rtabmap/tools/Reprocess/main.cpp

/*
Copyright (c) 2010-2016, Mathieu Labbe - IntRoLab - Universite de Sherbrooke
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the Universite de Sherbrooke nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <rtabmap/core/Rtabmap.h>
#include <rtabmap/core/DBDriver.h>
#include <rtabmap/core/DBReader.h>
#ifdef RTABMAP_OCTOMAP
#include <rtabmap/core/OctoMap.h>
#endif
#include <rtabmap/core/OccupancyGrid.h>
#include <rtabmap/utilite/UFile.h>
#include <rtabmap/utilite/UDirectory.h>
#include <rtabmap/utilite/UTimer.h>
#include <rtabmap/utilite/UStl.h>
#include <rtabmap/utilite/UMath.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pcl/io/pcd_io.h>
#include <signal.h>

using namespace rtabmap;

void showUsage()
{
	printf("\nUsage:\n"
			"   rtabmap-reprocess [options] \"input.db\" \"output.db\"\n"
			"   rtabmap-reprocess [options] \"input1.db;input2.db;input3.db\" \"output.db\"\n"
			"   For the second example, only parameters from the first database are used.\n"
			"   If Mem/IncrementalMemory is false, RTAB-Map is initialized with the first input database.\n"
			"   To see warnings when loop closures are rejected, add \"--uwarn\" argument.\n"
			"  Options:\n"
			"     -r                Use database stamps as input rate.\n"
			"     -c \"path.ini\"   Configuration file, overwriting parameters read \n"
			"                       from the database. If custom parameters are also set as \n"
			"                       arguments, they overwrite those in config file and the database.\n"
			"     -g2         Assemble 2D occupancy grid map and save it to \"[output]_map.pgm\".\n"
			"     -g3         Assemble 3D cloud map and save it to \"[output]_map.pcd\".\n"
			"     -o2         Assemble OctoMap 2D projection and save it to \"[output]_octomap.pgm\".\n"
			"     -o3         Assemble OctoMap 3D cloud and save it to \"[output]_octomap.pcd\".\n"
			"%s\n"
			"\n", Parameters::showUsage());
	exit(1);
}

// catch ctrl-c
bool g_loopForever = true;
void sighandler(int sig)
{
	printf("\nSignal %d caught...\n", sig);
	g_loopForever = false;
}

int loopCount = 0;
int totalFrames = 0;
std::vector<float> previousLocalizationDistances;
std::vector<float> odomDistances;
std::vector<float> localizationDistances;
std::vector<float> localizationTime;
void showLocalizationStats()
{
	printf("Total localizations on previous session = %d/%d\n", loopCount, totalFrames);
	loopCount = 0;
	totalFrames = 0;
	{
		float m = uMean(localizationTime);
		float var = uVariance(localizationTime, m);
		float stddev = -1;
		if(var>0)
		{
			stddev = sqrt(var);
		}
		printf("Average localization time = %f ms (stddev=%f ms)\n", m, stddev);
	}
	if(!localizationDistances.empty())
	{
		float m = uMean(localizationDistances);
		float var = uVariance(localizationDistances, m);
		float stddev = -1;
		if(var>0)
		{
			stddev = sqrt(var);
		}
		printf("Average localization distance = %f m (stddev=%f m)\n", m, stddev);
	}
	if(!previousLocalizationDistances.empty())
	{
		float m = uMean(previousLocalizationDistances);
		float var = uVariance(previousLocalizationDistances, m);
		float stddev = -1;
		if(var>0)
		{
			stddev = sqrt(var);
		}
		printf("Average distance from previous localization = %f m (stddev=%f m)\n", m, stddev);
	}
	if(!odomDistances.empty())
	{
		float m = uMean(odomDistances);
		float var = uVariance(odomDistances, m);
		float stddev = -1;
		if(var>0)
		{
			stddev = sqrt(var);
		}
		printf("Average odometry distances = %f m (stddev=%f m)\n", m, stddev);
	}
}

int main(int argc, char * argv[])
{
	signal(SIGABRT, &sighandler);
	signal(SIGTERM, &sighandler);
	signal(SIGINT, &sighandler);

