solved Mod existing prefab Function

[MidrealmDM]

within the Shadowmeteor.lua is a function [ local function SetSize (inst, sz, mod ) ] which determines what items get spawned from meteor impact.

local function SetSize(inst, sz, mod)

Spoiler

 

    if inst.autosizetask ~= nil then
        inst.autosizetask:Cancel()
        inst.autosizetask = nil
    end
    if inst.striketask ~= nil then
        return
    end

    if sizes[sz] == nil then
        sz = "small"
    end

    inst.size = sizes[sz]
    inst.workdone = work[sz]
    inst.warnshadow = SpawnPrefab("meteorwarning")

    if mod == nil then
        mod = 1
    end

    if sz == "medium" then
        inst.loot =
        {
            { prefab = "rocks", chance = TUNING.METEOR_CHANCE_INVITEM_OFTEN * mod },
            { prefab = "rocks", chance = TUNING.METEOR_CHANCE_INVITEM_RARE * mod },
            { prefab = "flint", chance = TUNING.METEOR_CHANCE_INVITEM_ALWAYS * mod },
            { prefab = "flint", chance = TUNING.METEOR_CHANCE_INVITEM_VERYRARE * mod },
            { prefab = "moonrocknugget", chance = TUNING.METEOR_CHANCE_INVITEM_SOMETIMES * mod },
        }
    elseif sz == "large" then
        local rand = math.random()
        if rand <= TUNING.METEOR_CHANCE_BOULDERMOON * mod then
            inst.loot =
            {
                {
                    prefab = "rock_moon",
                    chance = 1,
                },
            }
        elseif rand <= TUNING.METEOR_CHANCE_BOULDERFLINTLESS * mod then
            rand = math.random() -- Randomize which flintless rock we use
            inst.loot =
            {
                {
                    prefab =
                        (rand <= .33 and "rock_flintless") or
                        (rand <= .67 and "rock_flintless_med") or
                        "rock_flintless_low",
                    chance = 1,
                },
            }
        else -- Don't check for chance or mod this one: we need to pick a boulder
            inst.loot =
            {
                {
                    prefab = "moonrocknugget",
                    chance = TUNING.METEOR_CHANCE_INVITEM_SOMETIMES * mod
                },
                {
                    prefab = "rock1",
                    chance = 1,
                },
            }
        end
    else -- "small" or other undefined
        inst.loot = {}
    end

    inst.Transform:SetScale(inst.size, inst.size, inst.size)
    inst.warnshadow.Transform:SetScale(inst.size, inst.size, inst.size)

    -- Now that we've been set to the appropriate size, go for the gusto
    inst.striketask = inst:DoTaskInTime(warntime, dostrike)

    inst.warnshadow.entity:SetParent(inst.entity)
    inst.warnshadow.startfn(inst.warnshadow, warntime, .33, 1)

 

end

In the section for the large items, I would like to insert this..
...
elseif rand <= 0.05 * mod then
            rand = math.random() -- Randomize which chessjunk
            inst.loot =
            {
                {
                    prefab =
                        (rand <= .33 and "chessjunk1") or
                        (rand <= .67 and "chessjunk2") or
                        "chessjunk3",
                    chance = 1,
                },
            }
...

However, I haven't been able to figure out how to modify an existing function.
Any idea?
Thank you

Edited May 25, 2019 by MidrealmDM

[CarlZalph]

A fairly straightforward method on doing this is to create a post-hook for it and do some checks for the outcome.

Caveat is that if Klei updates the code to change it for whatever reason, then the code may become nonfunctional.

 

AddPrefabPostInit the shadowmeteor prefab, and in the callback:

local SetSize_old = inst.SetSize
inst.SetSize = function(inst, sz, mod, ...)
    local retval = SetSize_old(inst, sz, mod, ...)
    if sz == "large" and inst.loot[1].prefab == "moonrocknugget" and math.random() <= 0.05 * mod
    then
        -- Code to edit the inst.loot table
    end
    return retval
end

The '...' and 'retval' are to help future proof the function in case something changes to have a return result or more parameters.

It won't help if Klei edits the drop table generation internally.

[MidrealmDM]

=-=-=-=-
After several test, I was able to get the chessjunk to appear!.

thank you.

 

Edited May 24, 2019 by MidrealmDM