I have the rendered image. How can I convert it to a 3D mesh?

[HOMGH]

Hi @reshow
I had a question regarding generating a 3D mesh. For this, we need vertices (N3), textures(N3) and triangle indices. But in a case that the output of our model is just a shape (N3) and texture (224224*3) like https://github.com/tranluan/Nonlinear_Face_3DMM , how can we convert it to a 3D mesh? What triangle would be in this case?
Appreciate your help.

[reshow]

Has this problem been solved? I think Nonlinear 3DMM may provide a mapping between N3 and 2242243.