How would I detect if there is air under a part

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#1

Hello, so what I want to do is make a server script that detects if there is under a part called block and if there is unanchor the part.

It has to be a server script as it would cause to make lag.

If you could help then many thanks.

#2

Is this block on a grid? How many blocks are there? Are they consistent sizes? Raycasting works but depending on how you answer, might not be the best solution.

#3

Ok I got a model called blocks and all its children are called blocks.

What I need is a server script that detects if any there is any part called block and if there is air under it if there is that unanchor that part.

#4

So basically, you want to check if there is a part named “block” under the part right?
Use raycasting. Cast a ray downwards and simply check if there is an instance named “block” intersecting the ray. If yes, then unanchor the part.
Example code:

local part = YOUR_PART
local direction = Vector3.new(0,-5,0) -- five studs downwards
local raycastResult = workspace:Raycast(part.Position, direction) -- starting position, direction
if raycastResult then -- checks if the ray intersected anything
    if raycastResult.Instance.Name == "block" then -- checks if the name is block
        part.Anchored = false -- unanchors
    end
end

Also, Worldroot:Raycast has a 3rd optional parameter called Raycastparams which lets you blacklist some parts, ignore water etc.

#6

Like what @elomala said try cast a ray downwards using raycasting.
And if there is air then unanchor the part.

#7

What I mean is that I need a script in serverscriptservice that detects if there is air under a part called “Block” and if there is air under the part then unanchor the part called “Block”

#8

Do you know how I would do that I am kinda a noob when it comes to scripting.

#9

So “air” under the part means that there isn’t anything under the part?
If so then:

local part = YOUR_PART
local direction = Vector3.new(0,-5,0) -- five studs downwards
-- Also keep in mind if the part is too big you might want to lower -5 to something like -10 or so
local raycastResult = workspace:Raycast(part.Position, direction) -- starting position, direction
if not raycastResult then -- runs the code below if there isn't anything under the part
    part.Anchored = false -- unanchors
end

The code above unanchors the part if there is nothing under the part.
If “air” reffers to something else then let me know

2 Likes
#10

Where would I put the script because I need it in serverscriptservice because if I put it in each block it would cause too much lag.

#11

You can make this a function, and apply it to the parts you need it to be used for.

#13

Can I ask what type of game are you making?

#14

A destruction game why?

Char limit

#15

Following code runs through all of the parts given in a table. You can also just put the parts in a folder and use :GetChildren() instead of specifing each part

You can put it in serverscriptstorage

local parts = {part1, part2, part3} -- table with all of the parts

local direction = Vector3.new(0,-5,0) -- five studs downwards
for i,v in pairs(parts) do
    local raycastResult = workspace:Raycast(v.Position, direction) -- starting position, direction
    if not raycastResult then -- runs the code below if there isn't anything under the part
        v.Anchored = false -- unanchors
    end
end