Client Side Placement System Troubles

[past grove]

How can you perform WorldRoot operations (e.g. GetPartsInBox(), Raycasting, those types of operations) on the client side without being forced to constantly communicate back and forth with the server? (obviously you must communicate with the server when you place a block, talking about when you move your mouse and the ghost block moves it needs to detect other blocks around it to ensure the block which can be rectangular does not phase into others) Thank you in advance.

[simple crane]

workspace:GetPartsInPart()

Ghost block would be on the client

then the client would tell the server to place at this spot

then just verify if thats valid

[past grove]

Oh, when I tried workspace:GetPartsInPart() didnt work

[simple crane]

?

[past grove]

I don't know how to perform WorldRoot operations such as GetPartsInPart() on the client side. I always thought that could only be done on the server side

[simple crane]

💀

there are some stuff that are only available through the server

isnt much tho

like Network ownership

only in server

[past grove]

Ohh

Perhaps that could be the cause

[simple crane]

and even some stuff thats only on clients

[past grove]

So, you can only detect parts that exist on the server side by settings those parts network ownership? I'm a little confused

Nevermind, my problem is accessing the WorldRoot on the client I believe

I'm an idiot. Was literally moving stuff on the wrong side...

[simple crane]

?

when the server makes changes it "replicates" to the client

now the client can see them

[past grove]

Ok but what if I create a part on the client, like my ghost part. It wont exist in WorldRoot and the position wont be updated so shouldn't it not work with things like GetPartsInBox?

[simple crane]

if the part isnt in workspace aka world root it cannot be detected by getparts in box thats true but also you cannot see the ghost part + the methods under workspace can be used everywhere

the client to server boundry doesnt affect it

like why do you need the server to know your doing this x thing like input stuff

[past grove]

Oh that sucks

[past grove]

The client side needs WorldRoot to offset parts. For example, if I put my mouse somewhere and the ghost part connected to my mouse intersects with a part it will move away from that part like a collision system

[simple crane]

what are you talking about blud 💀

[past grove]

Do you not understand?

[simple crane]

your not understanding things here

[past grove]

Yes, that's literally why I came here. I am asking if you do not understand what im trying to achieve

[simple crane]

what do you want to achieve? a ghost part that only shows onthe client?

[past grove]

Yes

[simple crane]

just clone the part on the client

[past grove]

With collisions

[simple crane]

?

[past grove]

I don't want the part to be able to intersect other parts

Even if the mouse is not over the part that is intersecting

I could just use the normal of the part my mouse is over and do that, but what if my mouse is not actually over the intersecting part?

[simple crane]

you mean you wanna make sure the part doest clip into other parts

[past grove]

I have to use GetPartsInBox() to determine that, which also means accessing WorldRoot which is my problem

[past grove]

Yeah

[simple crane]

world root is workspace

workspace is a global variable

or you can use game.Workspace

or game:GetService("Workspace")

[past grove]

Those all basically the same though correct?

I usually just use workspace

[simple crane]

yea

[past grove]

Ok so we have that

But now, I need to find intersecting parts (parts inside the ghost part)

Have you ever played Plane Crazy?

[simple crane]

yea

[past grove]

So you know how the collision system acts

Something like that

[simple crane]

local PartsInside = workspace:GetPartsInPart(Part)

[past grove]

Will that work for the ghost part which is technically not on the server side?

[simple crane]

what?

once again you dont need the server side for it to work

[past grove]

I'm puzzled

[past grove]

I'm going to test that real quick

[simple crane]

how 💀

[past grove]

I have 3 months experience in Studio, still learning

If that isnt already clear lol

@simple crane while wait(0.1) do for _, part in pairs(workspace:GetPartBoundsInBox()) do print(part.Name) end end

It's not printing anything whatsoever

wait..

I'm an actual dumbass LOL

Ok fixed it still not printing anything

[simple crane]

where part 🤨

[past grove]

I know that was what I forgot

[simple crane]

is the code even running?

[past grove]

Yes

[simple crane]

your using GetPartBoundsInBox not GetPartsInPart

you need a cframe and size for GetPartBoundsInBox to work

[past grove]

Oh my bad, ill try the other

Oh wait

I'll try the box one, should be better on performance

Hm, still no print. I'm moving a part inside of it and nothing happens

[simple crane]

is that in a localscript

[past grove]

Yes

[simple crane]

local scripts doesnt work in workspace

[past grove]

/:

wait

You mean the LocalScript cannot exist within the workspace?

