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In this show, we're setting up our rule tile rules, which is going to be super exciting.

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It's going to allow us to paint things into our world, to use rules, to say what tile should be placed

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in what particular square so that it looks nice and lovely.

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So let's get started.

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First step we need to go to package manager and search within the Unity Registry.

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Make sure you're selected on that.

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Might take a moment for it to think.

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Yep.

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Then it's cool.

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Search for tile.

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If you see in here tile map extras.

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That's where we can find the rule tile.

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I'm going to click install on that.

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It's kind of hiding over the edge a little bit.

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The install button.

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Now in the future, you might not need to install this.

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It might come standard with unity, but for now you need to do that.

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If you're not finding it, particularly if you're using an older version of unity, you might need to

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click on the cog, go to advanced project settings and enable the prerelease packages.

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Sometimes when the packages are still having the bugs ironed out of them, you need to go and enable

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that.

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But now we've installed that.

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What I can do is back onto my scene in my sprites folder.

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I'm going to right click and create 2D tiles and then you'll see now we've got rule tile that drops

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a rule tile in here.

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I'm going to rename that just simply rule tile.

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I'm just going to have one in my scene.

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So I don't need to give it anything more fancy than just calling it rule tile.

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Why have I got this in my sprites folder and not my tiles folder?

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Well, I'm going to be doing a lot of backwards and forwards with this particular sprite sheet in here.

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And so I want to have easy access to this rule tile, but in the sprites folder just means things are

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next to each other, which is handy.

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Now I need to actually place the rule tile on my palette so that I can use it in my world.

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I can't just click on this in my project directory and start trying to paint it around.

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It needs to be on a pallet and to do that I'm going to put it on the platform's palette.

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But you could, if you wanted to create a new palette that is just the rule tiles palette.

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If you wanted to do that, if you wanted to know exactly where it is.

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But I find switching between the palettes is a little bit of a pain.

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When you've got a small project like this, I'm just going to grab the rule tile and drop it right at

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the top and it looks like we've got something a little bit buggy that's got introduced into there.

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That's fine.

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We won't worry about the bug at the moment.

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Thank you.

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Unity for your bug.

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We've got our rule tile but I dropped it in but I can't see it.

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It's not in there.

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It's invisible.

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That's because we haven't given it a default sprite.

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So make sure you clicked on rule tile from down in your directory and then over on the inspector you

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can see we've got this default sprite, you can click the select button or you can just go to where

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you know the assets are and find what you want to have as the overall look for this and the default.

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If no other rules apply, then apply this one.

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It's going to grab one of my green grass, drop it into that little area there.

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Now our our rule tile has a look to it and blink in our palette.

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You can see that it appears if I click on the rule tile from the palette, jump over into my scene anywhere

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in here and just paint this down.

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You can see it's painting that one default tile that I've got.

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So once again, make sure you clicked on your rule tile over in the inspector.

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You can see that the tiling rules, the list is empty.

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This is where we're going to give logic to the rule tile click.

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Plus, we'll put in our first piece of logic, which will be, let's see, I'm going to find my empty

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kind of in the middle of things tile, which is this one in here.

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Also, if I show you my sprite sheet, it's this just plain color in there.

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I'm going to click and drag that over the top of the selection.

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And now you can see everything has changed color.

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So what do we want to do?

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Well, we want to have this tile be present when it's surrounded.

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So my little example in the palette over here, you can see that we've got something on the outside

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of this one tile just in the middle here.

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Let me click on that.

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This tile here, we've got something there, something there, something there and so on.

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So overall now rule tiles, you can click in the little grid and you can get an arrow which says, yes,

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there is something in that space.

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So you can see the arrows in the top left corner.

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That means that there yes, there would be another adjacent tile on the top left corner.

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Or you can turn that into an X that says, no, there can't be anything there.

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If there is no tile there, then this rule becomes valid.

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So what I'll do is just put an arrow all the way around the outside.

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Later on we'll see that we don't need these corner ones.

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But for now, let's do what makes sense.

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And it says if there's something surrounding this tile, then hey presto, this is the tile that it

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becomes.

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Just click back on the rule tile and if I go and paint up the top pair, you can see it's magically

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changing.

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What happens?

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It's saying, Oh, I think you want to have this particular tile based upon your rules.

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Okay, let's set up another thing.

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We'll do the corner.

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We'll do the top left corner, which corresponds to this particular tile up here.

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You can see we've got the corner in the top left is different at the corner in the bottom left, you

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could just do the same.

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But this top, the bit you jump on looks a little bit different.

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It's a bit more faded down the bottom.

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So we've got a top left and a bottom left.

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We've got these side ones, got the top ones, and all these ones here that have a solid edge on the

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left and the right is when you just have a single tile poking up in the air.

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Likewise this these ones are when you just have a single part tile poking left and right.

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So let's click on plus add a new rule and this new rule.

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What do we want the tile to be?

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Well, let's find.

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The very first one here, the top left corner dragged that on over.

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What are the rules for the top left corner?

