File:Map Various Blocks 2.png

Hello everyone! Your friendly neighborhood Mojangsta Cojo here with some information about how map items will be different in 1.13 compared to past versions of Minecraft.

Choosing what to render on a map is tricky. Does everything show up? Only solid blocks? Partially solid blocks?

At their core, maps rely on heightmap logic to determine every top block in the world. Before 1.13, maps would sometimes not get the proper top block and we ended up with weird situations that really don't make much sense but became The Way Things Are™. Some blocks only showed if there was a solid block immediately below them. Others were either simply missing a map color (and thus did not show up) or had a map color and showed when they should not have. There of course were other super weird situations too, like placing a brewing stand on top of a stained glass block on top of iron bars on top of a trapdoor on top of a fence on top of a beacon on top of air, and nothing would show on the map at all. For the sake of consistency, and to reach a situation that makes sense for the future of Minecraft, we are making some changes to what shows up on maps.

Here is a spreadsheet (everybody loves spreadsheets!) detailing all the affected blocks + some other blocks that people might have questions about showing up on maps.

Spreadsheet

And here are some images illustrating some differences between 1.12 and 1.13 maps.

Image 1:

1.12 - Stained glass only showing whichever color has a 'solid' block below it.

1.13 - Stained glass shows whichever is the top block.

Stained Glass Comparison

Image 2:

1.12 - Various blocks without 'solid' blocks below them not showing at all on maps

1.13 - Same blocks showing on maps (except for the panes and iron bars, because they are smol)

Various Block Comparison

Happy Mapping!

https://www.reddit.com/r/Minecraft/comments/8xo1ex/minecraft_113_map_rendering_changes/ https://imgur.com/a/eV2lJk2 (https://web.archive.org/web/20230515232245/https://imgur.com/a/eV2lJk2)

Cojomax