	ULogger::setType(ULogger::kTypeConsole);
	ULogger::setLevel(ULogger::kError);

	ParametersMap customParameters = Parameters::parseArguments(argc, argv);

	if(argc < 3)
	{
		showUsage();
	}

	bool assemble2dMap = false;
	bool assemble3dMap = false;
	bool assemble2dOctoMap = false;
	bool assemble3dOctoMap = false;
	bool useDatabaseRate = false;
	ParametersMap configParameters;
	for(int i=1; i<argc-2; ++i)
	{
		if(strcmp(argv[i], "-r") == 0 || strcmp(argv[i], "--r") == 0)
		{
			useDatabaseRate = true;
			printf("Using database stamps as input rate.\n");
		}
		else if (strcmp(argv[i], "-c") == 0 || strcmp(argv[i], "--c") == 0)
		{
			++i;
			if (i < argc - 2 && UFile::exists(argv[i]) && UFile::getExtension(argv[i]).compare("ini") == 0)
			{
				Parameters::readINI(argv[i], configParameters);
				printf("Using %d parameters from config file \"%s\"\n", (int)configParameters.size(), argv[i]);
			}
			else if(i < argc - 2)
			{
				printf("Config file \"%s\" is not valid or doesn't exist!\n", argv[i]);
			}
			else
			{
				printf("Config file is not set!\n");
			}
		}
		else if(strcmp(argv[i], "-g2") == 0 || strcmp(argv[i], "--g2") == 0)
		{
			assemble2dMap = true;
			printf("2D occupancy grid will be assembled (-g2 option).\n");
		}
		else if(strcmp(argv[i], "-g3") == 0 || strcmp(argv[i], "--g3") == 0)
		{
			assemble3dMap = true;
			printf("3D cloud map will be assembled (-g3 option).\n");
		}
		else if(strcmp(argv[i], "-o2") == 0 || strcmp(argv[i], "--o2") == 0)
		{
#ifdef RTABMAP_OCTOMAP
			assemble2dOctoMap = true;
			printf("OctoMap will be assembled (-o2 option).\n");
#else
			printf("RTAB-Map is not built with OctoMap support, cannot set -o2 option!\n");
#endif
		}
		else if(strcmp(argv[i], "-o3") == 0 || strcmp(argv[i], "--o3") == 0)
		{
#ifdef RTABMAP_OCTOMAP
			assemble3dOctoMap = true;
			printf("OctoMap will be assembled (-o3 option).\n");
#else
			printf("RTAB-Map is not built with OctoMap support, cannot set -o3 option!\n");
#endif
		}
	}

	std::string inputDatabasePath = uReplaceChar(argv[argc-2], '~', UDirectory::homeDir());
	std::string outputDatabasePath = uReplaceChar(argv[argc-1], '~', UDirectory::homeDir());

	std::list<std::string> databases = uSplit(inputDatabasePath, ';');
	if (databases.empty())
	{
		printf("No input database \"%s\" detected!\n", inputDatabasePath.c_str());
		return -1;
	}
	for (std::list<std::string>::iterator iter = databases.begin(); iter != databases.end(); ++iter)
	{
		if (!UFile::exists(*iter))
		{
			printf("Input database \"%s\" doesn't exist!\n", iter->c_str());
			return -1;
		}

		if (UFile::getExtension(*iter).compare("db") != 0)
		{
			printf("File \"%s\" is not a database format (*.db)!\n", iter->c_str());
			return -1;
		}
	}

	if(UFile::getExtension(outputDatabasePath).compare("db") != 0)
	{
		printf("File \"%s\" is not a database format (*.db)!\n", outputDatabasePath.c_str());
		return -1;
	}

	if(UFile::exists(outputDatabasePath))
	{
		UFile::erase(outputDatabasePath);
	}

	// Get parameters of the first database
	DBDriver * dbDriver = DBDriver::create();
	if(!dbDriver->openConnection(databases.front(), false))
	{
		printf("Failed opening input database!\n");
		delete dbDriver;
		return -1;
	}

