How would I scale a part based on it surroundings?

[baseparts]

I’d like to have a part scale based on its surroundings. How would I achieve this? I’m guessing this has to do with raycasting and some math.

Example:

[Askavix]

Two crude solutions would be:

1. raycast from each side of the box (you can get the starting directions by using the part’s CFrame.rightVector,lookVector), then the distance of the raycast will give you 1/2 the size.

2. Keep making box bigger until it intersects then shrink it till it no longer intersects, you can check with the isColliding function or whatever it is called

[baseparts]

sorry for the late response.
I ended up firing a raycast on each side, and calculating the center and positioning it correctly. Here’s my code:

local part = script.Parent

local hitPositions = {}
local origin = part.Position

local directions = {
	Vector3.new(-10,0,0);
	Vector3.new(10,0,0);
	Vector3.new(0,0,10);
	Vector3.new(0,0,-10);
}

for i,direction in ipairs(directions) do
	local result = workspace:Raycast(origin, direction)
	local hitPosition = (result and result.Position) or origin + direction
	if i == 1 or i == 2 then
		table.insert(hitPositions,hitPosition.X)
	else
		table.insert(hitPositions,hitPosition.Z)
	end
end

local sizeX = (hitPositions[2] - hitPositions[1])
local sizeZ = (hitPositions[3] - hitPositions[4])

local posX = (hitPositions[2] + hitPositions[1])/2
local posZ = (hitPositions[3] + hitPositions[4])/2


part.Size = Vector3.new(sizeX,0,sizeZ)
part.Position = Vector3.new(posX,0,posZ)