Recreation of the Repulsion gel from Portal 2

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#1

Hello, im making a garry’s mod game on Roblox, with source engine games stuff, and ive been stuck on trying to recreate it

the issue is: i cannot negate the fall damage from the repulsion gel, and i want it to bounce you back up the same height as you fell

i did try looking at the forum but there was only 2 posts that did not help me

all i got is this

local part = script.Parent
local multiplier = 1.5 -- Adjust this to control bounce intensity
local debounceTime = 0.2
local debounce = {}

local function onTouched(otherPart)
    local character = otherPart.Parent
    local humanoid = character and character:FindFirstChildOfClass("Humanoid")
    local rootPart = character and character:FindFirstChild("HumanoidRootPart")
    
    if humanoid and rootPart and not debounce[character] then
        debounce[character] = true
        local incomingVelocity = rootPart.Velocity.Y
        local bounceForce = math.abs(incomingVelocity) * multiplier
        rootPart.AssemblyLinearVelocity = Vector3.new(rootPart.AssemblyLinearVelocity.X, bounceForce, rootPart.AssemblyLinearVelocity.Z)
        
        task.delay(debounceTime, function()
            debounce[character] = nil
        end)
    end
end

part.Touched:Connect(onTouched)
1 Like
#2

the issue looks like this
robloxapp-20250305-1139041.wmv (2.0 MB)

#3

Is the script actually running to start with? Have you checked with if-statements?

Also, you do not need to do character and character:… because we already know character is definitely an object.

#4

wait let me attempt that, ill update you

#5

i came up with some debugging and delete the character and character thing but it still doesnt work

local part = script.Parent
local multiplier = 1.5 -- Adjust this to control bounce intensity
local debounceTime = 0.2
local debounce = {}

print("Running")

local function onTouched(otherPart)
	local character = otherPart:GetRootPart().Parent
	local rootPart = character:FindFirstChild("HumanoidRootPart")

	if rootPart and not debounce[character] then
		print("checked")
		debounce[character] = true
		local incomingVelocity = rootPart.Velocity.Y
		local bounceForce = math.abs(incomingVelocity) * multiplier
		rootPart.AssemblyLinearVelocity = Vector3.new(rootPart.AssemblyLinearVelocity.X, bounceForce, rootPart.AssemblyLinearVelocity.Z)
		print("Bounced")

		task.delay(debounceTime, function()
			debounce[character] = nil
		end)
	end
end

part.Touched:Connect(onTouched)

everything is printing correctly and when it needs to, its just, not bouncing

#6

Ooohhhh, i think i found it, it might be because the union has can collide on,

#7

CanCollide? More like CanTouch off would be the issue. Check the collision box too.

1 Like
#8

collision fidelity is set to default, im gonna test it with box, then with precise if it doesnt work

#9

it kind of works, but only when i hold jump, and the force isnt fast enough, it lags a bit, enough to make me take fall damage
robloxapp-20250307-1856471.wmv (5.0 MB)

#10

precise made my studio not respond lol

#11

hull might be the best one but still, i need to hold jump for the gel to work

#12

You are always going to suffer lag and unreliability with Touch events. The best way to tackle it would be to use a raycast to detect the gel.

#13

that is such a great idea, thank you im going to test that!!

#14

thank you so much, it worked man!!!

#15

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