	ParametersMap parameters = dbDriver->getLastParameters();
	if(parameters.empty())
	{
		printf("WARNING: Failed getting parameters from database, reprocessing will be done with default parameters! Database version may be too old (%s).\n", dbDriver->getDatabaseVersion().c_str());
	}
	if(customParameters.size())
	{
		printf("Custom parameters:\n");
		for(ParametersMap::iterator iter=customParameters.begin(); iter!=customParameters.end(); ++iter)
		{
			printf("  %s\t= %s\n", iter->first.c_str(), iter->second.c_str());
		}
	}
	uInsert(parameters, configParameters);
	uInsert(parameters, customParameters);

	bool incrementalMemory = Parameters::defaultMemIncrementalMemory();
	Parameters::parse(parameters, Parameters::kMemIncrementalMemory(), incrementalMemory);

	int totalIds = 0;
	std::set<int> ids;
	dbDriver->getAllNodeIds(ids);
	if(ids.empty())
	{
		printf("Input database doesn't have any nodes saved in it.\n");
		dbDriver->closeConnection(false);
		delete dbDriver;
		return -1;
	}
	if(!(!incrementalMemory && databases.size() > 1))
	{
		totalIds = ids.size();
	}
	dbDriver->closeConnection(false);

	// Count remaining ids in the other databases
	for (std::list<std::string>::iterator iter = ++databases.begin(); iter != databases.end(); ++iter)
	{
		if (!dbDriver->openConnection(*iter, false))
		{
			printf("Failed opening input database!\n");
			delete dbDriver;
			return -1;
		}
		ids.clear();
		dbDriver->getAllNodeIds(ids);
		totalIds += ids.size();
		dbDriver->closeConnection(false);
	}
	delete dbDriver;
	dbDriver = 0;

	std::string workingDirectory = UDirectory::getDir(outputDatabasePath);
	printf("Set working directory to \"%s\".\n", workingDirectory.c_str());
	uInsert(parameters, ParametersPair(Parameters::kRtabmapWorkingDirectory(), workingDirectory));
	uInsert(parameters, ParametersPair(Parameters::kRtabmapPublishStats(), "true")); // to log status below

	if(!incrementalMemory && databases.size() > 1)
	{
		UFile::copy(databases.front(), outputDatabasePath);
		printf("Parameter \"%s\" is set to false, initializing RTAB-Map with \"%s\" for localization...\n", Parameters::kMemIncrementalMemory().c_str(), databases.front().c_str());
		databases.pop_front();
		inputDatabasePath = uJoin(databases, ";");
	}

	Rtabmap rtabmap;
	rtabmap.init(parameters, outputDatabasePath);

	bool rgbdEnabled = Parameters::defaultRGBDEnabled();
	Parameters::parse(parameters, Parameters::kRGBDEnabled(), rgbdEnabled);
	bool odometryIgnored = !rgbdEnabled;
	DBReader dbReader(inputDatabasePath, useDatabaseRate?-1:0, odometryIgnored);
	dbReader.init();

	OccupancyGrid grid(parameters);
	grid.setCloudAssembling(assemble3dMap);
#ifdef RTABMAP_OCTOMAP
	OctoMap octomap(parameters);
#endif

