在octomap中制定起止点，目标点，使用rrt规划一条路径出来，没有运动学，动力学的限制，只要能避开障碍物。
效果如下(绿线是规划的路线，红线是B样条优化的曲线)：
#include "ros/ros.h"
#include <octomap_msgs/Octomap.h>
#include <octomap_msgs/conversions.h>
#include <octomap_ros/conversions.h>
#include <octomap/octomap.h>
#include <message_filters/subscriber.h>
#include "visualization_msgs/Marker.h"
#include <trajectory_msgs/MultiDOFJointTrajectory.h>
#include <nav_msgs/Odometry.h>
#include <geometry_msgs/Pose.h>
#include <nav_msgs/Path.h>
#include <geometry_msgs/PoseStamped.h>
#include <ompl/base/spaces/SE3StateSpace.h>
#include <ompl/base/spaces/SE3StateSpace.h>
#include <ompl/base/OptimizationObjective.h>
#include <ompl/base/objectives/PathLengthOptimizationObjective.h>
// #include <ompl/geometric/planners/rrt/RRTstar.h>
#include <ompl/geometric/planners/rrt/InformedRRTstar.h>
#include <ompl/geometric/SimpleSetup.h>
#include <ompl/config.h>
#include <iostream>
#include "fcl/config.h"
#include "fcl/octree.h"
#include "fcl/traversal/traversal_node_octree.h"
#include "fcl/collision.h"
#include "fcl/broadphase/broadphase.h"
#include "fcl/math/transform.h"
namespace ob = ompl::base;
namespace og = ompl::geometric;
// Declear some global variables
//ROS publishers
ros::Publisher vis_pub;
ros::Publisher traj_pub;
class planner {
public:
void setStart(double x, double y, double z)
{
ob::ScopedState<ob::SE3StateSpace> start(space);
start->setXYZ(x,y,z);
start->as<ob::SO3StateSpace::StateType>(1)->setIdentity();
pdef->clearStartStates();
pdef->addStartState(start);
}
void setGoal(double x, double y, double z)
{
ob::ScopedState<ob::SE3StateSpace> goal(space);
goal->setXYZ(x,y,z);
goal->as<ob::SO3StateSpace::StateType>(1)->setIdentity();
pdef->clearGoal();
pdef->setGoalState(goal);
std::cout << "goal set to: " << x << " " << y << " " << z << std::endl;
}
void updateMap(std::shared_ptr<fcl::CollisionGeometry> map)
{
tree_obj = map;
}
// Constructor
planner(void)
{
//四旋翼的障碍物几何形状
Quadcopter = std::shared_ptr<fcl::CollisionGeometry>(new fcl::Box(0.8, 0.8, 0.3));
//分辨率参数设置
fcl::OcTree* tree = new fcl::OcTree(std::shared_ptr<const octomap::OcTree>(new octomap::OcTree(0.15)));
tree_obj = std::shared_ptr<fcl::CollisionGeometry>(tree);
//解的状态空间
space = ob::StateSpacePtr(new ob::SE3StateSpace());
// create a start state
ob::ScopedState<ob::SE3StateSpace> start(space);
// create a goal state
ob::ScopedState<ob::SE3StateSpace> goal(space);
// set the bounds for the R^3 part of SE(3)
// 搜索的三维范围设置
ob::RealVectorBounds bounds(3);
bounds.setLow(0,-5);
bounds.setHigh(0,5);
bounds.setLow(1,-5);
bounds.setHigh(1,5);
bounds.setLow(2,0);
bounds.setHigh(2,3);
space->as<ob::SE3StateSpace>()->setBounds(bounds);
// construct an instance of space information from this state space
si = ob::SpaceInformationPtr(new ob::SpaceInformation(space));
start->setXYZ(0,0,0);
start->as<ob::SO3StateSpace::StateType>(1)->setIdentity();
// start.random();
goal->setXYZ(0,0,0);
goal->as<ob::SO3StateSpace::StateType>(1)->setIdentity();
// goal.random();
// set state validity checking for this space
si->setStateValidityChecker(std::bind(&planner::isStateValid, this, std::placeholders::_1 ));
// create a problem instance
pdef = ob::ProblemDefinitionPtr(new ob::ProblemDefinition(si));
// set the start and goal states
pdef->setStartAndGoalStates(start, goal);
// set Optimizattion objective
pdef->setOptimizationObjective(planner::getPathLengthObjWithCostToGo(si));
std::cout << "Initialized: " << std::endl;
}
// Destructor
~planner()
{
}
void replan(void)
{
std::cout << "Total Points:" << path_smooth->getStateCount () << std::endl;
if(path_smooth->getStateCount () <= 2)
plan();
else
{
for (std::size_t idx = 0; idx < path_smooth->getStateCount (); idx++)
{
if(!replan_flag)
replan_flag = !isStateValid(path_smooth->getState(idx));
else
break;
}
if(replan_flag)
plan();
else
std::cout << "Replanning not required" << std::endl;
}
}
void plan(void)
{
// create a planner for the defined space
og::InformedRRTstar* rrt = new og::InformedRRTstar(si);
//设置rrt的参数range
rrt->setRange(0.2);
ob::PlannerPtr plan(rrt);
// set the problem we are trying to solve for the planner
plan->setProblemDefinition(pdef);
// perform setup steps for the planner
plan->setup();
// print the settings for this space
si->printSettings(std::cout);
std::cout << "problem setting\n";
// print the problem settings
pdef->print(std::cout);
// attempt to solve the problem within one second of planning time
ob::PlannerStatus solved = plan->solve(1);
if (solved)
{
// get the goal representation from the problem definition (not the same as the goal state)
