Fixing vertex normals after cutting mesh with Knife - how ?

I have a terrain mesh that I need to cut into chunks and then create LODs for each chunk. The issue is that after I cut my terrain mesh with Knife tool, you can clearly see seams between chunks since Blender recalculates vertex normals.

How can I edit vertex normals on the chunks so that seams are no longer visible ?

Thanks

Terrain mesh before being cut:

After being cut:

Attachments



bake your normals before you cut.

If you mean to bake normal map, it doesn’t work like that - I still see shading issues where chunks meet each other.

it’s hard to tell exactly what you’ve done without seeing the blend file but try this; keep the old mesh intact then use the data transfer modifier on all the new objects to copy vertex normals from the original mesh