How to dump FLAME paramters from fitting results?

[199ChenNuo]

I get a *.ply output from fit_3D_mesh.py, and I want to get FLAME parameters directly from the output or during fitting.
I output the tf_pose and tf_exp in the function fit_3D_mesh(), from the source code I know that

tf_pose = [neck_pose, jaw_pose, eyeballs_pose]

And is the tf_exp the FLAME expression parameters?

I also wonder if there is a direct way to generate FLAME model from parameters so that I can test whether I got the right FLAME parameters. I noticed that there is an online viewer provided on the FLAME website, but I didn't find the relevant code in the Mesh project.

[TimoBolkart]

Yes, tf_exp are the expression parameters. The Mesh package has a MeshViewer to visualize meshes, otherwise one can output the FLAME mesh and check it in MeshLab