Here; I modified the walls' colour.

In fact, they are not whiter, but it seems to me they are easier to see that way...


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I also had the idea to put a little blurry zone on both sides of the paths. The idea was to make a smoother transition. But I am not happy as to how they turned out. It was tacked on after the paths were made, though, and the bump map and the grids to not follow them, giving them a weird aspect...

I think I will use try it later, though, but this time do it at the moment I am constructing the paths...