Getting Normal Map from the 3D Shape or Depth Map

[TouqeerAhmad]

Hello, I have been trying to get the normal map from 3d shape/depth. Probing more into the code, I do see in render.py

3DDFA_V2/utils/render.py

Line 38 in 1b6c676

overlap = render_app(ver, tri, overlap)

the lighting pipeline is used which then renders the texture or light. And inside the lighting.py surface normals are generated.

3DDFA_V2/Sim3DR/lighting.py

Line 38 in 1b6c676

normal = get_normal(vertices, triangles)

However, when I pass these normals instead of the light or texture in the rasterize function, I do not see the proper looking normals instead I see something like this:

Please advise if I can use the same rasterization for generated surface normals, or something different should be done to get the normal map from the 3D shape.
Thanks,
Touqeer