5
Two things to make it work.
1. Make your camera Orthographic
This will help you avoid distortion in corners, and will make it 'infinitely flat'.
It's like using an infinitely long lens.
2. Make the array 1:1 aspect ratio
Your chainmail array is ever so slightly taller-than-wide.
Move the rings a bit along the X axis, so they fit nicely.
Voilá. Seamless.
...
1
Your current bake setup is set to Normal baking. I believe what you're attempting to do (if you're following that tutorial) is either Combined or Diffuse (colour) baking.
1
To bake into an image you need to have it selected in the Node editor
you don't have to connect it to anything
just an image texture node then select the image you want to bake on and make sure that the node is selected
1
I got it now. The problem was that the floor and walls had their normal flipped. After I checked backface culling, this became obvious. Fixing the normal direction solved the problem.
1
Select "Diffuse" from the drop-down list
then click the "Color" button.
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