Spreading Crops LBM

[Annalysa]

Hello!

I wanted to make a peanut crop for my mod, using the farming redo api, but i wanted to
give it a little something, by using a lbm so that whenever it reaches stage 5 it will spread on a nearby soil node.

The thing is that i'm new to modding and lua in general so i'm a little confused.
This is what i have written so far, can somebody help me?
By the way the lbm is in the same .lua as all the crops stages, 5 in total and it grows.

Code: Select all

minetest.register_lbm({
 name = "sandwiches:peanut_spreading_lbm",
 nodenames = {"sandwiches:peanut_5"},
 action = function(pos, node)
  local soil_pos = minetest.find_node_near({x= pos.x, y= pos.y-1, z= pos.z},1,{"farming:soil_wet","farming:soil"})
  local above_node = minetest.get_node({x= soil_pos.x, y= soil_pos.y+1, z= soil_pos.z})
  if(above_node.name == "air") then
   minetest.set_node({x= soil_pos.x, y= soil_pos.y+1, z= soil_pos.z}, {name= "sandwiches:peanut_1"})
  end
 end,
})

[Krock]

I think what you need is an ABM, instead of an LBM: https://dev.minetest.net/Terminology
1) ABMs are triggered after the given time (and according to the chance parameter) in each mapblock. On the other side are the LBMs, which are only triggered when loading new mapblocks - either each time they load or only once in the entire map lifetime.

2) Another issue is that you're only checking one soil node, which then might always be the same position. This results either in spreading the plant only into one direction or not spreading at all (i.e. above_node == pos).

Give this code a try: (untested), quote this post to copy&paste the code with tabulators as indents.

Code: Select all

minetest.register_abm({
	name = "sandwiches:peanut_spreading_lbm",
	nodenames = {"sandwiches:peanut_5"},
	interval = 5,
	chance = 5,
	action = function(pos, node)
		-- Check 3x3x3 nodes around the currently triggered node
		pos.y = pos.y - 1 -- Find soil
		local soil_positions = minetest.find_nodes_in_area_under_air(
			vector.add(pos, -1), vector.add(pos, 1),
			{"farming:soil_wet", "farming:soil"}
		)
		if #soil_positions == 0 then
			return -- no soil found
		end
		-- Pick a random result
		local soil_pos = soil_positions[math.random(#soil_positions)]
		soil_pos.y = soil_pos.y + 1
		minetest.set_node(soil_pos, {name= "sandwiches:peanut_1"})
	end,
})

[paramat]

Yes use an ABM.

[Annalysa]

Ciao!

First of all, sorry, i'm a noob at modding: i thought that lbm triggered an action only once, as that's what i was
aiming at with the crop.
Now i created a 6ht stage so that the plant get "exhausted" due to the spreading and then stops.

Secondly: The code that you gave me was useful and i managed to successfully trigger the spreading, after some time.
This is the result:

Code: Select all

minetest.register_abm({
   name = "sandwiches:peanut_spreading_abm",
   nodenames = {"sandwiches:peanut_5"},
   interval = 5,
   chance = 5,
   action = function(pos, node)
      -- Check 3x3x3 nodes around the currently triggered node
      local soil_positions = minetest.find_nodes_in_area_under_air( vector.add(pos, -1), vector.add(pos, 1), {"farming:soil_wet", "farming:soil"})
      if ( next(soil_positions) ~= null) then
        local found_soil_pos = soil_positions[math.random(#soil_positions)]
		found_soil_pos.y = found_soil_pos.y +1
		minetest.set_node(found_soil_pos, {name="sandwiches:peanut_1"})
		if(math.random(10) > 5) then
			minetest.set_node(pos,{name="sandwiches:peanut_6"})
		end
	  end
   end
 })

In the end, Thank you.