// and inquire about the found path
std::cout << "Found solution:" << std::endl;
ob::PathPtr path = pdef->getSolutionPath();
og::PathGeometric* pth = pdef->getSolutionPath()->as<og::PathGeometric>();
pth->printAsMatrix(std::cout);
// print the path to screen
// path->print(std::cout);
nav_msgs::Path msg;
msg.header.stamp = ros::Time::now();
msg.header.frame_id = "map";
for (std::size_t path_idx = 0; path_idx < pth->getStateCount (); path_idx++)
{
const ob::SE3StateSpace::StateType *se3state = pth->getState(path_idx)->as<ob::SE3StateSpace::StateType>();
// extract the first component of the state and cast it to what we expect
const ob::RealVectorStateSpace::StateType *pos = se3state->as<ob::RealVectorStateSpace::StateType>(0);
// extract the second component of the state and cast it to what we expect
const ob::SO3StateSpace::StateType *rot = se3state->as<ob::SO3StateSpace::StateType>(1);
geometry_msgs::PoseStamped pose;
// pose.header.frame_id = "/world"
pose.pose.position.x = pos->values[0];
pose.pose.position.y = pos->values[1];
pose.pose.position.z = pos->values[2];
pose.pose.orientation.x = rot->x;
pose.pose.orientation.y = rot->y;
pose.pose.orientation.z = rot->z;
pose.pose.orientation.w = rot->w;
msg.poses.push_back(pose);
}
traj_pub.publish(msg);
//Path smoothing using bspline
//B样条曲线优化
og::PathSimplifier* pathBSpline = new og::PathSimplifier(si);
path_smooth = new og::PathGeometric(dynamic_cast<const og::PathGeometric&>(*pdef->getSolutionPath()));
pathBSpline->smoothBSpline(*path_smooth,3);
// std::cout << "Smoothed Path" << std::endl;
// path_smooth.print(std::cout);
//Publish path as markers
nav_msgs::Path smooth_msg;
smooth_msg.header.stamp = ros::Time::now();
smooth_msg.header.frame_id = "map";
for (std::size_t idx = 0; idx < path_smooth->getStateCount (); idx++)
{
// cast the abstract state type to the type we expect
const ob::SE3StateSpace::StateType *se3state = path_smooth->getState(idx)->as<ob::SE3StateSpace::StateType>();
// extract the first component of the state and cast it to what we expect
const ob::RealVectorStateSpace::StateType *pos = se3state->as<ob::RealVectorStateSpace::StateType>(0);
// extract the second component of the state and cast it to what we expect
const ob::SO3StateSpace::StateType *rot = se3state->as<ob::SO3StateSpace::StateType>(1);
geometry_msgs::PoseStamped point;
// pose.header.frame_id = "/world"
point.pose.position.x = pos->values[0];
point.pose.position.y = pos->values[1];
point.pose.position.z = pos->values[2];
point.pose.orientation.x = rot->x;
point.pose.orientation.y = rot->y;
point.pose.orientation.z = rot->z;
point.pose.orientation.w = rot->w;
smooth_msg.poses.push_back(point);
std::cout << "Published marker: " << idx << std::endl;
}
vis_pub.publish(smooth_msg);
// ros::Duration(0.1).sleep();
// Clear memory
pdef->clearSolutionPaths();
replan_flag = false;
}
else
std::cout << "No solution found" << std::endl;
}
private:
// construct the state space we are planning in
ob::StateSpacePtr space;
// construct an instance of space information from this state space
ob::SpaceInformationPtr si;
// create a problem instance
ob::ProblemDefinitionPtr pdef;
og::PathGeometric* path_smooth;
bool replan_flag = false;
std::shared_ptr<fcl::CollisionGeometry> Quadcopter;
std::shared_ptr<fcl::CollisionGeometry> tree_obj;
bool isStateValid(const ob::State *state)
{
// cast the abstract state type to the type we expect
const ob::SE3StateSpace::StateType *se3state = state->as<ob::SE3StateSpace::StateType>();
// extract the first component of the state and cast it to what we expect
const ob::RealVectorStateSpace::StateType *pos = se3state->as<ob::RealVectorStateSpace::StateType>(0);
// extract the second component of the state and cast it to what we expect
const ob::SO3StateSpace::StateType *rot = se3state->as<ob::SO3StateSpace::StateType>(1);
fcl::CollisionObject treeObj((tree_obj));
fcl::CollisionObject aircraftObject(Quadcopter);
// check validity of state defined by pos & rot
fcl::Vec3f translation(pos->values[0],pos->values[1],pos->values[2]);
fcl::Quaternion3f rotation(rot->w, rot->x, rot->y, rot->z);
aircraftObject.setTransform(rotation, translation);
fcl::CollisionRequest requestType(1,false,1,false);
fcl::CollisionResult collisionResult;
fcl::collide(&aircraftObject, &treeObj, requestType, collisionResult);
return(!collisionResult.isCollision());
}
// Returns a structure representing the optimization objective to use
// for optimal motion planning. This method returns an objective which
// attempts to minimize the length in configuration space of computed
// paths.