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Let's have a think about that.

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So this top left corner here, there's no tile there.

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There's no tile there.

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That's a little bit misleading.

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As my cursor pretends there's a tile.

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Let me click on something that's not a tile.

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There we go.

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Nothing there, nothing there, nothing there.

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So let's go and put an X in the top left, an x right above and an x right to the left of it or left

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to the right of it.

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And then we do have a tile to the right, a tile to the bottom right and a tile below.

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So we'll put an arrow and arrow and arrow.

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Now there's not a tile here, but there might be.

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So in that instance we'll leave it blank because I'm not sure yet.

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Maybe if we were to paint a tile there, we still want this to be a corner.

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So if it's a doesn't matter whether there's a tile here or not, then you just leave it blank.

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As I've done there.

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Click back on the tile and make sure this works okay.

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Yeah.

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You can see as I paint one there, it currently doesn't have a tile to the right of it.

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That's why it's staying in that default shape.

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But as soon as I put a tile to the right, the rules apply.

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You've got nothing left, left, left, and you've got something.

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Right, right, right.

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So the right and the bottom.

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Right and the bottom.

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Now, something cool that we can do here instead of having to go through our whole flippy sequence we

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did last time.

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Which side note it seems to have broken itself.

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I'm not sure why.

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Might need to go in and reapply that because it's misbehaving.

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But I don't need to do that at the moment.

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We're going to transition in and rule tile.

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So most of this what we can do over here and say, well, this same rule I want to apply if this is

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in the top right as well so I can click on the rotation.

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So right in the middle you see there's a little gray symbol, it's a dot, then it goes to a curved

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arrow, a left or right arrow and up B down arrow, and then the up B downy and lefty right together.

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So the dot means just keep it as is the curve.

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Arrow means rotate.

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That means rotate 90 degrees, 99 degrees.

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So to do that the entire way around now you can see by doing that, we've got top left.

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Just click off this again.

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Top left is a corner.

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Top right is a corner.

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Also, if we go down the bottom here and say bottom left is a corner and bottom right is a corner,

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because that's what happens when you rotate it.

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You can get all this power just by adding one tile.

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You don't need to add all these rules all over again because it's rotating what the rules are as well.

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Now, I don't want it to apply to the bottom left and bottom right because we've got the this bottom

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corner.

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So in this instance, I'm going to do just a mirror on the x axis.

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If I was to click it again, it'd be mirror on the y axis, click it again, it'll be mirror on the

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X and Y and back to the dot.

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So just on the x axis, that means it's applying to the top of our corners.

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Now let's apply the bottom.

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So click on the plus again ad and then we will find what is the bottom left.

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I think this is the bottom left corner just here looking like that.

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So just a reminder that one just there you're looking for from your tile set, if you're using the same

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tile set as me, that is drag that on over.

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Now I will say what the rules are.

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Once again, we'll hop in here and find it.

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Well, there's nothing in these bottom pieces.

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So X, x, x, and then there is in the ones adjacent to it in the top, top, right and right.

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That should make our corners.

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Yeah.

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And then we'll do mirror on the X once again.

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That means over there it should be valid.

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If I jump in and just click on the rule tile, do a little bit of painting around.

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Yeah, it looks like it's all behaving itself pretty well.

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What's not behaving itself well just yet is you can see our bottom is not working, so we need to be

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applying the bottom tile.

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Our right isn't working, our lift isn't working and our top is well.

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It's kind of working, but not the way we want it to because it's just applying this green single square

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one.

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I think I might want to have a little bit of random.

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So it's sometimes green and sometimes blue because I've got both of those tiles in my tile set when

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we've just got this long flat platform.

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Let's see if we can figure that out.

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How to do some randomness.

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So we'll click.

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Plus again, I want to add a tile.

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This time we will change from output from single to random and in random.

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How many of these do we have?

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We've got one, two, three green pieces and we've got one, two of the blue pieces.

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So I'm going to change this to be five in terms of how many things we have.

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And you can see when we put it in there, it's got a whole bunch of blank spaces because it's randomly

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choosing between this rock and nothing.

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So let's go and grab in our other sprites, the other green sprites, one, two, three, and then a

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couple of blue sprites, one and two.

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Now they should all be filled in.

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So sometimes they're going to be green, sometimes they're going to be blue.

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You can do a little bit of additional randomness.

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So we could mirror on the X, which will make these tiles flip, which is kind of interesting to do.

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You can mirror them on the Y, which you don't really want to do.

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It makes them upside down.

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But if you wanted to get a whole bunch of additional randomness and variability in there, that's a

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cool thing to do.

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So we've got that our tiles are being placed in.

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Let's just see if we can draw a bunch and see if we get this random inverse.

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Random.

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Yeah.

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So we got a little bit of random.

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They're green, blue, blue, green, green, blue.

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Because we've got three greens and two blues.

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There'll be a little bit more green, but that's okay.

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There's a little bit of grass growing in our world and it's happening in a round.

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Way, which I quite like.