	printf("Reprocessing data of \"%s\"...\n", inputDatabasePath.c_str());
	std::map<std::string, float> globalMapStats;
	int processed = 0;
	CameraInfo info;
	SensorData data = dbReader.takeImage(&info);
	Transform lastLocalizationPose = info.odomPose;
	while(data.isValid() && g_loopForever)
	{
		UTimer iterationTime;
		std::string status;
		if(!odometryIgnored && info.odomPose.isNull())
		{
			printf("Skipping node %d as it doesn't have odometry pose set.\n", data.id());
		}
		else
		{
			if(!odometryIgnored && !info.odomCovariance.empty() && info.odomCovariance.at<double>(0,0)>=9999)
			{
				printf("High variance detected, triggering a new map...\n");
				if(!incrementalMemory && processed>0)
				{
					showLocalizationStats();
					lastLocalizationPose = info.odomPose;
				}
				if(incrementalMemory)
				{
					rtabmap.triggerNewMap();
				}
			}
			UTimer t;
			if(!rtabmap.process(data, info.odomPose, info.odomCovariance, info.odomVelocity, globalMapStats))
			{
				printf("Failed processing node %d.\n", data.id());
				globalMapStats.clear();
			}
			else if(assemble2dMap || assemble3dMap || assemble2dOctoMap || assemble3dOctoMap)
			{
				globalMapStats.clear();
				double timeRtabmap = t.ticks();
				double timeUpdateInit = 0.0;
				double timeUpdateGrid = 0.0;
#ifdef RTABMAP_OCTOMAP
				double timeUpdateOctoMap = 0.0;
#endif
				const rtabmap::Statistics & stats = rtabmap.getStatistics();
				if(stats.poses().size() && stats.getLastSignatureData().id())
				{
					int id = stats.poses().rbegin()->first;
					if(id == stats.getLastSignatureData().id() &&
					   stats.getLastSignatureData().sensorData().gridCellSize() > 0.0f)
					{
						bool updateGridMap = false;
						bool updateOctoMap = false;
						if((assemble2dMap || assemble3dMap) && grid.addedNodes().find(id) == grid.addedNodes().end())
						{
							updateGridMap = true;
						}
#ifdef RTABMAP_OCTOMAP
						if((assemble2dOctoMap || assemble3dOctoMap) && octomap.addedNodes().find(id) == octomap.addedNodes().end())
						{
							updateOctoMap = true;
						}
#endif
						if(updateGridMap || updateOctoMap)
						{
							cv::Mat ground, obstacles, empty;
							stats.getLastSignatureData().sensorData().uncompressDataConst(0, 0, 0, 0, &ground, &obstacles, &empty);

							timeUpdateInit = t.ticks();

							if(updateGridMap)
							{
								grid.addToCache(id, ground, obstacles, empty);
								grid.update(stats.poses());
								timeUpdateGrid = t.ticks() + timeUpdateInit;
							}
#ifdef RTABMAP_OCTOMAP
							if(updateOctoMap)
							{
								const cv::Point3f & viewpoint = stats.getLastSignatureData().sensorData().gridViewPoint();
								octomap.addToCache(id, ground, obstacles, empty, viewpoint);
								octomap.update(stats.poses());
								timeUpdateOctoMap = t.ticks() + timeUpdateInit;
							}
#endif
						}
					}
				}

				globalMapStats.insert(std::make_pair(std::string("GlobalGrid/GridUpdate/ms"), timeUpdateGrid*1000.0f));
#ifdef RTABMAP_OCTOMAP
				//Simulate publishing
				double timePub2dOctoMap = 0.0;
				double timePub3dOctoMap = 0.0;
				if(assemble2dOctoMap)
				{
					float xMin, yMin, size;
					octomap.createProjectionMap(xMin, yMin, size);
					timePub2dOctoMap = t.ticks();
				}
				if(assemble3dOctoMap)
				{
					octomap.createCloud();
					timePub3dOctoMap = t.ticks();
				}

				globalMapStats.insert(std::make_pair(std::string("GlobalGrid/OctoMapUpdate/ms"), timeUpdateOctoMap*1000.0f));
				globalMapStats.insert(std::make_pair(std::string("GlobalGrid/OctoMapProjection/ms"), timePub2dOctoMap*1000.0f));
				globalMapStats.insert(std::make_pair(std::string("GlobalGrid/OctomapToCloud/ms"), timePub3dOctoMap*1000.0f));
				globalMapStats.insert(std::make_pair(std::string("GlobalGrid/TotalWithRtabmap/ms"), (timeUpdateGrid+timeUpdateOctoMap+timePub2dOctoMap+timePub3dOctoMap+timeRtabmap)*1000.0f));
#else
				globalMapStats.insert(std::make_pair(std::string("GlobalGrid/TotalWithRtabmap/ms"), (timeUpdateGrid+timeRtabmap)*1000.0f));
#endif
			}
		}