ob::OptimizationObjectivePtr getThresholdPathLengthObj(const ob::SpaceInformationPtr& si)
{
ob::OptimizationObjectivePtr obj(new ob::PathLengthOptimizationObjective(si));
// obj->setCostThreshold(ob::Cost(1.51));
return obj;
}
ob::OptimizationObjectivePtr getPathLengthObjWithCostToGo(const ob::SpaceInformationPtr& si)
{
ob::OptimizationObjectivePtr obj(new ob::PathLengthOptimizationObjective(si));
obj->setCostToGoHeuristic(&ob::goalRegionCostToGo);
return obj;
}
};
void octomapCallback(const octomap_msgs::Octomap::ConstPtr &msg, planner* planner_ptr)
{
//loading octree from binary
// const std::string filename = "/home/xiaopeng/dense.bt";
// octomap::OcTree temp_tree(0.1);
// temp_tree.readBinary(filename);
// fcl::OcTree* tree = new fcl::OcTree(std::shared_ptr<const octomap::OcTree>(&temp_tree));
// convert octree to collision object
octomap::OcTree* tree_oct = dynamic_cast<octomap::OcTree*>(octomap_msgs::msgToMap(*msg));
fcl::OcTree* tree = new fcl::OcTree(std::shared_ptr<const octomap::OcTree>(tree_oct));
// Update the octree used for collision checking
planner_ptr->updateMap(std::shared_ptr<fcl::CollisionGeometry>(tree));
planner_ptr->replan();
}
void odomCb(const nav_msgs::Odometry::ConstPtr &msg, planner* planner_ptr)
{
planner_ptr->setStart(msg->pose.pose.position.x, msg->pose.pose.position.y, msg->pose.pose.position.z);
}
void startCb(const geometry_msgs::PointStamped::ConstPtr &msg, planner* planner_ptr)
{
planner_ptr->setStart(msg->point.x, msg->point.y, msg->point.z);
}
void goalCb(const geometry_msgs::PointStamped::ConstPtr &msg, planner* planner_ptr)
{
planner_ptr->setGoal(msg->point.x, msg->point.y, msg->point.z);
planner_ptr->plan();
}
int main(int argc, char **argv)
{
ros::init(argc, argv, "octomap_planner");
ros::NodeHandle n;
planner planner_object;
ros::Subscriber octree_sub = n.subscribe<octomap_msgs::Octomap>("/octomap_binary", 1, boost::bind(&octomapCallback, _1, &planner_object));
// ros::Subscriber odom_sub = n.subscribe<nav_msgs::Odometry>("/rovio/odometry", 1, boost::bind(&odomCb, _1, &planner_object));
ros::Subscriber goal_sub = n.subscribe<geometry_msgs::PointStamped>("/goal/clicked_point", 1, boost::bind(&goalCb, _1, &planner_object));
ros::Subscriber start_sub = n.subscribe<geometry_msgs::PointStamped>("/start/clicked_point", 1, boost::bind(&startCb, _1, &planner_object));
// vis_pub = n.advertise<visualization_msgs::Marker>( "visualization_marker", 0 );
vis_pub = n.advertise<nav_msgs::Path>( "visualization_marker", 0 );
// traj_pub = n.advertise<trajectory_msgs::MultiDOFJointTrajectory>("waypoints",1);
traj_pub = n.advertise<nav_msgs::Path>("waypoints",1);
std::cout << "OMPL version: " << OMPL_VERSION << std::endl;
ros::spin();
return 0;
}