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Now we need the rules for this.

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Okay, so what's the rule?

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Well, when it's a top title, they'll definitely be nothing right above it.

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So an X there, there is going to be something below it.

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So that's pretty much all we need for the titles.

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Now, is there something to the left, maybe something to the left there?

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Maybe not sure yet.

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We'll figure that out as we go.

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As we add in more titles, you can see it's a little bit broken over here.

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So maybe we do need to add something saying that.

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Yes, there's something to the left.

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Yes, there's something to the right.

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Okay.

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It's nearly there.

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Oh, we don't have our side pieces yet.

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That's why it's looking a little bit funky.

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Our default piece is, is that grass that's white looking a little bit weird, but we're making good

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progress and we've still got a bunch more rules to set up.

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So I'm going to give this to you as a challenge to finish your rule tiles, finish setting up your rule

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tiles so that all the shapes and positions work and look good.

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And using your rule tiles create a couple of simple platformer layouts, just a couple of jumps and

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a couple of gaps to jump over to show that it all works.

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Maybe some single things up in the air.

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What I mean by that, they're the tricky ones.

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So a couple of these single things and a couple of single sideways things as well to make sure you get

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the top and the bottom on that.

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And just one quick thing before we start our challenge.

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The order that things appear in the list is the priority that they're given.

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So whatever is at the top will be the rule that's enacted first.

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So if you find that things aren't quite lining up, try dragging things up and down in the order just

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to see if that changes it.

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Putting it as a higher priority might fix whatever troubles you are having.

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Okay, so jumping into the challenge, see you back here when you're done.

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Okay.

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Welcome back.

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I've gone ahead and created all my rule tiles.

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Now, what I've found in the past is that people say to me, Oh, he went so quick through the rule

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tiles, what were they?

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How did you do them?

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And so what I've done is created a little screenshot here of my rule tile rules.

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I've given this to you as a jpeg.

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So this particular image here, so you can go through and see exactly what I've done.

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You can see what the rule tiles are.

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If you want to do this just on the video, then I'll hold it on that bit.

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You can pause and then we'll go down to this bit.

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You can pause and have a look at that and check what I've done, and then I'll jump down here and you

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can pause again.

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I think that captures it all.

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Just to note, there's a couple of places where you don't have to do randomness, but I did so I did

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some randomness on Let's See, on our flat with the grass top.

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We talked about that already in the video.

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I did some randomness on the bottom, randomness on the left, because these are things that I had multiple

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assets for.

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So I just drop those in so that we could do that.

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And also a little bit of randomness on the overall tile here, the middle tile in the middle.

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I just randomize between the straight up solid color and the solid color with the bumps on it.

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If you play around with a noise that just changes where the randomness appears, you can get some different

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looks if you like.

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Oh, that look wasn't quite right for me.

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Then you can play around with the noise to get some different looks there.

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Some other things I'll note is that I needed to drag up to the top.

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Let me get my image back for you so it's easier to see needed to drag all the way up to the top.

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This corner piece I found that made the most sense in terms of having that rounded corner piece actually

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show up that corner piece.

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I mean, is this one just in here, this rounded edge piece in here?

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I had to do a lot of drawing.

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What happens when I go up like that?

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Because there's a whole bunch of these rules for if you have something just sitting on its own and you

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can see this is the sitting on.

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So there's Xs all around the outside.

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What happens if something is just sticking out from the side like that?

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That's this piece just here with the Xs and the arrow.

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I've mirrored on the x axis for these ones.

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So that you see the same thing appears when we have it over on the right.

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Also, what happens if we have something sticking out of the top?

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That's this one here.

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And similarly, if we have just a pillar rising up in the air, that is that one here as well.

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Likewise the pillar on the horizontal.

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So we've got those things there.

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The one that I've got right down the bottom is this kind of middle padding stuff.

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Once you make a box all the way around the outside, then this one right in the middle here is going

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to be the catch all rule.

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Catch them right down the bottom.

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I think that's most of what I did in terms of the changes.

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A couple of little tweaks I put in this piece here, which is the has the solid top.

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Then just a couple of dots because I was finding there are a couple of places where we needed that.

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Where did that show up?

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Oh, there we go.

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This is this bit over here.

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So when I have just that little square in there, there's nothing above it.

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There's something to the right, there's something on the left, something below than I needed to have

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this particular tile in there.

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If I didn't have that, then it went a little bit weird.

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Or if that was dragged all the way down to the bottom, then it just placed in that weird, just straight

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up flat tile at the top.

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So I put this all the way second from the top.

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Now that gives that priority over our other rule, which is just our flat top platform rule.

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So there we go.

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That's all my rules.

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I'll give you that as a downloadable so you can see the image.

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You can also go to our repo for any of our lectures.

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Just a reminder and you can go and download or grab or clone this specific commit that I've made where

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I'll have all of my rules.

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So hopefully you've found that a fun experience.

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I love the fact that we can just slap down our platforms however we like, and I will see you in the

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next lecture.