PySurfer Installation - Blank GUI screen with only colorbar display

[Leema-Krishna-Murali]

Hello Team,

I tried to install PySurfer and followed the steps given on the GitHub page. After installation, I just ran the demo code for displaying the aparac.2009 parcellations. I just get a blank screen with a colorbar. The parcellations for gyri and sulci are not displayed. I tried to run the code in the Jupyter notebook and also in the python terminal, but I get the same issue. I have set the environment variable SUBJECTS_DIR as well.

Please find the below code and attached screenshot of the output:

import os
import numpy as np
import nibabel as nib
from surfer import Brain

print(doc)

subject_id = "fsaverage"
hemi = "lh"
surf = "inflated"
os.environ["SUBJECTS_DIR"] = "/home/ubuntu/freesurfer/subjects"

"""
Bring up the visualization.
"""
brain = Brain(subject_id, hemi, surf, background="white")

"""
Read in the automatic parcellation of sulci and gyri.
"""
aparc_file = os.path.join(os.environ["SUBJECTS_DIR"],
subject_id, "label",
hemi + ".aparc.a2009s.annot")
labels, ctab, names = nib.freesurfer.read_annot(aparc_file)

"""
Make a random vector of scalar data corresponding to a value for each region in
the parcellation.

"""
rs = np.random.RandomState(4)
roi_data = rs.uniform(.5, .8, size=len(names))

"""
Make a vector containing the data point at each vertex.
"""
vtx_data = roi_data[labels]

"""
Handle vertices that are not defined in the annotation.
"""
vtx_data[labels == -1] = -1

"""
Display these values on the brain. Use a sequential colormap (assuming
these data move from low to high values), and add an alpha channel so the
underlying anatomy is visible.
"""
brain.add_data(vtx_data, .5, .75, thresh=0, colormap="rocket", alpha=.8)

Can someone direct me on resolving this issue?

Thank you,
Leema