World Preview

# World Preview *World Preview* is a mod for visualizing Minecraft world seeds before they are generated. ## Installation Just download the latest *World Preview* JAR file for your ***exact*** Minecraft version. Additionally, ***always*** ensure that you are using the correct version for your modloader (Fabric/Forge). Then save the downloaded jar to the `mods` folder of your Minecraft instance. Finally, if you are on Fabric you also need to download the [Fabric API](https://modrinth.com/mod/fabric-api). ## Usage *World Preview* adds a new `Preview` tab to the Singleplayer menu. Upon opening that tab, a random seed is selected and a map of biomes is generated: By default, the overworld dimension will be generated, structures will not be shown and no heightmap will be generated. This can be changed in the Settings (top-left button in the `Preview` tab). When structure sampling is enabled, the visibility of individual types of structures on the preview can be toggled: When height sampling is enabled, the preview can be toggled between the biome map and a colorized heightmap: When y-layer intersection sampling is enabled, the preview can also show the blocks on the current y-layer. Additionally, the y-layer one step below is also shown in a lighter color: Since version 1.1.0, there is also experimental support for opening the preview in-game for a single-player worlds: ##### Moving on the preview Clicking and dragging on the map-part of the preview tab will move along the x and z axis. This will cause the following load sequence: - Any biomes that are not yet sampled on the current y-level - Structures (if enabled) - Height map (if enabled) - Adjacent y-layers (if enabled) Scrolling does **not** zoom into the map (there is a separate setting in the configuration menu for controlling the zoom level), but instead travels along the y-axis. This allows cave biomes to be seen as well. Please note that non-cave biomes span the entire world height beyond that. ##### Other features - Works with mods! Tested with: - Terralith - Biomes O' Plenty - Persistent seed storage - Highlighting specific biomes - Highly configurable and extendable ## Supported version This table shows the current support status for the Minecraft version. | Minecraft Version | Status | |-------------------|-----------| | `1.20.x` | Supported | ## FAQ **Q:** *Will Minecraft versions before 1.20 be supported?* **A:** No. --- **Q:** *Will Multiplayer be supported?* **A:** No. --- **Q:** *Scrolling does not zoom the preview!* **A:** Scrolling moves the y-level up and down. To change the zoom level, go to `Settings (top left wrench) -> Resolution` and change the visual size of a chunk. --- **Q:** *The preview is completely white / black for the y-intersections view.* **A:** This is likely because the starting y-layer for the preview is the build limit. Try scrolling down to a lower y-layer and something should show up. --- **Q:** *My CPU is at 100%!* **A:** You can limit the number of used cores in `Settings (top left wrench) -> General`. By default, *World Preview* tries to compute the biome preview / structures / heightmap as quickly as possible. These calculations require a lot of CPU power. ## Mod incompatibilities This mod should be compatible with most mods (including those adding new biomes and dimensions). ### TerraFirmaCraft (TFC) World Preview **is** compatible with TFC, however, there is a known issue: The Y intersections view will always be a white screen for all Y levels with TFC, because the `TFCChunkGenerator` has a dummy implementation for the [`getBaseColumn`](https://github.com/TerraFirmaCraft/TerraFirmaCraft/blob/v3.1.2-beta/src/main/java/net/dries007/tfc/world/TFCChunkGenerator.java#L643-L646) method. To clarify: This doesn't mean that TFC is broken / does something wrong (it clearly works on its own and does its job). It just means that TFC does not provide the specific information World Preview needs in this case. ## Adding support for new biomes and structures New biomes, structures, and more can be registered via the Minecraft datapack mechanism. See [the World Preview dataformat docs](https://github.com/caeruleusDraconis/world-preview/blob/1.20/DataFormats.md) for more information.