How to make crash physics?

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#1

How could I go about making crash physics?

To be more specific, I want to detect how hard the hit is, and depending on how hard the hit was either make something explode, go on fire or break welds.

Let me know if I should be more specific.

Any help is appreciated!

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#2

You can see the speed of the bodies in the direction of both and add their magnitudes to calculate the size of the explosion.

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#3

Could you elaborate on this?

need more character in post

#4

Here I leave you the main part and I attach an example.

part.Touched:Connect(function(hit)
	local p = (part.Position + hit.Position) / 2
	local int = (part.Velocity - hit.Velocity).Magnitude
	local exp = Instance.new("Explosion")
	exp.Position = p
	exp.BlastRadius = int
	exp.BlastPressure = int
	exp.Parent = game.Workspace
end)

ExplosionSegunVelocidad.rbxl (36,0 KB)

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#5

The BlastPressure must be large so you can multiply it by a fixed value.

exp.BlastPressure = int * 5000
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#6

I attach again the example changing the velocity of the bodies.

local part = game.Workspace.P1
local vel = 10
local fact_radius = 2
local fact_pressure = 10

part.Touched:Connect(function(hit)
	local p = (part.Position + hit.Position) / 2
	local int = (part.Velocity - hit.Velocity).Magnitude
	local exp = Instance.new("Explosion")
	print(int)
	exp.Position = p
	exp.BlastRadius = int * fact_radius
	exp.BlastPressure = int * fact_pressure
	exp.Parent = game.Workspace
end)

wait(20)

game.Workspace.P1.Velocity = Vector3.new(vel, 0, 0)
game.Workspace.P2.Velocity = -Vector3.new(vel, 0, 0)

ExplosionSegunVelocidad.rbxl (36,1 KB)

#7

if you use RigidConstraint

there are some Destruction properties to make it break depending on force

image
image1315×489 60 KB

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#8

There isn’t many tutorials on this, could you give some use case examples?

#9

The formula for calculating force is Force = Mass * Change in Velocity . You can get the velocity of a part using the Velocity property.

Here’s a bit of example code that should help get you started in the right direction:

local function onCollision(otherPart)
    local impactThreshold = 1000 -- Adjust this value based on your needs

    -- Calculate impact force
    local velocity = vehiclePart.Velocity
    local mass = vehiclePart:GetMass()
    local impactForce = mass * velocity.Magnitude

    -- Check if impact force is above the threshold
    if impactForce >= impactThreshold then
        -- Perform actions based on impact force
        if impactForce >= explosionThreshold then
            -- Create an explosion
            local explosion = Instance.new("Explosion")
            explosion.Position = vehiclePart.Position
            explosion.BlastRadius = 10
            explosion.BlastPressure = impactForce / 1000 -- Adjust as needed
            explosion.Parent = game.Workspace
            explosion:Fire()
        elseif impactForce >= fireThreshold then
            -- Insert code to start a fire effect here
        else
            -- Insert code to break welds or other actions here
        end
    end
end

-- Connect the collision event
vehiclePart.Touched:Connect(onCollision)

Hope this helps!1!!!

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#10

How could I detect if a different car hit my car at high speed and to break the parts on my car?

Also with the code you provided I’m not able to replicate the result onto a moving vehicle controlled by the player, it seems to work though on a free falling part in the workspace.

#11

This is the part where you exercise creative liberty as a programmer, as there are several ways to detect a different car hitting yours. The code provided, as mentioned, is just some sample code to get you started in the right direction.

#13

As stated, it is sample code that is best used for instruction and learning, and may need tweaking to fit your needs. You did not provide any sample code of your exact scenario, so I figured this was the best I could do.

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#14

Nothing I tweak fixes it.

#15

It may be that my code doesn’t work or that the functionalities aren’t being properly implemented, as the code is very minimal and may not have properly accounted for several variables I didn’t know about. I only code a little bit, and to my knowledge the code should be functional if not rudimentary, but my knowledge is limited because I mostly 3d model, so I do apologize for that.

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#16

I found the problem, for some reason the code doesn’t work on parts which are grouped together, I’m not sure why this is happening.

I think you cant get the velocity of a grouped part?

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#17

I got the solution from a different post:

It seems getting the velocity and mass of grouped parts uses a different property.

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#18

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