		const rtabmap::Statistics & stats = rtabmap.getStatistics();
		int loopId = stats.loopClosureId() > 0? stats.loopClosureId(): stats.proximityDetectionId() > 0?stats.proximityDetectionId() :0;
		int landmarkId = (int)uValue(stats.data(), rtabmap::Statistics::kLoopLandmark_detected(), 0.0f);
		int refMapId = stats.refImageMapId();
		++totalFrames;
		if (loopId>0)
		{
			++loopCount;
			int loopMapId = stats.loopClosureId() > 0? stats.loopClosureMapId(): stats.proximityDetectionMapId();
			printf("Processed %d/%d nodes [%d]... %dms Loop on %d [%d]\n", ++processed, totalIds, refMapId, int(iterationTime.ticks() * 1000), loopId, loopMapId);
		}
		else if(landmarkId != 0)
		{
			printf("Processed %d/%d nodes [%d]... %dms Loop on landmark %d\n", ++processed, totalIds, refMapId, int(iterationTime.ticks() * 1000), landmarkId);
		}
		else
		{
			printf("Processed %d/%d nodes [%d]... %dms\n", ++processed, totalIds, refMapId, int(iterationTime.ticks() * 1000));
		}

		// Here we accumulate statistics about distance from last localization
		if(!incrementalMemory &&
		   !lastLocalizationPose.isNull() &&
		   !info.odomPose.isNull())
		{
			if(loopId>0 || landmarkId != 0)
			{
				previousLocalizationDistances.push_back(lastLocalizationPose.getDistance(info.odomPose));
				lastLocalizationPose = info.odomPose;
			}
		}
		if(!incrementalMemory)
		{
			float totalTime = uValue(stats.data(), rtabmap::Statistics::kTimingTotal(), 0.0f);
			localizationTime.push_back(totalTime);
			if(loopId>0)
			{
				localizationDistances.push_back(stats.loopClosureTransform().getNorm());
			}
		}

		Transform odomPose = info.odomPose;
		data = dbReader.takeImage(&info);

		if(!incrementalMemory &&
		   !odomPose.isNull() &&
		   !info.odomPose.isNull())
		{
			odomDistances.push_back(odomPose.getDistance(info.odomPose));
		}
	}

	if(!incrementalMemory)
	{
		showLocalizationStats();
	}
	else
	{
		printf("Total loop closures = %d\n", loopCount);
	}

	printf("Closing database \"%s\"...\n", outputDatabasePath.c_str());
	rtabmap.close(true);
	printf("Closing database \"%s\"... done!\n", outputDatabasePath.c_str());

