Help showing GUI/Color when inside a non-cancollide block

Help and Feedback Scripting Support
1

I’m trying to show a semi-transparent GUI when inside a block,and make it invisible when outside. I’ve tried using Magnitude and also using Region3, but the magnitude is getting the center of the block and isn’t accurate.

Script I tried:

local rs = game:GetService("RunService")
local plr = game.Players.LocalPlayer
local char = plr.Character

rs.RenderStepped:Connect(function()
	if char then
		local posCompare1 = (char:WaitForChild("HumanoidRootPart").Position - workspace:WaitForChild("Storm"):WaitForChild("Side1").Position).Magnitude
		local posCompare2 = (char:WaitForChild("HumanoidRootPart").Position - workspace:WaitForChild("Storm"):WaitForChild("Side2").Position).Magnitude
		local posCompare3 = (char:WaitForChild("HumanoidRootPart").Position - workspace:WaitForChild("Storm"):WaitForChild("Side3").Position).Magnitude
		local posCompare4 = (char:WaitForChild("HumanoidRootPart").Position - workspace:WaitForChild("Storm"):WaitForChild("Side4").Position).Magnitude
		print(posCompare1)
		if posCompare1 <= 3 or posCompare2 <= 3 or posCompare3 <= 3 or posCompare4 <= 3 then
			script.Parent.Visible = true
		else
			script.Parent.Visible = false
		end
	end
end)

I’m not sure if there is an easier way to show a color while inside a block. If there is that’d be great.