How to round all CFrame values?

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#1

In my games, the user can rotate objects only in 90-degree steps.
I use Tween to rotate the objects.
Tween almost always returns non-round values, due to the inaccuracy of float operations.
Therefore, a 90-degree rotation on the Y axis should return a clean Cframe like:

55 5 -20 -1 0 0 0 1 0 0 0 -1

But instead I get:

55 5 -20 -1 0 -1.5099580252809e-07 0 1 0 1.5099580252809e-07 0 -1

How to round all these CFrame values in a single step?

2 Likes
#2

There’s not much you can do about floating point rounding errors, because it’s handled internally.
However, in Lua, integers can be represented in doubles accurately up to 2^53, so why not store the value(s) as an integer?

2 Likes
#3

You can use math.floor to round down the values

#4

How to reconstruct all CFrame values (x, y, z, R00, R01, R02, R10, R11, R12, R20, R21, R22)?

#5

What do you mean? Get all of them?

#6

I gave it a shot:

local cframeTable = table.pack(cframeValueHere:GetComponents())
for i, v in pairs(cframeTable) do
    cframeTable[i] = math.round(v)
end
local roundedCFrame = CFrame.new(table.unpack(cframeTable))
10 Likes
#7

Perfect!
You should patent this solution… :sweat_smile:

#8

Hello, is there a way to prevent this script from rounding one of the values ​​of a Cframe? Example, if it is coordinates, do not round the Y but round the others. Thanks!

#9

Just use GetComponents to get all the components of the matrice, and round the ones you want.