	if(assemble2dMap)
	{
		std::string outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_map.pgm";
		float xMin,yMin;
		cv::Mat map = grid.getMap(xMin, yMin);
		if(!map.empty())
		{
			cv::Mat map8U(map.rows, map.cols, CV_8U);
			//convert to gray scaled map
			for (int i = 0; i < map.rows; ++i)
			{
				for (int j = 0; j < map.cols; ++j)
				{
					char v = map.at<char>(i, j);
					unsigned char gray;
					if(v == 0)
					{
						gray = 178;
					}
					else if(v == 100)
					{
						gray = 0;
					}
					else // -1
					{
						gray = 89;
					}
					map8U.at<unsigned char>(i, j) = gray;
				}
			}
			if(cv::imwrite(outputPath, map8U))
			{
				printf("Saving occupancy grid \"%s\"... done!\n", outputPath.c_str());
			}
			else
			{
				printf("Saving occupancy grid \"%s\"... failed!\n", outputPath.c_str());
			}
		}
		else
		{
			printf("2D map is empty! Cannot save it!\n");
		}
	}
	if(assemble3dMap)
	{
		std::string outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_obstacles.pcd";
		if(pcl::io::savePCDFileBinary(outputPath, *grid.getMapObstacles()) == 0)
		{
			printf("Saving 3d obstacles \"%s\"... done!\n", outputPath.c_str());
		}
		else
		{
			printf("Saving 3d obstacles \"%s\"... failed!\n", outputPath.c_str());
		}
		if(grid.getMapGround()->size())
		{
			outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_ground.pcd";
			if(pcl::io::savePCDFileBinary(outputPath, *grid.getMapGround()) == 0)
			{
				printf("Saving 3d ground \"%s\"... done!\n", outputPath.c_str());
			}
			else
			{
				printf("Saving 3d ground \"%s\"... failed!\n", outputPath.c_str());
			}
		}
		if(grid.getMapEmptyCells()->size())
		{
			outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_empty.pcd";
			if(pcl::io::savePCDFileBinary(outputPath, *grid.getMapEmptyCells()) == 0)
			{
				printf("Saving 3d empty cells \"%s\"... done!\n", outputPath.c_str());
			}
			else
			{
				printf("Saving 3d empty cells \"%s\"... failed!\n", outputPath.c_str());
			}
		}
	}
#ifdef RTABMAP_OCTOMAP
	if(assemble2dOctoMap)
	{
		std::string outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_octomap.pgm";
		float xMin,yMin,cellSize;
		cv::Mat map = octomap.createProjectionMap(xMin, yMin, cellSize);
		if(!map.empty())
		{
			cv::Mat map8U(map.rows, map.cols, CV_8U);
			//convert to gray scaled map
			for (int i = 0; i < map.rows; ++i)
			{
				for (int j = 0; j < map.cols; ++j)
				{
					char v = map.at<char>(i, j);
					unsigned char gray;
					if(v == 0)
					{
						gray = 178;
					}
					else if(v == 100)
					{
						gray = 0;
					}
					else // -1
					{
						gray = 89;
					}
					map8U.at<unsigned char>(i, j) = gray;
				}
			}
			if(cv::imwrite(outputPath, map8U))
			{
				printf("Saving octomap 2D projection \"%s\"... done!\n", outputPath.c_str());
			}
			else
			{
				printf("Saving octomap 2D projection \"%s\"... failed!\n", outputPath.c_str());
			}
		}
		else
		{
			printf("OctoMap 2D projection map is empty! Cannot save it!\n");
		}
	}
	if(assemble3dOctoMap)
	{
		std::string outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_octomap_occupied.pcd";
		std::vector<int> obstacles, emptySpace, ground;
		pcl::PointCloud<pcl::PointXYZRGB>::Ptr cloud = octomap.createCloud(0, &obstacles, &emptySpace, &ground);
		if(pcl::io::savePCDFile(outputPath, *cloud, obstacles, true) == 0)
		{
			printf("Saving obstacles cloud \"%s\"... done!\n", outputPath.c_str());
		}
		else
		{
			printf("Saving obstacles cloud \"%s\"... failed!\n", outputPath.c_str());
		}
		if(ground.size())
		{
			outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_octomap_ground.pcd";
			if(pcl::io::savePCDFile(outputPath, *cloud, ground, true) == 0)
			{
				printf("Saving empty space cloud \"%s\"... done!\n", outputPath.c_str());
			}
			else
			{
				printf("Saving empty space cloud \"%s\"... failed!\n", outputPath.c_str());
			}
		}
		if(emptySpace.size())
		{
			outputPath = outputDatabasePath.substr(0, outputDatabasePath.size()-3) + "_octomap_empty.pcd";
			if(pcl::io::savePCDFile(outputPath, *cloud, emptySpace, true) == 0)
			{
				printf("Saving empty space cloud \"%s\"... done!\n", outputPath.c_str());
			}
			else
			{
				printf("Saving empty space cloud \"%s\"... failed!\n", outputPath.c_str());
			}
		}
	}
#endif

	return 0;
}