Weird Linear Velocity behavior | Roblox Studio Community | Page 1

pale sand Jul 3, 2025, 5:09 AM

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Im making a 1 combo and the rest work as intended except for the velocity part, it doesnt go straight in one direction as expected. The character in the video suppose to go in 1 straight direction but it doesnt, anyone know the reason and how to fix this?

sturdy parcel Jul 3, 2025, 6:12 AM

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i think its because the force is applied towards the humanoid root part's look vector, which is not facing forward because of the animation

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i might be wrong tho idk

red mist Jul 3, 2025, 7:17 AM

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The code you showed don't seem to have any issue, I tried it and everything was fine

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Maybe it is because of your sword not being Massless

red mist Jul 3, 2025, 7:19 AM

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pale sand Im making a 1 combo and the rest work as intended except for the velocity part, ...

If you could show us other parts of the code that might cause this issue, someone may figure it out.

vernal hornet Jul 3, 2025, 8:53 AM

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That's great bro, no straight movements is realistic due to the sword's mass

pale sand Jul 3, 2025, 9:45 AM

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red mist If you could show us other parts of the code that might cause this issue, someon...

this is the whole module for this weapon. The thing i forgot to mention is this only happen after i use the 3th skill air variable

📎 message.txt

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i think this bug is also caused by skill 2 ground variable but im not really sure, there is little to no different

pale sand Jul 3, 2025, 9:48 AM

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vernal hornet That's great bro, no straight movements is realistic due to the sword's mass

all part of the sword is massless

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nvm all of them cause this problem, is just not that bad as the 3th skill air variant ;/

red mist Jul 3, 2025, 9:55 AM

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So it is the aerial attack that you show at around 00:09 that makes the velocity acts like this?

pale sand Jul 3, 2025, 9:58 AM

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all of the skills

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i think except for skill 1

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my animation does not affect the hrp

red mist Jul 3, 2025, 10:00 AM

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When you look at the HumanoidRootPart's Rotation and it's Motor6D, everything looks ok?

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I don't see something wrong with the LinearVelocities

pale sand Jul 3, 2025, 10:01 AM

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let me check rq

red mist Jul 3, 2025, 10:03 AM

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I don't think it matters but why are you parenting the velocities to an Attachment rather than the Part itself

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I am curious

pale sand Jul 3, 2025, 10:03 AM

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pale sand Jul 3, 2025, 10:04 AM

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red mist I don't think it matters but why are you parenting the velocities to an Attachme...

dont we need to parent linear velocity to an attachment?

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im not familiar with velocity

red mist Jul 3, 2025, 10:07 AM

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I have not used LinearVelocity that much but I think it works with Parts

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Atleast BodyVelocity worked that way

red mist Jul 3, 2025, 10:08 AM

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pale sand

If you want to have a better look, select the HumanoidRootPart and run this inside your Command bar:

local function AddIndicator(Parent: BasePart)
    local Box = Instance.new("SelectionBox", Parent)
    Box.Adornee = Parent
    Box.LineThickness = 0.05
    
    local Cone = Instance.new("ConeHandleAdornment", Parent)
    Cone.Adornee = Parent
    Cone.CFrame = CFrame.new(Vector3.new(0, 0, -1.5))
end

AddIndicator(game.Selection:Get()[1])

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It doesn't look like your RootPart gets a unwanted Offset

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🤷
Maybe try not to use Attachments

pale sand Jul 3, 2025, 10:12 AM

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idek what affected the hrp rotation 😭

pale sand Jul 3, 2025, 10:15 AM

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red mist 🤷 Maybe try not to use Attachments

Linear Velocity require an attachment

red mist Jul 3, 2025, 10:15 AM

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Oh

pale sand Jul 3, 2025, 10:16 AM

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but i dont think thats the problem

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the attachment is always in the center of the hrp

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LMAOOO

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im going insane

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now

red mist Jul 3, 2025, 10:17 AM

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Your sword is Massless?

pale sand Jul 3, 2025, 10:17 AM

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i dont even have to use any skill

pale sand Jul 3, 2025, 10:17 AM

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red mist Your sword is Massless?

yes all parts

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are massless

red mist Jul 3, 2025, 10:17 AM

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Ok

red mist Jul 3, 2025, 10:17 AM

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pale sand i dont even have to use any skill

:/

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It just breaks from start??

pale sand Jul 3, 2025, 10:17 AM

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yeah

red mist Jul 3, 2025, 10:21 AM

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Try to add att.WorldPosition = hrp.AssemblyCenterOfMass, maybe...

pale sand Jul 3, 2025, 10:23 AM

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i think its fixed...

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let me do some test

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s

red mist Jul 3, 2025, 10:24 AM

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If it is not fixed, I have another idea

pale sand Jul 3, 2025, 10:25 AM

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what idea do you have?

red mist Jul 3, 2025, 10:25 AM

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Something like this:

pale sand Jul 3, 2025, 10:25 AM

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already tried that out

red mist Jul 3, 2025, 10:25 AM

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:(

pale sand Jul 3, 2025, 10:25 AM

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i think its fixed...

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oh my god

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finally

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I THINK ITS FIXED

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😭

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MAN TYSM

red mist Jul 3, 2025, 10:27 AM

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I found the solution on this DevForum post from 2022:
https://devforum.roblox.com/t/linear-velocity-rotating-the-character/1758753/10

Developer Forum | Roblox

Linear Velocity rotating the Character

Just realized something, my first time with linear velocity as well. The force is applied at the attachment position not at the center of mass which is the main reason why. There doesn’t seem to be a center of mass option as well, seems very incomplete vs vector force.

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Someone had a similar issue

pale sand Jul 3, 2025, 10:27 AM

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oml i hate roblox

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anyways tysm man

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i thought attachments are always at the center

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💀

red mist Jul 3, 2025, 10:28 AM

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Np, if it breaks again, mention me here or in DM

red mist Jul 3, 2025, 10:28 AM

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pale sand i thought attachments are always at the center

Same

pale sand Jul 3, 2025, 10:28 AM

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tysm man

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oh

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i think the RootAttachment of the hrp

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is in the middle

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let me try parent the velocities inside that

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nvm lol its now

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not

#Weird Linear Velocity behavior