The Powder Toy

megamageiii

I'm sorry if this is a simple question, but I am new to Lua modding, and I am unsure how to make 2 elements mix. For example, if I wanted DUST and WATR to make CNCT, what line(s) would I need to put in? I could probably do something like 'if tpt.getproperty('type', x + 1, y)' for each of the sides of the particle, but I think there might be an easier way. Is there? And if there is, what is it?

boxmein

Something like this might work:

function newdustupdate (index, x, y, surround_space, no_type) 
  -- find WATR particles: 
  -- go over the moore neighborhood of the particle
  for part in sim.neighbors(x, y, 1, 1)
      -- if a particle in the moore neighborhood has the type WATR (expressed as an integer, 
      -- so tpt.element is used to convert the string "WATR" too into an integer)
      if sim.partProperty(part, 'type') == tpt.element('WATR') then
        -- create a concrete particle in dust's place
        -- edit2: jehkab one wuz heer 2, also fancy field_* constants!
        sim.partCreate(part, sim.partProperty(part, sim.FIELD_X), sim.partProperty(part, sim.FIELD_Y), elem.DEFAULT_PT_CNCT)

        sim.partKill(i)
        return 1
      end
    end
  end 
end
-- element_func is cooler than partProperty("Update",...) maybe
tpt.element_func(newdustupdate, tpt.element('DUST'))

jacob1

@boxmein (View Post)
returning 1 doesn't actually do anything besides skip the movement code. You still have to kill part i.

I would change that middle part to:

sim.partCreate(part, sim.partProperty(part, sim.FIELD_X), sim.partProperty(part, sim.FIELD_Y), elem.DEFAULT_PT_CNCT)
sim.partKill(i)
return 1

megamageiii

It says 'do expected near if' on the line with if, so I put a 'do' on the 'for' before it, and it fixed that, and then it said ''<eof>' expected near end' on the last end. I'm new to Lua, so I'm not sure what the issue is.

jacob1

it looks like he accidentally put an extra "end", try removing one of them.

megamageiii

I did that, and now DUST just destroys WATR and makes nothing.

jacob1

did you replace the inner if statement content with the thing from my post? It should work and actually make the reaction happen

Edit: maybe it still doesn't work ... i'll look at it later when I have more time

megamageiii

Actually, I forgot to put your edit in. This time it worked in making the CNCT, but the DUST wasn't destroyed.

EDIT:

I changed sim.partKill(i)to

sim.partKill(index)

and it worked! Thank you!

Make elements mix with Lua modding?