adding custom worldtypes round 2

src/lib/translations/en/wiki.json

@@ -113,6 +113,9 @@
 		},
 		"mappings": {
 			"title": "Customizing your Mappings"
-		}
+		},
+    "world_types": {
+			"title": "Adding World Types"
+    }
 	}
 }

wiki/misc/world_types/+page.yml

@@ -0,0 +1,2 @@
+title: wiki.misc.world_types.title
+index: 0

wiki/misc/world_types/en.md

@@ -0,0 +1,81 @@
+---
+title: Adding a Custom World Type
+index: 0
+---
+
+# Adding custom world types
+If your mod completely overhauls Minecraft's worldgen, you'll likely want to create a custom worldtype to offer users the option to use your worldgen or vanilla Minecraft's world generation.
+Now, what is a custom world type you may ask? *World types*, also called *world presets*, define world generation options for Minecraft worlds. They let you change the make-up of your Minecraft worlds by configuring how world generation behaves.
+
+Some examples of world types already built into Minecraft are "Amplified", "Super Flat", "Single Biome", and "Large Biomes".
+
+## Specifying which dimensions your world type applies to
+
+The following block shows how to specify which dimensions your world type will apply to. In `dimensions`, a `minecraft:overworld` object is required.
+The dimension `type` can be a built-in preset or a custom dimension preset you implement in your mod.
+
+
+`src/main/resources/data/minecraft/example_mod/worldgen/world_preset`:
+```json
+{
+	"dimensions": {
+		"minecraft:overworld": {
+			"type": "example_mod:example_mod_dimension_type"
+		}
+	}
+}
+```
+
+## Configuring how the worldgen works in your worldtype
+
+`generator` is where you specify how the worldgen in your world type behaves. The `type` is a "generator ID" and the following are valid generator IDs:
+ - `noise`
+ - `flat`: Creates a superflat world (not really applicable here)
+ - `debug`: Creates a debug world (not really applicable here)
+
+In `biome_source`, you specify how biomes generate. The `type` parameter here is what kind of biome generation will be used.
+Valid generation types:
+ - `multi_noise`: Similar to overworld generation
+ - `fixed`: Like selecting "Single Biome" in world creation
+ - `the_end`: This is the generation the end dimension uses (not really applicable here)
+ - `checkerboard`: Places biomes in a checkerboard style
+
+If the biome source `type` is `minecraft:multi_noise`, Minecraft will use 3D biomes in the overworld and the nether.
+The `preset` can be `minecraft:overworld` or `minecraft:nether`. More info about this can be found [in the article about custom dimensions in the Minecraft wiki](https://minecraft.wiki/w/Custom_dimension#Multi-noise_biome_source_parameter_list).
+
+`src/main/resources/data/minecraft/example_mod/worldgen/world_preset/example_mod_preset.json`:
+```json
+{
+	"dimensions": {
+		"minecraft:overworld": {
+			"type": "minecraft:overworld",
+			"generator": {
+				"type": "minecraft:noise",
+				"biome_source": {
+					"type": "minecraft:multi_noise",
+					"preset": "minecraft:overworld"
+				}
+			}
+		}
+	}
+}
+```
+This will generate a world relatively similar to that of 's default overworld generation.
+
+On a dedicated server, you navigate to your `server.properties` file and find the `level-type` field. By default, the value is `minecraft:normal`. Changing this to the ID for your world type (`example_mod:example_mod_preset`) will use that instead.
+
+## Making your worldtype accessible
+
+In order for your world type to show in the "create a new world" screen, you will need to make a file called `normal.json` in `resources/data/minecraft/tags/worldgen/world_preset` and populate it with the following.
+
+`src/main/resources/data/minecraft/tags/worldgen/world_preset/normal.json`:
+```json
+{
+	"values": [
+		"example_mod:example_mod_preset"
+	]
+}
+```
+This will make your world type show up in the world creation screen.
+
+Alternatively, if you want your world type to only show as an option while the user is holding down ALT, make a file called `extended.json` in the same directory as your `normal.json` file.