PCT Planner

Overview

This is an implementation of paper Efficient Global Navigational Planning in 3D Structures based on Point Cloud Tomography (submitted to TMECH). It provides a highly efficient and extensible global navigation framework based on a tomographic understanding of the environment to navigate ground robots in multi-layer structures.

Demonstrations: pct_planner

Prerequisites

Environment

• Ubuntu >= 20.04
• ROS >= Noetic with ros-desktop-full installation
• CUDA >= 11.7

Python

• Python >= 3.8
• CuPy with CUDA >= 11.7
• Open3d

Build & Install

Inside the package, there are two modules: the point cloud tomography module for tomogram reconstruction (in tomography/) and the planner module for path planning and optimization (in planner/). You only need to build the planner module before use. In planner/, run build_thirdparty.sh first and then run build.sh.

cd planner/
./build_thirdparty.sh
./build.sh

Run Examples

Three example scenarios are provided: "Spiral", "Building", and "Plaza".

• "Spiral": A spiral overpass scenario released in the 3D2M planner.
• "Building": A multi-layer indoor scenario with various stairs, slopes, overhangs and obstacles.
• "Plaza": A complex outdoor plaza for repeated trajectory generation evaluation.

Tomogram Construction

To plan in a scenario, first you need to construct the scene tomogram using the pcd file.

• Unzip the pcd files in rsc/pcd/pcd_files.zip to rsc/pcd/.
• For scene "Spiral", you can download the pcd file from 3D2M planner spiral0.3_2.pcd.
• Run roscore, start RViz with the provided config (rsc/rviz/pct_ros.rviz).
• In tomography/scripts/, run tomography.py with the --scene argument:

cd tomography/scripts/
python3 tomography.py --scene Spiral

• The generated tomogram is visualized as ROS PointCloud2 message in RViz and saved in rsc/tomogram/.

Trajectory Generation

After the tomogram is constructed, you can run the trajectory generation example.

• In planner/scripts/, run plan.py with the --scene argument:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/YOUR/DIRECTORY/TO/PCT_planner/planner/lib/3rdparty/gtsam-4.1.1/install/lib
cd planner/scripts/
python3 plan.py --scene Spiral

• The generated trajectory is visualized as ROS Path message in RViz.

License

The source code is released under GPLv2 license.

For commercial use, please contact Bowen Yang byangar@connect.ust.hk.