Here's a picture to help. Notice that the "wall" is slanted. I want something completely vertical. Straight up and down. Is this possible?

Here's a picture to help. Notice that the "wall" is slanted. I want something completely vertical. Straight up and down. Is this possible?

Not without using a placeable. The terrain can't be vertical. If you want to have a vertical terrain you can use Terracoppa to rip the terrain along a line, which allows you to have a "completely vertical" but you need to use a placeable to hide the torn terrain. You could then retexture a vertical placeable such as the tileblock and give it the texture you mean the vertical bit to have.
That's cool. That's kind of what I thought, but wanted to make sure.
I figured out a way to do what I wanted to do, so it's all good.