[simple crane]

i mean local script wont run in workspace

[past grove]

And that brings me to my first problem

h o w

[simple crane]

?

[past grove]

Do I have to do the calculations for intersecting parts myself (I already made it)

[simple crane]

?

[past grove]

    local cframe = part.CFrame
    local halfSize = part.Size / 2

    local corners = {
        cframe:PointToWorldSpace(halfSize),
        cframe:PointToWorldSpace(-halfSize),
        cframe:PointToWorldSpace(Vector3.new(halfSize.X, halfSize.Y, -halfSize.Z)),
        cframe:PointToWorldSpace(Vector3.new(halfSize.X, -halfSize.Y, halfSize.Z)),
        cframe:PointToWorldSpace(Vector3.new(-halfSize.X, halfSize.Y, halfSize.Z)),
        cframe:PointToWorldSpace(Vector3.new(-halfSize.X, -halfSize.Y, -halfSize.Z)),
        cframe:PointToWorldSpace(Vector3.new(halfSize.X, -halfSize.Y, -halfSize.Z)),
        cframe:PointToWorldSpace(Vector3.new(-halfSize.X, halfSize.Y, halfSize.Z))
    }

    local min = Vector3.new(math.huge, math.huge, math.huge)
    local max = Vector3.new(-math.huge, -math.huge, -math.huge)

    for _, corner in pairs(corners) do
        min = Vector3.new(
            math.min(min.X, corner.X),
            math.min(min.Y, corner.Y),
            math.min(min.Z, corner.Z)
        )
        max = Vector3.new(
            math.max(max.X, corner.X),
            math.max(max.Y, corner.Y),
            math.max(max.Z, corner.Z)
        )
    end

    return Region3.new(min, max)
end

local function DoAABBIntersect(part1: Instance, part2: Instance)
    local AABB1, AABB2

    AABB1 = part1.AABB or CalculateAABB(part1)
    AABB2 = part2.AABB or CalculateAABB(part2)

    return not (
        AABB1.Max.X < AABB2.Min.X or AABB1.Min.X > AABB2.Max.X or 
        AABB1.Max.Y < AABB2.Min.Y or AABB1.Min.Y > AABB2.Max.Y or
        AABB1.Max.Z < AABB2.Min.Z or AABB1.Min.Z > AABB2.Max.Z
    )
end```

[simple crane]

workspace:GetPartBoundsInBox gets intesecting parts

[simple crane]

thats aabb

[past grove]

Yeah

All I need

[past grove]

Cant use that in a LocalScript

[simple crane]

you sure?

[past grove]

My game is going to consist of rectangular objects that can only be rotated in 90 degree increments so yes

I only need the AABB bounding box

[simple crane]

alr then it should work

[past grove]

I already thought of this, but imagine having to run it over potentially thousands of blocks

[simple crane]

Region3 is deprecated btw

[past grove]

It is?

[simple crane]

yea

[past grove]

Nothing says deprecated
https://create.roblox.com/docs/reference/engine/datatypes/Region3

[simple crane]

WorldRoot:FindPartsInRegion3() is deprecated

which is the "thing" for

[past grove]

I'm not using that

Region3 itself does not say deprecated

[simple crane]

what are you gonna use it for

[past grove]

Actually you have a point

I'm gonna stop using Region3

I have a new idea

[simple crane]

GetPartBoundsInBox works fine for me on the client

[past grove]

Could you show me? I thought you said and I even tested that workspace could not be accessed on a LocalScript

[simple crane]

while task.wait() do
    print(workspace:GetPartBoundsInBox(workspace.Part1.CFrame, workspace.Part1.Size))
end

[past grove]

I see why its working

It's because your parts already exist in the workspace

I'm trying to summon a new part on the client side only

[simple crane]

local Part = script:WaitForChild("Part1"):Clone()
Part.Anchored = true
Part.Parent = workspace
while task.wait() do
    print(workspace:GetPartBoundsInBox(Part.CFrame, Part.Size))
end

[past grove]

Interesting, still works if you move stuff around?

[simple crane]

yea

[past grove]

Huh! So you are moving it on the client or server side while its running?

[simple crane]

client ofc

[past grove]

Alright well, thanks for the help. I appreciate it and will try tomorrow. I have to head out soon so bye