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Crash fix when "extrapolating". (#453) 

It can happen that ros::Time::now() is slightly behind the latest pose
timestamp if sensor data had newer timestamps. We would crash before.
Instead, we now publish the latest pose which is even newer that what
we tried to publish before.
master
Wolfgang Hess 2017-07-27 14:52:41 +02:00 committed by GitHub
parent 907586a7fc
commit 4bad3c4702
1 changed files with 7 additions and 4 deletions
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11
cartographer_ros/cartographer_ros/node.cc
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@ -136,10 +136,13 @@ void Node::PublishTrajectoryStates(const ::ros::WallTimerEvent& timer_event) {
geometry_msgs::TransformStamped stamped_transform;
// If we do not publish a new point cloud, we still allow time of the
// published poses to advance.
stamped_transform.header.stamp = ros::Time::now();
const Rigid3d tracking_to_local =
extrapolator.ExtrapolatePose(FromRos(stamped_transform.header.stamp));
// published poses to advance. If we already know a newer pose, we use its
// time instead. Since tf knows how to interpolate, providing newer
// information is better.
const ::cartographer::common::Time now =
std::max(FromRos(ros::Time::now()), extrapolator.GetLastPoseTime());
stamped_transform.header.stamp = ToRos(now);
const Rigid3d tracking_to_local = extrapolator.ExtrapolatePose(now);
const Rigid3d tracking_to_map =
trajectory_state.local_to_map * tracking_to_local;