This filter scans a region for a particular block, then swaps it for another block if the block above it is not air. Useful when you fill a space with a block that has a surface, like tilled soil.
Requested by @lemoesh
Explore the Lorenz Strange Attractor, the Chaos "Butterfly", in Minecraft.
Further reading - "CHAOS: The Making of a New Science" by James Gleick
A filter (WIP) that distorts blocks in space in a gravitational way. Configurable material and force strength.
Also added a 'Decay' feature that allows the map maker to cause blotches of corruption on the landscape.
Version 8 adds the ability to 'repel' and 'attract' in the same filter run using the 'Move' option. This is achieved by selecting different block types for each force type.
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