Liquid

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Liquids are special dynamic blocks in Minetest.

Liquid forms

Liquids usually come in two forms: In source form and in flowing form.

Liquid source

Liquid sources have the shape of a cube. A liquid source will generate flowing liquids around it from time to time, and, for renewable liquids, it also generates liquid sources (see below).

Flowing liquid

Flowing liquids take a “sloped” form and never the shape of a cube. Flowing liquids spread around the map until they drain. A flowing liquid can not sustain itself and always comes from a liquid source, either directly or indirectly. Without a liquid source, a flowing liquid will eventually drain out and disappear.

Liquid properties

All liquids share the following properties:

All properties of blocks
Renewability: Renewable liquids have the property that new sources can be created (see below)
Flowing range: How many flowing liquids are created at maximum per liquid source, it determines how far the liquid will “spread”. This is a number ranging from 0 to 8. If 0, no flowing liquids are generated at all. Usually, liquids have a flowing range of 8
Viscosity: How slow players move through it and how fast new flowing liquids are created (i.e. how fast the liquid spreads)
Drowning damage: If set, it will a) reduce your breath (“bubbles”) while you are inside and b) will cause this amount of damage to you every 2 seconds if you ran out of breath while inside

Creation of liquid sources

Renewable liquid create new liquid sources at open spaces. A new liquid source is created when:

Two renewable liquid blocks of the same type touch each other diagonally
These blocks are also on the same height
One of the two “corners” is open space which allows liquids to flow in

When those criteria are met, the open space is filled with a new liquid source of the same type.

2 liquid sources (S) touch each other diagonally, but are seperated by solid blocks.
The solid block at the top “corner” has been removed and a completely new liquid source block fills the empty space shortly after.
For comparison, a non-renewable liquid just flows (F) instead.