I use Blender to model walls. I render 2d sprites of these walls in a (gaming) isometric perspective.
My problem pertains to the "edges" of the 3d wall:
On both left and right ends of the frontal plane of the wall, I get 1 pixel vertical lines that are brighter than their neighbour pixels. This happens to all of my walls.
In the 2d iso world, when I place two sprite walls next to each other, I get a visible vertical line between the walls:
I tried to increase the 2d sprite width by 1px but then I lose the pixel-perfect grid alignment, depending on the wall texture, you see that they are overlapping too much, and have some ugly overlap when I build wall corners.
Then I thought the brightend-up edges of the walls are caused by the scene light in Blender. Eventually, I turned off the light. There is still a visible vertical line:
So worst case: I do not know the cause or a solution (other than manually editing each 2d sprite).