Tile Rules do not take into account other tiles in same tilemap

[nicbiondi]

Rule tiles do not take into account positions of other tiles in the same grid even if they are on the same tilemap. It would be nice to have a toggle to allow rules to take other tiles (non rule tile or normal tiles) into account when deciding which sprite to use.

[edwardrowe]

On our project (Sparklite) we modified the RuleTile to have what we call "sibling" tiles. When deciding if a rule matches, instead of just comparing to 'this' we also see if it's a sibling.

[edwardrowe]

We also have siblings PER RULE but I'm wondering if that's a hack cause it feels hacky.

[nicbiondi]

Dang nice work edward!
let's hope this project gets some more love. It really is a beauty. I would also accept giving the Generic Rule tile more than 9 siblings. I know this would be overkill for some uses but for mine it would be nice to be able to set rules for two away rather than just one distance.

[ChuanXin-Unity]

Checking for other types of tiles or extending the distance of checks is certainly possible, but we wanted to keep the use of the current RuleTile simple.

Lets see if an extended RuleTile would make sense.

[nicbiondi]

Hi ChuanXin, I agree with this. the default version should be simple to grasp, and it is! This is the first time I have used the RuleTile and ran into the issue of needing to extend the functionality so I thought I would mention it as I believe it will be necessary for many users.

[johnsoncodehk]

I agree that we should keep the current RuleTile simple to use.
I made a version that is extensible and backwards compatible, allowing you to customize fields and rules.

Extension code (Update with 16/6/2018):

public class MyTile : RuleTile<MyTile.Neighbor> {

	public bool customField;

	public class Neighbor : RuleTile.TilingRule.Neighbor {
		public const int Null = 3;
		public const int NotNull = 4;
	}

	public override bool RuleMatch(int neighbor, TileBase tile) {
		switch (neighbor) {
			case Neighbor.Null: return tile == null;
			case Neighbor.NotNull: return tile != null;
		}
		return base.RuleMatch(neighbor, tile);
	}
}

[johnsoncodehk]

I have submitted a pull request for this requirement: #37

[nicbiondi]

ooh nice! is this pulled? I can't seem to tell. thanks for this!

[johnsoncodehk]

This branch can be found here:
https://github.com/johnsoncodehk/2d-extras/tree/rule-tile-extend

When the author did not confirm the merger of these changes, I suggest not to update it for the time being because everything may change.

[Moonboss]

** Desperate Noob Here **
I'm a hobbyist, and trying to create random tilemap generation, but don't know where to start. I've tried to absorb as much as I can of the 2D Extras, and Unity videos. I have some questions, and ANY help is welcome!

1. to johnosoncodehk, or anyone that can answer.. can you decipher the line:
   public class MyTile : RuleTile<MyTile.Neighbor> ?
   I understand basic inheritance, but what I don't understand is the <MyTile.Neighbor> part. Inheriting from something that has a List argument? I'm new to that statement construction.

2. For learning how to actually produce my own code for Rule Tile scripts, where do I start? i've found a couple videos (specifically Jay Santos' video), and the 2D Extras material, but what else is out there? where should I look for examples/guidance? I've searched and searched and came up with very little.

My End Goal: develop a tile randomization script that will generate custom maps, based on normal tiles and rule tiles. So that in a sense, i'm able to create biomes and coastlines and such that make sense.