Table item added/removed

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#1

Hello

I am attempting to make something that detects if an object has entered a specific zone. And fire it like an event. For example of the tables:

local Objects = {
        {Object = workspace.Baseplate},
        {Object = workspace.Part},
        {Object = workspace.Wedge},
}

And it will keep resetting the table for all parts within a certain radius.
For ex:

local Objects = {
        {Object = workspace.Baseplate},
        {Object = workspace.Part},
        {Object = workspace.Wedge},
}

--Next scan
local Objects = {
        {Object = workspace.Baseplate},
        {Object = workspace.Part},
        {Object = workspace.Item}, --Something new
}

and I would like to figure out which elements are missing or added.

#2

You could use WorldRoot | Documentation - Roblox Creator Hub if you’re fine with a rectangular “zone”.

Or you could use this module for other Region3 shapes: Rotated Region 3 Module

Or you could write a relatively simple function that checks descendants recursively for their center positions. This has the downside of not taking into account parts that are only partially inside the sphere “zone”.

#3

I’m actually looking for a fully spherical region. So magnitude would be much more efficient, however, I am attempting to detect if a new part has entered the radius.

#4

Not sure why you’re encapsulating these Objects inside a table {Object = Instance}. Seems unnecessary.

But I digress, do you have a specific list of instances you’d like to check? Because scanning the entirety of workspace would be a huge performance issue.

#5

Actually reading over @nicemike40’s reply. That module he recommended includes Spherical Region3s.

#6

Ah, I actually omitted the distance and Unit indexes for the table.

However, my original question still stands, is there any way to detect a new value in a table (not dictionary) and a missing value.

#7

Unfortunately as far as I am aware it is not possible to do this with just a normal array, you’d have to use __newindex on a dictionary with metatables.

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#8

Oh, that’s unfortunate. I thought about putting it in a dictionary, but decided to ask around if there were any alternatives.

Thank you for the help!

1 Like