Any way to figure out how to round a parts position to a whole number?

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#1

Hello! I need help with aligning blocks to the grid.

  1. What do you want to achieve? I want to make it so my building system aligns to the grid.

  2. What is the issue? I cannot figure out how to round the parts position to a whole number, making it align to the grid.

  3. What solutions have you tried so far? I have looked all over the Devforum.

If you can help, it will be greatly appreciated!

#2

Use math.abs(your number).

Always check developer.roblox.com since this has most of the answers you need.

#3

It is a Vector3, so math.abs() cannot do it. Also, I checked and it wouldn’t round a normal number, so this is all not working.

#4

making something align to a grid can be done like so:

local GridSize = 2 --The space between spots on the grid, so objects should be 2 studs apart.
function AlignVector3(Position) --Takes in any vector3
   Position.X = math.floor(Position.X/GridSize)*GridSize --If Position.X == 3, then 3/2 = 1.5, and 1.5 floored (rounded down) = 1, then we multiply it by the gridsize to space it out.
   Position.Y = math.floor(Position.Y/GridSize)*GridSize -- if it was 5, 5/2 = 2.5, rounded down to 2, 2*2 = 4
   Position.Z = math.floor(Position.Z/GridSize)*GridSize --If it was 1, 1/2 = 0.5, rounded down to 0, 0*2 = 0.
   return Position --Would have gone from Vector3(3, 5, 1) to Vector3(2, 4, 0) [xyz]
end
--//For example
print(AlignVector3(11, 5, 3)

console

10, 4, 2

If you want I can do a further walkthrough of why this works, and if you have any questions just ask.

#5 
local vec3 = Vector3.new(2.4, 2.1, 2.3)
local newvec3 : Vector3 = {math.abs(vec3.x), math.abs(vec3.y), math.abs(vec3.z)}

Even without Luau typehinting Lua will do an implicit conversion from that table to a Vector3.

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#6

math.abs turns negatives into positives, getting the absolute distance from 0.
That doesn’t have anything to do with rounding or grid allignment???

#7

lol, sorry to both you and @TheCursedSpud, I meant math.round.
math.floor would reduce 3.99 to 3, so math.round would work better.
brain no worky.
But like others have said, a Vector3 can have each value rounded inside the Vector3.

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