This is addon for CubicChunks which allow you to generate dimensions from your modpack in one dimension layer by layer.

When you creating new world select world type "DimensionalLayers"
Its possible to configure what dimension will be at what layer, some settings per layer and save preset.


First enter to world may take ~5 mins, so dont worry, just wait. Also recommended to use something like WorldBorder for pre-generate map.
Recommended to use CubicChunks 1271 or later
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Video dev log: https://youtube.com/playlist?list=PLwlzJC9LWHVv9gmAq86vN2b9ABrWdeQEs&si=ZnBxDbl8M8vH8NcW
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If you wanna to register icon of your dimension which named "<modid>:<name>", you should to put texture at assets/<modid>/textures/gui/dimension_layers_background/<name>.png
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Gratitudes: