Thank you for this. I'll definitely have to mess with wall tiles more. Remember the image you linked at the top of your first post? (The old parallax tutorial from VX), I always had trouble with that one when I started. I hope someone makes as detailed of a guide for ACE though, maybe includes the 'cheat sheet' scripts like map screensaver and such so people can have those parallax short cuts from the beginning. Parallaxing really produces great results, especially when you use tiles like these. Thanks for splitting them too, nothing more frustrating than trying to cut out a chair from a tileset that's made to be placed as a base, not used in parallax XDWall autotiles are divided into 16x16px corners, 32x16px vertical and horizontal sides (can be repeated), and the middle is 32x32px which is repeatable from any side.
Basically, what you do, is copy the wall, but don't include the far right or far left side (that is, if you're placing them horizontally, if you're stacking them vertically, then you don't copy the bottom), and then paste it every 32px.
Wall autotiles are easy to understand once you know how they're built. Here's an image to help you understand:
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Corners are NOT repeatable. The sides are only repeatable horizontally, or vertically. The middle is repeatable on any side.