Scale Multiple Parts Together

Help and Feedback Scripting Support
#1

My group has 3 parts:

  • Apple (Part)
    in Apple is 2 more parts

I am trying to find a way to scale the 2 inside parts and still keep the position. When I change the size of both, the positioning of those 2 inner parts gets messed up

Screen Shot 2022-10-13 at 4.06.52 PM
Screen Shot 2022-10-13 at 4.07.18 PM

Clarification
Using the Roblox Studio scale tool works. I am trying to do this in a script

Accessory doesn't scale
#2

I think if you hold shift while changing the size, it should work fine.

1 Like
#3

There are Plugins that help scale. I think one of them is called ScaleLite or soemthing

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#4

Using the Roblox Studio scale tool works. I am trying to do this in a script cc @incognitobot_rblx

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#5

This will help

#6

I tried that and for some reason does not work, positioning is still messed up

1 Like
#7

If you want the part to stick at the top, for example, you would have to move it up by half the change in size in the y axis:

part.Size = Vector3.new(1,1,1)
part.Size = Vector3.new(1,3,1) -- change in size in the y axis = 2
part.Position += Vector3.new(0,1,0) -- half of that

This makes the example part 2 studs bigger in the y axis and moves it up 1 stud, keeping it on the surface of whatever it was on.

It works when sizing down too, except you move it down instead of up

#8

Screen Shot 2022-10-13 at 4.27.36 PM
Screen Shot 2022-10-13 at 4.27.36 PM1506×574 95.5 KB

These all have the same format, (2 parts, 1 is above the other) but for some of them it doesn’t position properly

#9

It probably has something to do with the rotation of the parts. Try to see which axis is “up” and move it using:

part.Position = part.CFrame:PointToWorldSpace(move it using the correct axis)
#10

None of the parts have any rotation

#11

Then sorry, but I dont know how to help, if all parts have exactly no rotation, it should work fine.

Edit: Maybe if you could show what it looks like after it runs (and the code too) i could try to come up with a solution

#12

Screen Shot 2022-10-13 at 4.42.29 PM

#13

It looks like they are being moved up too much.
Remember that, the amount it is moved by is half the change in size in the y axis:

local change = newY-prevY
part.Position += Vector3.new(0,change/2,0)

If this is not it, then I cant do anything else without looking at the script.

#14

This is the code I used, “default” is the stem part

local function scaleFruit(fruit, scale)
	local default = fruit:FindFirstChild("default")
	local base = fruit:FindFirstChild("base")
	if not base or not default then return end
	
	local previousSize = default.Size
	local newSize
	
	default.Size = default.Size * scale
	base.Size = base.Size * scale
	newSize = default.Size
	
	default.Position += Vector3.new(0, (newSize.Y - previousSize.Y) / 2, 0)
end
#15

Youre scaling the base too, so you need to move it down, or add half the change in size to the base:

default.Position += Vector3.new(0, (newSize.Y - previousSize.Y) / 2, 0)
base.Position -= Vector3.new(0,(newBaseSize.Y - prevBaseSize.Y)/2,0)

or

default.Position += Vector3.new(0, (newSize.Y - previousSize.Y + newBaseSize.Y - prevBaseSize.Y) / 2, 0)
#16

Screen Shot 2022-10-13 at 5.18.42 PM
Screen Shot 2022-10-13 at 5.18.42 PM868×509 487 KB

default.Position += Vector3.new(0, newSize.Y - previousSize.Y + newBaseSize.Y - prevBaseSize.Y, 0)

#17

Sorry, i believe something else is causing the issue, I tested the function myself and it worked flawlessly:
Original:
image
Scaled up:
image

#18

can you show me the hiercahy in explorer

#19

Sure thing.
image

#20

So the difference here is that the parent is a part, not a model and the base and default parts have weldconstraints to the parent part