Error with the DISPLAY environment variable about range-mcl

[Chen-Xieyuanli]

Hey @GinWeng, thanks for using our code.

It seems that you are using a remote or virtual machine which leads to an OpenGL issue.

So far, we have no solution for running in the remote or virtual environment.

I will just put your original log here, which explicitly indicates the error, and see whether others have any solutions.

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ubuntu@windowsOfJin:/mnt/f/Capstone/algorithms/range_mcl/src$ python3 main_range_mcl.py
INFO - 2021-12-16 14:47:17,664 - acceleratesupport - OpenGL_accelerate module loaded
INFO - 2021-12-16 14:47:17,667 - arraydatatype - Using accelerated ArrayDatatype
Load mesh map and initialize map module...
/home/ubuntu/.local/lib/python3.8/site-packages/glfw/init.py:834: GLFWError: (65544) b'X11: The DISPLAY environment variable is missing'
warnings.warn(message, GLFWError)
Traceback (most recent call last):
File "main_range_mcl.py", line 54, in
map_module = MapModule(map_poses, map_file)
File "/mnt/f/Capstone/algorithms/range_mcl/src/map_module.py", line 32, in init
window = OffscreenWindow(show=False)
File "/mnt/f/Capstone/algorithms/range_mcl/src/map_renderer/offscreen_window.py", line 13, in init
if not glfw.init(): raise RuntimeError("Unable to initialize glfw.")
RuntimeError: Unable to initialize glfw.