
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std::cin >> id;
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double lon, lat;
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std::cin >> lon >> lat;
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if (std::cin.fail())
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return EXIT_FAILURE;
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std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
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SGVec3d start = SGVec3d::fromGeod(SGGeod::fromDegM(lon, lat, 10000));
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SGVec3d end = SGVec3d::fromGeod(SGGeod::fromDegM(lon, lat, -1000));
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// Try to find an intersection
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bool found = intersect(*node, pager, start, end, 0);
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double scale = 1e-5;
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while (!found && scale <= 1) {
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found = intersect(*node, pager, start, end, scale);
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scale *= 2;
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}
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if (1e-5 < scale)
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std::cerr << "Found hole of minimum diameter "
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<< scale << "m at lon = " << lon
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<< "deg lat = " << lat << "deg" << std::endl;
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std::cout << id << ": ";
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if (!found) {
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std::cout << "-1000" << std::endl;
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} else {
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SGGeod geod = SGGeod::fromCart(end);
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std::cout << std::fixed << std::setprecision(3) << geod.getElevationM() << std::endl;
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}
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}
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return EXIT_SUCCESS;
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}
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