How do you change the gravity of a part, but keep the world gravity the same?

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#1
  1. What do you want to achieve?
    I want to change a part’s gravity value while keeping the world’s gravity. I’m working on a car that uses a different gravity value and I’m about to publish it as a free model and I want to give the car a different gravity value automatically rather than making an instruction manual that no one will probably read then call it “broken”.
  2. What is the issue?
    I don’t know how to change the gravity value of a specific part via script.
  3. What solutions have you tried so far?
    There were some topics that taught me how to do so, like this one here, but I don’t really understand how they worked, so I ditched it.

The car that I’m going to turn into a free model can be found here and it uses a different gravity value. The gravity value used in this game is 77.

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#2

BodyVelocity instance which exerts a force upwards on the part along the Y axis.

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#3 
local core = script.parent.car.core
local carParts = script.parent.car.core:GetChildren()
local bodyForce = Instance.new('BodyForce', core)
bodyForce.Name = 'Antigravity'
bodyForce.Force = Vector3.new(0, carParts:GetMass() * game.Workspace.Gravity - 20, 0) --lets say the gravity is 80, with this its now 60

this should work

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#4

I don’t think that’s right. I think it should be this.
Vector3.new(0, carParts:GetMass() * 20, 0)

As a body force, gravity still applies. And the 20 needs to be multiplied by the mass in order to provide adequate force. So this code should reduce gravity by 20.

#5

Does that mean 196.2 (The default world gravity) is now 176.2?

#6

That is what that means. Traditional antigravity code is GetMass() * gravity
If you want to increase force, make the second number negative.

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#7

Ok, so none of the calculations worked, they ended up like this…

Or maybe I didn’t get the code right…

for i, v in pairs(car:GetDescendants()) do
	if v:IsA("BasePart") then
		local bforce = Instance.new('BodyForce', v)
		bforce.Name = 'AG'
		bforce.Force = Vector3.new(0, v:GetMass() * game.Workspace.Gravity - 119.2, 0)
	end
end

for i, v in pairs(car:GetDescendants()) do
	if v:IsA("BasePart") then
		local bforce = Instance.new('BodyForce', v)
		bforce.Name = 'AG'
		bforce.Force = Vector3.new(0, v:GetMass() * 119.2, 0)
	end
end
#8

I found another formula from the gravcomp chassis, a modified version of the A-Chassis that uses the realistic gravity preset (Which feels like the moon, hence 77 value from earlier), but I don’t really know how it works.

BodyForce.Force = Vector3.new(0, v:GetMass()*(workspace.Gravity-39.2), 0)
#9

This bit needs to be in parentheses (so that 119.2 is also multiplied by mass)

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