How do you make something go in the middle of the square instead of in the corner?

Help and Feedback Scripting Support
#1

Hello!

I’m working on something that allows people to make custom shops, however I’ve run into an issue where when attempting to place something, the item goes into the corner of 4 squares instead of the centre. I’m terrible with math so how would I go about making it centred instead of in the corner?

image

Currently, I have this which snaps the object to the grid:

function module.ClampVector(self, vector: Vector3) -- basically clamps the mouse's hit position to the plot's size
	return Vector3.new(
		math.clamp(vector.X, -self.PlacementPlane.Size.X / 2, self.PlacementPlane.Size.X / 2),
		vector.Y,
		math.clamp(vector.Z, -self.PlacementPlane.Size.X / 2, self.PlacementPlane.Size.X / 2)
	)
end

function module.SnapToGrid(self, vector: Vector3)
	local gridSnap = self.GridSnap -- a number (5 in my case)
	local modX, modZ = vector.X % gridSnap, vector.Z % gridSnap -- I'm thinking this is how I'd go about applying a 2.5 stud offset but idk what to do with this number
	vector = self:ClampVector(vector)
	return Vector3.new(
		math.round(vector.X / gridSnap) * gridSnap,
		math.round(vector.Y / gridSnap) * gridSnap,
		math.round(vector.Z / gridSnap) * gridSnap
	)
end

Any ideas as to how I’d approach this?

#2

You can probably add X amount of studs to the returned Vector3

return Vector3.new(
	math.round(vector.X / gridSnap) * gridSnap + 2, -- I added +2 to these 3
	math.round(vector.Y / gridSnap) * gridSnap + 2, -- You can change it
	math.round(vector.Z / gridSnap) * gridSnap + 2 -- to match what you need
)
#3

While that technically works, it only advances it 2.5 studs which causes the part to advance to the next square even if the mouse isn’t inside of that square.

https://gyazo.com/ba1523fc6f020625f238efddd22831cc

#4

Like I said you can change the + 2. Try - 2.5

#5

I know, I changed it to be half the grid size (2.5), but that still gives an undesired result.

Changing it to -2.5 would also cause the same thing to happen but inverse (back 2.5 studs instead of advance 2.5 studs)

#7

Revert my changes and try to add the 2.5 in the Clamp instead

function module.ClampVector(self, vector: Vector3) -- basically clamps the mouse's hit position to the plot's size
	return Vector3.new(
		math.clamp(vector.X, -self.PlacementPlane.Size.X / 2, self.PlacementPlane.Size.X / 2) + 2.5,
		vector.Y + 2.5,
		math.clamp(vector.Z, -self.PlacementPlane.Size.X / 2, self.PlacementPlane.Size.X / 2) + 2.5
	)
end

Edit: actually i think it will have the same effect

#8

It does, it has something to do with the rounding thing.

#9

Hmm. Try this,

function module.ClampVector(self, vector: Vector3) -- basically clamps the mouse's hit position to the plot's size
	return Vector3.new(
		math.clamp(vector.X - 2.5, -self.PlacementPlane.Size.X / 2, self.PlacementPlane.Size.X / 2),
		vector.Y - 2.5,
		math.clamp(vector.Z - 2.5, -self.PlacementPlane.Size.X / 2, self.PlacementPlane.Size.X / 2)
	)
end
...
return Vector3.new(
	math.round(vector.X / gridSnap) * gridSnap + 2.5,
	math.round(vector.Y / gridSnap) * gridSnap + 2.5,
	math.round(vector.Z / gridSnap) * gridSnap + 2.5
)

What im thinking with this is, if you offset the “cursor” position, it will affect the clamping. Then you will add the vectors to center it.

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