Grid Building System Problem

Help and Feedback Scripting Support
6

Took a bit but I finally found a solution

I combined what I had with the solution of this post Block Placement System Help (Positioning the blocks relative to other parts?) - #8 by Intended_Pun

and it works perfectly

Code, It’s not the neatest so sorry about that

local Player = game.Players.LocalPlayer

local Build_Storage = game:GetService("ReplicatedStorage"):WaitForChild("Buildables")
local Concrete_Block = Build_Storage:WaitForChild("Concrete")

local Placed_Blocks = game.Workspace:WaitForChild("Placed_Blocks")
local Ignore_Blocks = game.Workspace:WaitForChild("Ignore_Blocks")
local Base = game.Workspace:WaitForChild("Base")

local Mouse = Player:GetMouse()
Mouse.TargetFilter = Ignore_Blocks

local target = nil
local pos = nil
local norm = nil

local MAX_PLACEMENT_DISTANCE = 2000

function doFakeMouseStuff()
	local ignoreList = {Ignore_Blocks}	--game.Workspace:WaitForChild("BaseStore"):GetChildren()
	local mouseRay = Mouse.UnitRay
	local newRay = Ray.new(mouseRay.Origin, mouseRay.Direction.unit * MAX_PLACEMENT_DISTANCE)
	target, pos, norm = workspace:FindPartOnRayWithIgnoreList(newRay, ignoreList)
end

game:GetService("RunService").RenderStepped:connect(function()
	doFakeMouseStuff()
end)

function round(vec, block)
	local posx = math.floor(vec.X / block.PrimaryPart.Size.X + 0.5) * block.PrimaryPart.Size.X 
	local posy = math.floor(vec.Y / block.PrimaryPart.Size.Y + 0.5) * block.PrimaryPart.Size.Y
	local posz = math.floor(vec.Z / block.PrimaryPart.Size.Z + 0.5) * block.PrimaryPart.Size.Z
	
	return Vector3.new(posx, posy, posz)
end
local item = Concrete_Block:Clone()
item.Parent = Ignore_Blocks
Mouse.Move:connect(function()
	if item and pos and norm then
		doFakeMouseStuff()	-- Just to be cetain that the data is up to date.
		local endPos = round(pos + (norm * (item.PrimaryPart.Size*.5)), item)
		item:SetPrimaryPartCFrame(CFrame.new(endPos))
	end
end)

Mouse.Button1Down:connect(function()
	local part = item:Clone()
	part:SetPrimaryPartCFrame(CFrame.new(item.PrimaryPart.Position))
	part.Name = 'block'
	part.Parent = workspace
	
end)
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