Problem in a simple placement system

Help and Feedback Scripting Support
#1

Hi Guys, so I was currently tweaking a placement system, but it’s an error and it’s not working well. Basically I set the Y value to 0.5, but for some reason, it’s -9.5 when testing.

local part = Instance.new("Part", workspace)
local mouse = game.Players.LocalPlayer:GetMouse()
local RS = game:GetService("RunService")
local gridSize = 4
mouse.TargetFilter = part

function snapToGrid()
	local x = math.floor(mouse.Hit.X/gridSize + 0.5) * gridSize
	local y = 0.5
	local z = math.floor(mouse.Hit.Z/gridSize + 0.5) * gridSize
	return CFrame.new(x,y,z)
end

function convertToObjectSpace()
	local base = workspace.Baseplate.CFrame
	local objspace = snapToGrid():ToObjectSpace(base)
	return CFrame.new(math.clamp(objspace.X, -workspace.Baseplate.Size.X/2, workspace.Baseplate.Size.X/2, 0.5, math.clamp(objspace.Z, -workspace.Baseplate.Size.Z/2, workspace.Baseplate.Size.Z/2))
end

RS.RenderStepped:Connect(function()
	part.CFrame = workspace.Baseplate.CFrame * convertToObjectSpace()
end)

Is there any problem with the math I did, or anything else. Thanks!

#2

The multiply function for CFrames adds to the current CFrame so you are adding 0.5 to what the CFrame currently was. Instead, you should set the CFrame to that value.

#3

Actually, the official documentation said that doing this converts ObjectSpace to World Space. I’ll correct everything and let you know.

#4

I have used these before and using multiplication is an additive in ObjectSpace

#5

I changed the code and made this -

local part = Instance.new("Part", workspace)
local mouse = game.Players.LocalPlayer:GetMouse()
local RS = game:GetService("RunService")
local gridSize = 4
mouse.TargetFilter = part

function snapToGrid()
	local x = math.floor(mouse.Hit.X/gridSize + 0.5) * gridSize
	local y = 0.5
	local z = math.floor(mouse.Hit.Z/gridSize + 0.5) * gridSize
	return CFrame.new(x,y,z)
end

function convertToObjectSpace()
	local base = workspace.Baseplate.CFrame
	local objspace = snapToGrid():ToObjectSpace(base)
	return Vector3.new(math.clamp(objspace.X, -workspace.Baseplate.Size.X/2, workspace.Baseplate.Size.X/2, 0.5, math.clamp(objspace.Z, -workspace.Baseplate.Size.Z/2, workspace.Baseplate.Size.Z/2)))
end

RS.RenderStepped:Connect(function()
	part.Position = convertToObjectSpace()
end)

But instead of going to mouse position, it goes to opposite direction. I just want to know how to convert it back to World Space.

#6

With your original version try multiplying the CFrame also by CFrame.new(0, part.Position.Y * -1, 0)

It should remove the excess height

#7

I revamped the whole script and fixed the problem -

local part = Instance.new("Part", workspace)
part.Anchored = true
local mouse = game.Players.LocalPlayer:GetMouse()
local RS = game:GetService("RunService")
local gridSize = 4
mouse.TargetFilter = part

function snapToGrid()
	local x = math.floor(mouse.Hit.X/gridSize + 0.5) * gridSize
	local y = 0.5
	local z = math.floor(mouse.Hit.Z/gridSize + 0.5) * gridSize
	return CFrame.new(x,y,z)
end

function convertToObjectSpace()
	local base = workspace.Baseplate.CFrame
	local objspace = base:ToObjectSpace(snapToGrid())
	return Vector3.new(math.clamp(objspace.Position.X, -workspace.Baseplate.Size.X/2, workspace.Baseplate.Size.X/2), 0.5, math.clamp(objspace.Position.Z, -workspace.Baseplate.Size.Z/2, workspace.Baseplate.Size.Z/2))
end
mouse.Move:Connect(function()
	local cframe = workspace.Baseplate.CFrame:ToWorldSpace(CFrame.new(convertToObjectSpace()))
	part.CFrame = cframe + Vector3.new(0, 10.5, 0)
end)

Thanks for helping :slight_smile:

#8

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