Having trouble accessing a list (error: | Official Tabletop Simulator | Page 1

swift lagoon Feb 12, 2025, 10:52 PM

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Will post inside of this thread.

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What might be the issue here:

-- Data for coordinates 
local tileSpawnPositions = {
    ["0498ed"] = {
        { -- Rotation 0
            {-0.30, 1.10, 5.92}, {0.18, 1.10, 5.82},
        },
    },
}

list goes on, 8 valid GUIDs

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        -- GUIDs of the bags
        local bags = {"0498ed", ....}
    
        -- Get a random bag GUID from the list
        local randomBagGUID = bags[math.random(1, #bags)]
    
        -- Get the bag object
        local randomBag = getObjectFromGUID(randomBagGUID)
    
        -- Get a random object from the selected bag (which is the tile)
        local randomObject = randomBag.takeObject()
        local randomObjectGUID = randomObject.getGUID()

        print(randomObjectGUID)
    
        -- Define the target position for the object (place this in your desired position)
        local targetPosition = {-1.36, 1.09, -0.05}
    
        -- Define possible Y rotation values
        local rotations = {0, 45, 90, 135, 180, 225, 270, 315}
    
        -- Choose a random Y rotation value
        local randomRotationY = rotations[math.random(1, #rotations)]
    
        -- Set the position and apply the rotation
        randomObject.setPosition(targetPosition)
        randomObject.setRotation({x = 0, y = randomRotationY, z = 0})

        local index = math.floor(randomRotationY / 45) + 1

        -- Access the spawn positions based on the object GUID and rotation
        local spawnPositions = tileSpawnPositions[randomObjectGUID][math.floor(randomRotationY / 45) + 1]


        local bagGUID = "f826d1"
        local bag = getObjectFromGUID(bagGUID)
        
        -- Ensure the bag exists and spawn positions are valid
        if bag and spawnPositions then
            for _, pos in ipairs(spawnPositions) do
                -- Take an object from the bag and place it
                local takenObject = bag.takeObject({
                    position = {pos[1], pos[2], pos[3]}
                })
            end
        end

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Goal:

Have a tile taken from a random bag, positioned and rotated randomly.
Rotation is only in 45° steps, so 8 possible values.
Taking the rotation from the object after the random rotation is done, then divided by 45 to get a single digit integer. That is used to access the shown list at the top, to then get coordinates for precise spawn points.

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But print(spawnPositions) is the part where it logs 'nil', despite all other logs being just fine.

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Error message:

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Line 293 is

local spawnPositions = tileSpawnPositions[randomObjectGUID][math.floor(randomRotationY / 45) + 1]

green mist Feb 12, 2025, 11:02 PM

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swift lagoon Line 293 is ```Lua local spawnPositions = tileSpawnPositions[randomObjectGUID][...

Don't have a lot of time for this, but I'd recommend adding some logging directly before this line to make sure each part is exactly what you want it to be

swift lagoon Feb 12, 2025, 11:03 PM

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i logged all of the nested entries

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(if that's how you properly say that(?))

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i got what i expected

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but I might be on to it

vestal meadow Feb 12, 2025, 11:10 PM

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first thing to do is split your line up so you have only one table access at a time

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(as well as prove this is the error line, because sometimes it is not)

swift lagoon Feb 12, 2025, 11:12 PM

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I was careless with my syntax, that was part of the issue, I think I have that solved, but the nil value is still logged

vestal meadow Feb 12, 2025, 11:12 PM

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log(1)
local k = math.floor(randomRotationY / 45) + 1
log(2)
log("k = "..logString(k))
log(3)
log("randomObjectGUID = "..logString(randomObjectGUID))
log(4)
local tileSpawnPositionEntry = tileSpawnPositions[randomObjectGUID]
log(5)
log("tileSpawnPositionEntry = "..logString(tileSpawnPositionEntry))
local spawnPositions = tileSpawnPositionEntry[k]
log(6)
log("spawnPositions = "..logString(spawnPositions))

