Terraria – How to multiply Lava and water

terraria

In a recent post on planting alchemy ingredients on TerrariaOnline there is a mention of multiplication of lava. The post states the following:

this blackened area is the "temporary"
Lava multiplication wing. It can be
made longer if you want to, but it
works the same: put the lava near the
one-block high wall, let it pour for a
bit, and after pick it back. In
contrast with the water
multiplication, you need to wait a
bit, whereas waiting when
multiplicating water, will result in a
slow water-generating process.

This seems to indicate that there is a way to duplicate lava and water somehow. The instructions above seem to require some familiarity with that feature already, or at least they are not entirely clear to me.

Is there a way to duplicate lava and water in Terraria? If yes, how can it be performed?

Best Answer

The liquid physics in Terraria are not completely precise. You can abuse it to duplicate them. Good thing, too, since transporting a decent amount of lava/water anywhere is a huge pain.

  1. Infinite container: If you make a liquid container large enough, the amount that drains each frame is rounded down to nothing, for some reason. For example, a 49×25 liquid container with a 1 block hole will create an infinite amount of liquid (video example of this). This will break if liquids are settled (via the server console or when saving and loading the map).
  2. Liquid splitting: When a liquid falls onto a single block and could flow down both the left and right edge, it will. Somehow, this leaves you with more liquid in total than you started with.
  3. Bucket weirdness: Buckets create 1 block of liquid when they're emptied, but filling them seems to require less. If you place a block, let some of it flow and then quickly pick it up again, you will have a full bucket, but some of the liquid will remain.

Applying #2 and #3, this is a very simple liquid duping setup:

Simple liquid duping setup

The lava is placed on the edge, where it flows into both the container and the 1-block "basin" on the right side. Both "portions" are enough to be picked up by a bucket again (though in this case, the first scoop will be spread too thinly in the container).

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