New Attribute Issue(Can't find the 'Roblox Engine Bug' section I'll put it here)

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#1

As I was updating my custom camera and movement scripts and I noticed that when I was printing the direction attribute it seemed to print a random decimal number but when I went into debug mode and checked the real value it was something else.

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The local variable ‘a’ is there so the debugger doesn’t go out of scope and free the memory of direction before I can see it.

The direction is being added to unit vectors only so it should be showing a unit vector but as you can see when outputting the attribute in anyway it shows a random decimal number.

#2

just looks like a rounding error to me.

2.64 * 10^-23 (2.64e-23) is basically 0. For reference that is 0.00000000000000000000000264797796

#3

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#4

that would make sense then but it just makes outputting it awkward when im trying to get the acceleration and air acceleration right

#5

Just round it to when outputting it.

local Rounded = Vector3.new(
    math.floor(Direction.X * 100) / 100,
    math.floor(Direction.Y * 100) / 100,
    math.floor(Direction.Z * 100) / 100
)

print(Rounded)

This works by shifting the number over by 2 decimal places (0.125 would become 12.5 and then when floored would become 12, then divides it by 100 to put it to 0.12; this is basically just creating a fixed decimal precision)

#6

yea this would work I just would want when outputting it shows 0 instead of the decimal but yea

#7

If you want to remove decimals completely just don’t shift the number over.
Honestly I think you may want to do this because in the case of 0.9999999999 you would want to output 1.

local Rounded = Vector3.new(
    math.floor(Direction.X + 0.5),
    math.floor(Direction.Y + 0.5),
    math.floor(Direction.Z + 0.5)
)

print(Rounded)

This does actual rounding [round(1.4) = 1, but round(1.5) = 2)] and not floor rounding [floor(1.4) = 1 and floor(1.5) = 1].

#8

You could also use the function math.round for rounding instead of adding 0.5 while flooring.

#9

Luau doesn’t have math.round?

edit: I must’ve missed it as it isn’t listed

#10

It does. It was added months ago.
https://developer.roblox.com/en-us/resources/release-note/Release-Notes-for-443

Added math.round to standard math library which rounds the number to nearest integer.

1 Like
#11

I chose not to use round because of this

2 Likes