as an excessive example of how to debug this

swift lagoon Feb 12, 2025, 11:13 PM

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I'll check on all again

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👍

swift lagoon Feb 12, 2025, 11:39 PM

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    local tileSpawnPositions = {
        ["0498ed"] = {
            {
                {-0.30, 1.10, 5.92}, {0.18, 1.10, 5.82}, {0.64, 1.10, 5.69}
            },
            { 
                {-0.30, 1.10, 5.92}, {0.18, 1.10, 5.82}, {0.64, 1.10, 5.69}
            }
         }
      }

The data

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    print(tileSpawnPositions)
    print(tileSpawnPositions["0498ed"])
    print(tileSpawnPositions["0498ed"][0])
    print(tileSpawnPositions["0498ed"][0][1]) -- first error: nil
    print(tileSpawnPositions["0498ed"][0][1].x)

Logging it

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I didn't realize logging the first index isn't 0, but 1 instead.

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rookie mistake....

vestal meadow Feb 12, 2025, 11:59 PM

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😁

swift lagoon Feb 13, 2025, 12:08 AM

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        print(randomObjectGUID)
        local spawnPositionstest = tileSpawnPositions[randomObjectGUID]
        print(spawnPositionstest)

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Unfortunately it isn't over yet

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now I'm starting to think that the GUID as a variable isn't valid here?

vestal meadow Feb 13, 2025, 12:17 AM

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list goes on, 8 valid GUIDs
this is clearly not the case

swift lagoon Feb 13, 2025, 12:17 AM

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not in this case, I reduced it for this example

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to have some overview

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local spawnPositionstest = tileSpawnPositions[randomObjectGUID]

this is giving me nil because its just not right, despite randomObjectGUID being a valid GUID

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so I'm trying different ways right now, chatGPT says it's correct, but it obviously isn't

vestal meadow Feb 13, 2025, 12:18 AM

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😑

swift lagoon Feb 13, 2025, 12:19 AM

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where's the error?

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am I blind?

vestal meadow Feb 13, 2025, 12:19 AM

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using chatGPT for one 😅

swift lagoon Feb 13, 2025, 12:19 AM

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it knows more than me at this point

vestal meadow Feb 13, 2025, 12:19 AM

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let's prove some things to you, first of all

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        print(randomObjectGUID)
        local spawnPositionstest = tileSpawnPositions[randomObjectGUID]
        print(spawnPositionstest)

this isn't a very "complete" test of what you're doing

swift lagoon Feb 13, 2025, 12:20 AM

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for showcasing purposes, the first print is a GUID

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so I'd assume the second one would be as well, if there's an actual list called 'tileSpawnPositions'
and I did print all possible GUIDs as well to see if it exists

vestal meadow Feb 13, 2025, 12:20 AM

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        log("randomObjectGUID = "..logString(randomObjectGUID))
        log("tileSpawnPositions = "..logString(tileSpawnPositions))
        local spawnPositionstest = tileSpawnPositions[randomObjectGUID]
        log("spawnPositionstest = "..logString(spawnPositionstest ))

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prove what your table contains, then theorise, then prove again

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assuming is very useful, but only when you know what you are doing - if chatGPT knows more than you at this point, my advice is for you to stop assuming

swift lagoon Feb 13, 2025, 12:22 AM

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I'm sitting at this particular function for hours now

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this error breaks my spirit, and it's just basic knowledge I'm missing at this point

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it is late, I'll continue tomorrow

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thanks so far, I think I'll need to read a little about LUA lists

vestal meadow Feb 13, 2025, 12:23 AM

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what you could do with more than anything else is examples of how to break down a problem, as I am doing above.
come back to this with a clear head tomorrow but do run the code above and do consider the results

swift lagoon Feb 13, 2025, 12:23 AM

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I'll give it my best

#Having trouble accessing a list (error: