r/themoddingofisaac
Error when having multiple familiars orbiting around the player
u/quotee
This code works fine, but when I look in the log I get this error:

mirrorshield.lua:41: bad argument #1 to 'AddToOrbit' (EntityFamiliar expected, got number)
The problem starts to occur when I have more than one mirror shield at a time. Every one of them stacks on top of one another.

local mod = RegisterMod("Mirror Shield", 1)
local COLLECTIBLE_MIRROR_SHIELD = Isaac.GetItemIdByName("Mirror Shield")
local debug = true

local itemProperties = {
    VARIANT = Isaac.GetEntityVariantByName("Mirror Shield"),
    ORBIT_DISTANCE = Vector (65, 65), -- Distance orbital is from the player
    ORBIT_SPEED = 0.02, -- 0 < orbitSpeed < .1
    ORBIT_LAYER = 200
}

function mod:onRunInitialization()
    if Game():GetFrameCount() == 0 then
        if debug then
            Isaac.ExecuteCommand("spawn 5.100."..COLLECTIBLE_MIRROR_SHIELD)
        end
    end
end

mod:AddCallback(ModCallbacks.MC_POST_GAME_STARTED, mod.onRunInitialization)

function mod:init(shield)
  shield:AddToOrbit(itemProperties.ORBIT_LAYER)
end

mod:AddCallback(ModCallbacks.MC_FAMILIAR_INIT, mod.init, itemProperties.VARIANT)

function mod:onUpdate(shield)
  local player = Isaac.GetPlayer(0)
  shield.OrbitDistance = itemProperties.ORBIT_DISTANCE
  shield.OrbitSpeed = itemProperties.ORBIT_SPEED
  shield.Velocity = shield:GetOrbitPosition(player.Position + player.Velocity) - shield.Position
end

mod:AddCallback(ModCallbacks.MC_FAMILIAR_UPDATE, mod.onUpdate, itemProperties.VARIANT)

function mod:updateCache(player, cacheFlag)
  if cacheFlag == CacheFlag.CACHE_FAMILIARS then
    local shield_pickups = player:GetCollectibleNum(COLLECTIBLE_MIRROR_SHIELD)
    local shield_rng = player:GetCollectibleRNG(COLLECTIBLE_MIRROR_SHIELD)
    player:CheckFamiliar(itemProperties.VARIANT, shield_pickups, shield_rng)
  end
end

mod:AddCallback(ModCallbacks.MC_EVALUATE_CACHE, mod.updateCache)
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