read custom normals

[vicentecarro]

Hi,

How can I read the custom normals for all the vertices in the mesh?

Thanks

[CoDEmanX]

I assume what you are looking for is stored in bpy.data.loops[#].normal

[vicentecarro]

Thanks CoDEmanX, that’s exaclty what I wanted.

[alessandrozompa]

Hi, I was going to open an identical thread, so I thought to use this outdated one, in order to find a way to read the Custom Normals in Blender 2.91 using Python.

Thanks

[testure]

so did it work, or do you have a specific question?

[alessandrozompa]

Actually, it doesn’t work. There is no “loops” in “bpy.data”.
I thought it was “mesh.loops[#].normal” , but what I get is a Vector((0,0,0)).
I am using Auto Smooth and I’m editing the normals in edit mode, but the vector is always the same.
Maybe there is a method for working with bmesh, but I haven’t found it yet…
I tried with “bm.faces[#].loops[#].calc_normal()”, but I get the unalterated normal, and not the custom normal.

[testure]

here’s a similar post where I answered this question not too long ago:

Editing normals?

How can I edit normals through a script? I’m trying a basic thing just to see if it works: ob = bpy.context.active_object me = ob.data for v in me.vertices: if v.select: v.normal = Vector((0,1,0)) But the change to the normals don’t show up in Edit mode. If I change v.co the change shows up right away. What else do I need to do for normals?

[alessandrozompa]

Many thanks, I saw the method for reading them, but I didn’t realize that in order to read them I need to calculate with the function:
mesh.calc_normals_split()

Now it works, thank you very much