I created custom split normals, they show up in the viewport, but how can I get a list of them in python?
import bpy
mesh = bpy.context.object.data
mesh.use_auto_smooth = True
mesh.normals_split_custom_set( [(1, 1, 0) for v in mesh.loops] )
for l in mesh.loops:
print(l.normal)
The code above just prints out (0.0,0.0,0.0) vectors, so split normals are probably stored somewhere else.