Universal Fluid API for Minetest
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Universal Fluid API

This API adds support for fluid_buffers inside nodes. This means that nodes can contain fluid. Simple fluid transfer is also implemented in fluid_transfer. This mod implements node_io. Note that while it is recommended that you install this mod also, it is not required in order to function. Enable ALL the mods provided by this "modpack"!

How to Use

  1. Add the node to the fluid_container group.
  2. Add the following to the node defintion:
    fluid_buffers = {
        buffer_name = {
            capacity = 2000,
            accepts = {"default:water_source", "group:water_source"}, -- you can also set this to true to accept any fluid!
            drainable = true,
  1. Set the appropriate metadata.
  • buffer_name_fluid = string - Source node of the fluid.
  • buffer_name_fluid_storage = int - How much fluid there is in this buffer.

Just call fluid_lib.register_node(nodename).


All numbers are in milli-buckets (1 bucket = 1000 mB).

  • fluid_lib.get_node_buffers(pos)

    • Returns all the fluid buffers present inside a node.
  • fluid_lib.get_buffer_data(pos, buffer)

    • Returns all the information about this buffer.
        fluid     = fluid source block,
        amount    = amount of fluid,
        accepts   = list of accepted fluids,
        capacity  = capacity of the buffer,
        drainable = is this buffer drainable,
  • fluid_lib.buffer_accepts_fluid(pos, buffer, fluid)

    • Returns true if fluid can go inside the buffer at pos.
  • fluid_lib.can_insert_into_buffer(pos, buffer, fluid, count)

    • Returns the amount of fluid that can go inside the buffer at pos. If all of it fits, it returns count.
  • fluid_lib.insert_into_buffer(pos, buffer, fluid, count)

    • Actually does the inserting.
  • fluid_lib.can_take_from_buffer(pos, buffer, count)

    • Returns the amount of fluid that can be taken from the buffer at pos.
  • fluid_lib.take_from_buffer(pos, buffer, count)

    • Actually takes the fluid. On success, returns the source block that was taken and how much was actually taken.
  • fluid_lib.register_node(nodename)

    • Registers a node that has fluid buffers. This is IMPORTANT!
  • fluid_lib.register_extractor_node(nodename, nodedef)

    • Registers a node that can extract fluid from another node (in front of self) and put it into ducts.
    • fluid_pump_capacity variable in nodedef determines how much fluid (in mB) this node can "pump" every second.
  • fluid_lib.register_transfer_node(nodename, nodedef)

    • Registers a node that can transfer fluids. This is effectively a fluid duct.
    • duct_density variable in nodedef determines the diameter of the duct (custom node_box is created).
  • bucket.register_liquid(source, flowing, itemname, inventory_image, name, groups, force_renew)

    • Works exactly the same as the default bucket mod, except it adds callbacks to insert/take fluid from nodes.
    • inventory_image can be a ColorString.



See bucket/license.txt