How do i make blocks stack on each other?

So my friend gave me this kit he made but he never told me how to make it not snap to grid So i can make a second floor it say's it has a snap to grid setting but it does not work Is there anyway to make it go on top of a placed item if it is hover'd over or if your mouse is in the air it goes off the ground instead of it staying on ground Here is the code LONG CODE

001local function enablePlacement(plane, models, prealigned)
002    if (plane == currentPlane) then
003        return
004    elseif (currentPlane) then
005        currentPlane:disable()
006    end
007 
008    if (type(models) ~= "table") then
009        models = {models}
010    end
011 
012    lastRenderCycle = tick()
013 
014    currentPlane = plane
015    currentBase = plane.base
016 
017    local planePosition = currentBase.CFrame * Vector3.new(0, currentBase.Size.Y/2, 0)  
018 
019    resting = false
020    ox, oy, oz = planePosition.X, planePosition.Y, planePosition.Z
021    currentXAxis = currentBase.CFrame.rightVector
022    currentYAxis = currentBase.CFrame.upVector
023    currentZAxis = currentBase.CFrame.lookVector
024    currentAxis = CFrame.new(0, 0, 0, currentXAxis.X, currentYAxis.X, -currentZAxis.X, currentXAxis.Y, currentYAxis.Y, -currentZAxis.Y, currentXAxis.Z, currentYAxis.Z, -currentZAxis.Z)
025    currentObjects = {}
026    dxx, dxy, dxz = currentXAxis.X, currentXAxis.Y, currentXAxis.Z
027    dzx, dzy, dzz = currentZAxis.X, currentZAxis.Y, currentZAxis.Z
028    cx, cy, cz, cr = 0, 0, 0, 0
029 
030    springVelocity = Vector3.new(0, 0, 0)
031    springPosition = Vector3.new(0, 0, 0)
032 
033    tweenAlpha = 0
034    tweenCurrentRotation = 0
035    tweenGoalRotation = 0
036    tweenStartRotation = 0
037 
038    local position, _ = inputCapture()
039 
040    if (not position) then
041        position = planePosition
042    end
043 
044    springPosition = position
045 
046    do
047        local extentsXMin, extentsXMax = 10e10, -10e10
048        local extentsZMin, extentsZMax = 10e10, -10e10
049 
050        for i = 1, #models do
051            local model = models[i]
052            local object = {}
053            object.model = model
054 
055            local lookVector = object.model.PrimaryPart.CFrame.lookVector   
056            local theta
057            local px, pz
058 
059            if (prealigned) then
060                local position = object.model.PrimaryPart.CFrame * Vector3.new(0, -object.model.PrimaryPart.Size.Y/2 , 0)       
061                px, pz = project(position.X, position.Y, position.Z)
062 
063                theta = math.acos(math.clamp(lookVector:Dot(currentZAxis), -1, 1))
064                local cross = lookVector:Cross(currentZAxis)
065 
066                if (cross:Dot(currentYAxis) > 0) then
067                    theta = -theta
068                end
069 
070            else
071                px, pz = object.model.PrimaryPart.Position.X, object.model.PrimaryPart.Position.Z
072                theta = math.atan2(lookVector.X, lookVector.Z)      
073            end
074 
075            local x, z = model.PrimaryPart.Size.X, model.PrimaryPart.Size.Z
076 
077            object.r = round((theta % (2 * math.pi))/(math.pi/2), 1)
078 
079            if (object.r == 1 or object.r == 3) then
080                x, z = z, x
081            end
082 
083            local x1, x2 = px + x/2, px - x/2
084            local z1, z2 = pz + z/2, pz - z/2  
085 
086            if (x2 < extentsXMin) then
087                extentsXMin = x2
088            end
089            if (x1 > extentsXMax) then
090                extentsXMax = x1
091            end
092 
093            if (z2 < extentsZMin) then
094                extentsZMin = z2
095            end
096            if (z1 > extentsZMax) then
097                extentsZMax = z1
098            end
099 
100 
101            model.PrimaryPart.Transparency = .5
102            model.PrimaryPart.Anchored = true
103            model.PrimaryPart.CanCollide = false
104 
105            setState(object, plane.loading and states.loading or states.neutral)
106 
107            currentObjects[i] = object
108        end
109 
110        currentExtentsX, currentExtentsZ = round(extentsXMax - extentsXMin, currentPlane.grid), round(extentsZMax - extentsZMin, currentPlane.grid)
111 
112        for i = 1, #currentObjects do
113            local object = currentObjects[i]
114            local px, pz
115 
116            if (prealigned) then
117                local position = object.model.PrimaryPart.CFrame * Vector3.new(0, -object.model.PrimaryPart.Size.Y/2, 0)        
118                px, pz = project(position.X, position.Y, position.Z)
119            else
120                px, pz = object.model.PrimaryPart.Position.X, object.model.PrimaryPart.Position.Z
121            end
122 
123            object.px = px - (extentsXMin + extentsXMax)/2
124            object.pz = (pz - (extentsZMin + extentsZMax)/2) * (prealigned and -1 or 1)
125 
126            object.sx, object.sy, object.sz = object.model.PrimaryPart.Size.X, object.model.PrimaryPart.Size.Y, object.model.PrimaryPart.Size.Z
127        end
128    end
129 
130    renderConnection = runService.RenderStepped:connect(run)
131    module.currentPlane = currentPlane
132    currentEvent = Instance.new("BindableEvent")
133 
134    if (GRID_TEXTURE) then
135        currentTexture = Instance.new("Texture", currentPlane.base)
136        currentTexture.Texture = GRID_TEXTURE
137        currentTexture.Face = Enum.NormalId.Top
138        currentTexture.StudsPerTileU = currentPlane.grid
139        currentTexture.StudsPerTileV = currentPlane.grid
140    end
141 
142    bindInputs()
143 
144    run(true)
145 
146    return currentEvent.Event
147end
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I dont get what game you're trying to make lol iuclds 720 — 5y

Ok so the placement is already there and places stuff but it only places on the ground i want it to go in the air kinda like bloxburg how you can make second floor. Corrupt_Wolfstrik3r 51 — 5y

How do i make blocks stack on each other?

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