ABM running only on blocks under Y=(some number here)?

[SegFault22]

Hey all, I am working on another mod. This mod requires that an ABM running in it only affects blocks below Y=13. I have searched everywhere, and can find nothing about how to make this work.
Any ideas?

[VanessaE]

Inside your ABM code, in the code where you take some action, add an explicit check there for pos.y < 14 just ahead of doing whatever action you had planned.

[SegFault22]

I don't mean to ask so many questions, but, what's an ''explicit check'' - and can you give an example to that dude who's working on the Minetest Online API, for future reference?
Thank you for your help.

[VanessaE]

If you have some code inside your ABM that actually does something, for example adding a new node somewhere, like this:

minetest.env:add_node(pos, {name = "widgets:fooblock"})

...then you would wrap it in a simple check routine, so your ABM might look something like this:

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Code: Select all

minetest.register_abm({
     nodenames = { list of nodenames to operate on },
     ...
     ... other ABM settings here...
     ...
     action = function(pos, node, active_object_count, active_object_count_wider)
          if pos.y < 14 then
               minetest.env:add_node(pos, {name = "widgets:fooblock"})
          end
     end
})


The idea is to check the Y position of the node the ABM is about to operate on before you actually DO anything to that node. If Y < 14 then do whatever you were gonna do, otherwise do nothing.

[SegFault22]

Ah, thank you :D
Now I can finish the crab mod and release v1.0...