Unable to make a part stay still using AssemblyLinearVelocity

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#1

I’m trying to make a part float perfectly still using AssemblyLinearVelocity. Yes, I know it’s not ideal and there are things like LineForce, LinearVelocity, old bodymovers etc, however I would like to specifically do this using AssemblyLinearVelocity. I know it’s weird, but I need it that way.

The problem I’m having is that the part seems to always float downwards even when I set the velocity to 0. Here’s the code I’m using right now:

local Part = workspace:WaitForChild("Part")

game:GetService("RunService").Stepped:Connect(function()
	Part.AssemblyLinearVelocity = Vector3.new(0,0,0)
end)

Here’s a video of the issue:


So far, I’ve tried using the old deprecated Part.Velocity, and I’ve tried setting the part mass to Massless, and it still floats downwards. It also doesn’t change if I use Heartbeat or RenderStepped. I don’t want to use constraints, so I’m stuck here.

#2

Why not Just anchor it?

#3

I could, but for this specifically I want to use velocity since I need the part to move around. I simply just want the part not to be affected by gravity (which yes, I know there’s constraints, but I don’t want to use them in this case). I want to use velocity specifically, but I can’t make the part stay still.

#4

So you want it to have no gravity?

local Part = workspace.Part

local Att = Instance.new("Attachment", Part)

local VF = Instance.new("VectorForce")
VF.Force = Vector3.new(0, Part:GetMass() * workspace.Gravity, 0)
VF.Attachment0 = Att
VF.Parent = Part

Edit: If you want this code to work on a model, use this instead.

local Model = workspace.Model

for _, Part:BasePart? in Model:GetDescendants() do
    if Part:IsA("BasePart") then
        local Att = Instance.new("Attachment", Part)

        local VF = Instance.new("VectorForce")
        VF.Force = Vector3.new(0, Part:GetMass() * workspace.Gravity, 0)
        VF.Attachment0 = Att
        VF.Parent = Part
    end
end
#5

This all works but is it possible to do this without VectorForce? I tried just putting Mass * Gravity for the part’s Y velocity and it still doesn’t stay perfectly still.

#6

It might be possible without a vector force, but I don’t know how.