How do I make my building system snap on part surfaces and on a grid, like the classic Stamper Tool?

Asked by

Y_VRN 246

4 years ago

|If possible please write easy answers for me to understand when it comes to CFrame math! I'm still figuring out how it works. Thanks in advance.|

My goal here is to make a building system where I could snap objects to surfaces of other objects while still following a grid (like the Stamper Tool or something else similar.)

Currently I've only managed to make grid snapping (I deleted that part of the code.) Surface snap only works when I remove the grid snapping functionality and all the workarounds I could think of don't work correctly (or I'm probably just tired when I work with them).

What else can I do to make this happen?:

01local PlayerCont = game:GetService("Players")
02local Mouse = PlayerCont.LocalPlayer:GetMouse()
03local PlacementCursor = Instance.new("Part", workspace) -- Since FilteringEnabled is true, we can
04-- make the player's cursor invisible to others.
05local SnapByStuds = 4
06 
07local States = { -- Non functional
08    OFF = 0,
09    BUILD = 1,
10    EDIT = 2,
11    COLOR = 3,
12    WIRE = 4,
13    CLIPBOARD = 5,
14    REMOVE = 6
15}
16 
17local RotationStates -- does nothing for now
18 
19-- Initialization
20 
21PlacementCursor.Transparency = 0.8 -- 0.8 for now
22PlacementCursor.Anchored = true
23PlacementCursor.CanCollide = false
24PlacementCursor.CastShadow = false
25PlacementCursor.Size = Vector3.new(4, 4, 4)
26PlacementCursor.Material = "Neon"
27 
28Mouse.TargetFilter = PlacementCursor
29 
30local cmath = {}
31 
32function cmath.even(x, returnNum, custCheck)
33    local custN = custCheck or 1
34    if returnNum then
35        return (x % custN)
36    end
37    return (x % custN) == 0
38end
39 
40function cmath.nearest(x, roundnum)
41    local rounding = roundnum or 1
42    if typeof(x) == "Vector3" then
43        local X, Y, Z = x.X, x.Y, x.Z
44        local rX, rY, rZ = cmath.even(X, true, rounding) / rounding, cmath.even(Y, true, rounding) / rounding, cmath.even(Z, true, rounding) / rounding
45 
46        if rX > 0.5 then
47            X = math.ceil(X / rounding) * rounding + (SnapByStuds/2)
48        else
49            X = math.floor(X / rounding) * rounding + (SnapByStuds/2)
50        end
51 
52        if rY > 0.5 then
53            Y = math.ceil(Y / rounding) * rounding + (SnapByStuds/2)
54        else
55            Y = math.floor(Y / rounding) * rounding + (SnapByStuds/2)
56        end
57 
58        if rZ > 0.5 then
59            Z = math.ceil(Z / rounding) * rounding + (SnapByStuds/2)
60        else
61            Z = math.floor(Z / rounding) * rounding + (SnapByStuds/2)
62        end
63 
64        return Vector3.new(X, Y, Z)
65    else
66        -- numbers only not used for now
67    end
68end
69 
70-- ===========================================================
71-- =========================================================== ACTUAL FUNCTIONS
72-- ===========================================================
73 
74function DisplayNewPosition() -- Something to improve on.
75    local Normal = Vector3.FromNormalId(Mouse.TargetSurface)
76    local Position = Mouse.Hit.p
77    local CursorCFrame = Mouse.Hit
78    local Anchor = Mouse.Target
79 
80    if CursorCFrame ~= nil and Anchor ~= nil then
81        local ObjectHit = Anchor.CFrame -- Anchor to center of object + rotation
82        local ObjectSpace = Anchor.CFrame:ToObjectSpace(CFrame.new(Position)) * CFrame.Angles(0, 0, 0)
83        local ObjectRotation = Anchor.CFrame - Anchor.CFrame.Position
84        local RotatedNormal = (ObjectRotation * Normal) * (PlacementCursor.Size / 2)
85        --print(RotatedNormal * PlacementCursor.Size)
86        local FinalFormulation = (ObjectHit * ObjectSpace) + RotatedNormal
87 
88        PlacementCursor.CFrame = FinalFormulation
89    end
90end
91 
92function RequestAddition()
93    -- nothing yet
94end
95 
96Mouse.Move:Connect(DisplayNewPosition)
 View all 96 lines...

Thanks (again) in advance!

How do I make my building system snap on part surfaces and on a grid, like the classic Stamper Tool?

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