Snap to grid even if out of boundary

[bg9]

My code isn’t the same as @DataSigh

[DataSigh]

try this:

--you will need to know the grid size in worldspace position
local plot = workspace.plot
local plotSize = plot.Size

local gridsizeX = {
    plot.Position.X - plotSize.X / 2,
    plot.Position.X + plotSize.X / 2
}

local gridsizeZ = {
    plot.Position.Z - plotSize.Z / 2,
    plot.Position.Z + plotSize.Z / 2
}

RunService.Heartbeat:Connect(function(dt)
	if mouse.Target ==  nil then return end
	
	if mouse.Target.Parent.Parent.Name == "gridParts" then -- checks if its a grid part
		local pos = mouse.Hit
		
		TweenService:Create(selectionpart.PrimaryPart,TweenInfo.new(0.4,Enum.EasingStyle.Quad),
		{CFrame = pos * CFrame.Angles(0, math.rad(rotation), 0)}
		):Play()
	else
		--SECOND PART
		local pos = mouse.Hit

		--clamp the X/Z positions here and add the angle directly
		local cframeClampedPosition = CFrame.new(
			math.clamp(pos.X, gridsizeX[1], gridsizeX[2]),
			plot.Position.Y + selectionpart.PrimaryPart.Size.Y / 2,
			math.clamp(pos.Z, gridsizeZ[1], gridsizeZ[2])
		) * CFrame.Angles(0, math.rad(rotation), 0)

		TweenService:Create(selectionpart.PrimaryPart,TweenInfo.new(0.4,Enum.EasingStyle.Quad),
		{CFrame = cframeClampedPosition}
		):Play()
	end
end)

[DataSigh]

Check if your rojo is connected

[VilHasPlenty]

Okay, yeah with mouse.Hit it works

Its working properly but, if the cursor is pointing to the sky it doesn’t detect it

[bg9]

@VilHasPlenty

Its working properly but, if the cursor is pointing to the sky it doesn’t detect it

try this:

--you will need to know the grid size in worldspace position
local plot = workspace.plot
local plotSize = plot.Size

local gridsizeX = {
    plot.Position.X - plotSize.X / 2,
    plot.Position.X + plotSize.X / 2
}

local gridsizeZ = {
    plot.Position.Z - plotSize.Z / 2,
    plot.Position.Z + plotSize.Z / 2
}

RunService.Heartbeat:Connect(function(dt)
	if mouse.Target and mouse.Target.Parent.Parent.Name == "gridParts" then -- checks if its a grid part
		local pos = mouse.Hit
		
		TweenService:Create(selectionpart.PrimaryPart,TweenInfo.new(0.4,Enum.EasingStyle.Quad),
		{CFrame = pos * CFrame.Angles(0, math.rad(rotation), 0)}
		):Play()
	else
		--SECOND PART
		local pos = mouse.Hit

		--clamp the X/Z positions here and add the angle directly
		local cframeClampedPosition = CFrame.new(
			math.clamp(pos.X, gridsizeX[1], gridsizeX[2]),
			plot.Position.Y + selectionpart.PrimaryPart.Size.Y / 2,
			math.clamp(pos.Z, gridsizeZ[1], gridsizeZ[2])
		) * CFrame.Angles(0, math.rad(rotation), 0)

		TweenService:Create(selectionpart.PrimaryPart,TweenInfo.new(0.4,Enum.EasingStyle.Quad),
		{CFrame = cframeClampedPosition}
		):Play()
	end
end)

[VilHasPlenty]

Yeah that works good except the height when its out of bounds

Here is the updated code

RunService.Heartbeat:Connect(function(dt)
	if mouse.Target and mouse.Target.Parent.Parent.Name == "gridParts" then -- checks if its a grid part
		local pos = mouse.Target.CFrame

		TweenService:Create(selectionpart.PrimaryPart,TweenInfo.new(0.4,Enum.EasingStyle.Quad),
			{CFrame = pos * CFrame.Angles(0, math.rad(rotation), 0)}
		):Play()
	else
		--SECOND PART
		local pos = mouse.Hit

		--clamp the X/Z positions here and add the angle directly
		local cframeClampedPosition = CFrame.new(
			math.clamp(pos.X, gridsizeX[1], gridsizeX[2]),
			plot.Position.Y + selectionpart.PrimaryPart.Size.Y / 2, -- # object is a bit lower than usual for some reason
			math.clamp(pos.Z, gridsizeZ[1], gridsizeZ[2])
		) * CFrame.Angles(0, math.rad(rotation), 0)

		TweenService:Create(selectionpart.PrimaryPart,TweenInfo.new(0.4,Enum.EasingStyle.Quad),
			{CFrame = cframeClampedPosition}
		):Play()
	end
end)

I tried setting the Y just to plot.Position.Y but same result

plot.Position.Y + selectionpart.PrimaryPart.Size.Y / 2, -- # object is a bit lower than usual for some reason

[bg9]

What about plot.Position.Y + plot.Size.Y / 2 + selectionpart.PrimaryPart.Size.Y / 2

[VilHasPlenty]

Thank you! That works

Do you know what the logic will be behind making the object not go off grid?

[bg9]

local halfSizeX = selectionpart.PrimaryPart.Size.X / 2
local halfSizeZ = selectionpart.PrimaryPart.Size.Z / 2

local cframeClampedPosition = CFrame.new(
	math.clamp(pos.X, gridsizeX[1] + halfSizeX, gridsizeX[2] - halfSizeX),
	plot.Position.Y + plot.Size.Y / 2 + selectionpart.PrimaryPart.Size.Y / 2,
	math.clamp(pos.Z, gridsizeZ[1] + halfSizeZ, gridsizeZ[2] - halfSizeZ)
) * CFrame.Angles(0, math.rad(rotation), 0)

[VilHasPlenty]

That works great vertically but not horizontally

[DataSigh]

When you’re figuring out the bounds, add the selection parts size as a variable so it clamps from the edge of the selection part instead of the center

[VilHasPlenty]

And that edge will be the back or front of the model?

[DataSigh]

yes, depending on where it’s being clamped, you add the size length of the model

[VilHasPlenty]

Yes, but even when changing the size it doesnt account for 2 grids, am I doing something wrong?

(I can’t place to the right)

local halfSizeX
local halfSizeZ
if rotation == 0 or 180 then
	halfSizeX = selectionpart.PrimaryPart.Size.X / 2
	halfSizeZ = selectionpart.PrimaryPart.Size.Z / 2
elseif rotation == 90 or 270 then
	halfSizeX = selectionpart.PrimaryPart.Size.X
	halfSizeZ = selectionpart.PrimaryPart.Size.Z			
end