Calculating the Y offset for a placement system

Help and Feedback Scripting Support
, , ,
#1

Hello! I started to work on a placement system(Some code is not mine) and I was facing issue with how to calculate the Y offset.

This is what I have so far

local function Round(Number)
		return math.floor((Number / ROUND_TO) + 0.5) * ROUND_TO
end

Mouse.Move:Connect(function()
		local TargetPosition = Mouse.Hit.p
		local RoundedTargetCFrame = CFrame.new(Round(TargetPosition.X), Round(TargetPosition.Y), Round(TargetPosition.Z))
		game:GetService("TweenService"):Create(Item,TweenInfo.new(.15, Enum.EasingStyle.Linear, Enum.EasingDirection.Out),{CFrame = RoundedTargetCFrame}):Play()
end)

If anyone could help me out that would be great! :grinning_face_with_smiling_eyes:

1 Like
#2

Don’t round the Y axis to the grid scale. Move the model up by half it’s BoundingSize.Y. the 2nd value returned from GetBoundingBox is the bounding size.

#3

I attempted this and these were my results:
EDIT: I want it to go on top of any part it detects if you know what I mean

local function Round(Number)
		return math.floor((Number / ROUND_TO) + 0.5) * ROUND_TO
end

Mouse.Move:Connect(function()
	local TargetPosition = Mouse.Hit.p
	local orientation, size = Item:GetBoundingBox()
	local RoundedTargetCFrame = CFrame.new(Round(TargetPosition.X),size.Y/2, Round(TargetPosition.Z))
		game:GetService("TweenService"):Create(Item.PrimaryPart,TweenInfo.new(.15, Enum.EasingStyle.Linear, Enum.EasingDirection.Out),{CFrame = RoundedTargetCFrame}):Play()
end)

#4

heres a simple script for ya

local RS = game:GetService("RunService")

local Player = game:GetService("Players").LocalPlayer
local Mouse = Player:GetMouse()

local Part = Instance.new("Part")
Part.BrickColor = BrickColor.Random()
Part.Anchored = true
Part.Parent = workspace

Mouse.TargetFilter = Part
RS.RenderStepped:Connect(function()
	Part.CFrame = CFrame.new(Mouse.Hit.Position + Part.Size/2) 
	
end)

make sure you get the position you want it to towards then add the size of the object and divide by 2

#5

thanks for the help! im going to create my own script:D

1 Like
#6

The moving it up by half size bit needs to be an offset from the original Y value, not overwriting it.

local RoundedTargetCFrame = CFrame.new(Round(TargetPosition.X), TargetPosition.Y, Round(TargetPosition.Z)) * CFrame.new(0, size.Y / 2, 0)
1 Like
#7

I did come to realize is this bug happens:
I think its because of the mouse position
(I dont have much experience with these systems lol)

#8

its because the offset is being applied on all axis, moving you to the corner of the part each time.

you still need to apply the Y axis size half as an offset transform.

Part.CFrame = CFrame.new(Mouse.Hit.Position) * CFrame.new(0, Part.Size / 2, 0)
1 Like
#9

I had a feeling something would go wrong here, I rewrote it and used raycasting so I could get the normal of the part your mouse is pointing at, here ya go

now it will calculate the proper plane of every face

local RS = game:GetService("RunService")

local Player = game:GetService("Players").LocalPlayer
local Mouse = Player:GetMouse()

local Model = Instance.new("Model")
local Part = Instance.new("Part")
Part.BrickColor = BrickColor.Random()
Part.Anchored = true
Model.PrimaryPart = Part
Part.Parent = Model
Model.Parent = workspace

local IgnoreList = {Model, Player.Character}

local RayParams = RaycastParams.new()
RayParams.FilterDescendantsInstances = IgnoreList
RayParams.FilterType = Enum.RaycastFilterType.Blacklist

local MaxPlaceDistance = 2000


function RayCast()
	
	local MRay = Mouse.UnitRay

	local RayResult = workspace:Raycast(MRay.Origin, MRay.Direction.unit * MaxPlaceDistance, RayParams)
	
	if RayResult then
		local EndPos = RayResult.Position + (RayResult.Normal * (Model.PrimaryPart.Size*.5))
		Model:SetPrimaryPartCFrame(CFrame.new(EndPos))	
		
	end
	
	
end

game:GetService("RunService").RenderStepped:connect(function()
	RayCast()
end)
#10

oh you are totally right, whoops!

#11

thanks again both of you for the help!

1 Like
#12

Glad we could help, if you have any questions make sure to ask!

1 Like
#13

Hey actually I do have a question, if I wanted to insert a grid how could I pull this off?
EDIT: I don’t mean actually inserting a grid just getting it to move like it.

#14

Worked out my own grid system:D