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atlas.terrain as of 1.21.111.
atlas.terrain is a texture atlas used to store block textures.
Format
This section is missing information about:
Is it deterministic like Java Edition's?
If Minecraft Earth was based on the BE engine, does it also have this atlas?
Does Minecraft Education have the same atlas as Bedrock Edition?
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atlas.terrain is a 2048×1024 pixel file that is split into 16×16-pixel squares with 8 pixels of padding for blocks. It is generated from terrain_textures.json in alphabetical order when a world is joined. If a texture is referenced multiple times, it will appear once in their first spot. If a broken or nonexistent texture is referenced, a missing texture will appear in its spot, even if there is a different missing texture before. This does not necessarily mean that the missing texture ends up being visible in-game for relevant such blocks.
Any textures added to terrain_textures.json in resource packs will be added to atlas.terrain, including ones in add-ons and when Minecraft Education features is enabled.
Viewing
This section is missing information about:
method to export or even just see the atlas from versions a0.15.0-b1 to 1.1.7 without external programs
method to get mipmapped versions without external programs
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You can obtain the file by using a structure block set to 3d export mode There has to be a semi-transparent block like stained glass to export the right image. You can then convert it to a OBJ file and take out the correct one.[more information needed]
It can also be viewed by using a resource pack to change items_texture.json to use atlas.terrain for the texture name. This will cause items to use the wrong atlas.[more information needed]
External programs
This section is missing information about: can this be used to obtain blocks-atlas and items-atlas from 13w18a to 13w37b? From testing it crashes in older versions.
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Using external programs such as RenderDoc, you can obtain the texture atlas and its mipmapped versions. The image needs to be flipped vertically after being downloaded as a png.