How would i get the "Starting Position"

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#1

Looking through posts for a answer to get impact force realistcly (somewhat)
and found this
image
(Detecting when a flung character has hit a wall - #4 by Dav_itt)
i already got m and v down, just trying to get d (the magnitude between the start position and the hit position)

While i can get the end / hit position, im not too sure how i would get the starting position

Heres what i currently got down

local ExplosivePart = script.Parent
local Nm = 10

local Vx = 0
local Vy = 0
local Vz = 0

local Distance

local Gst = false
local Get = false

local StartTime = tick()
local EndTime = tick()

local HitVelocity

local LastHit
local LastVelocity

local function A_1()
	local V = ExplosivePart.AssemblyLinearVelocity
	Vx = if V.X > 0 then V.X else 0  
	Vy = if V.Y > 0 then V.Y else 0  
	Vz = if V.Z > 0 then V.Z else 0 
	
end

local function A1()
	while task.wait() do
		local V = ExplosivePart.AssemblyLinearVelocity
		

		if Vy > 10 or Vx > 10 or Vz > 10 then
			if not Gst then StartTime = tick(); Gst = true end
		end
		
		if Get and Gst then
			local Vctr = (Vx+Vy+Vz)
		end
	end
end

A1()

ExplosivePart:GetPropertyChangedSignal("AssemblyLinearVelocity"):Connect(A_1)
ExplosivePart.Touched:Connect(function(Part)
	
end)

(edit)
Updated code

#2

I’m not great at math, but couldn’t you just store the current speed of the object upon hit?. Since its like Studs Per Second then you can use that as the distance traveled during collision, not too sure thought since I feel like if you have 9999999 acceleration and you went 0-100 without really moving much and you hit someone that could lead into a insta kill, assuming this is for like ramming damage :skull:

#3

Couldn’t you store the start position at the start of A1?

local VStart = ExplosivePart.CFrame

Then just refer to VStart once you hit your target, and calculate magnitude from there.

#4

.touched doesnt work in my favor most of the time, tried using it once on a conveyor and it just kept spamming the .touched event

No, kinda like gmod explosive barrels if they hit something hard enough they explode

#5

yeah but what if it is moved around before it gets launched or thrown off a cliff?
the starting position would be way farther than its real position from where it got thrown

#6

A1 gets called when it is thrown, correct?

#7

not really, A1 is just called as of right now
tried another method of getting it

local ExplosivePart = script.Parent
local Nm = 10

local Vx = 0
local Vy = 0
local Vz = 0

local Distance

local Gst = false
local Get = false

local StartTime = tick()
local EndTime = tick()

local HitVelocity

local LastHit
local LastVelocity

local function A_1()
	local V = ExplosivePart.AssemblyLinearVelocity
	Vx = if V.X > 0 then V.X else 0  
	Vy = if V.Y > 0 then V.Y else 0  
	Vz = if V.Z > 0 then V.Z else 0 
	
end

local function A1()
	while task.wait() do
		local V = ExplosivePart.AssemblyLinearVelocity
		

		if Vy > 10 or Vx > 10 or Vz > 10 then
			if not Gst then StartTime = tick(); Gst = true end
		end
		
		if Get and Gst then
			local Vctr = (Vx+Vy+Vz)
		end
	end
end

A1()

ExplosivePart:GetPropertyChangedSignal("AssemblyLinearVelocity"):Connect(A_1)
ExplosivePart.Touched:Connect(function(Part)
	
end)

thought i could get the “time it got thrown or pushed off a edge” by just checking if its velocity was high enough.

while this (kinda, but not really) works not sure how to get end time accurately now using this method

#8

had another idea to this type of method, if the part gets hit / on hit save the speed, and then check like .1 or a tick() later and check if the velocity dropped down or something.

then realized you can have negative velocity and this probably wouldn’t work

#9

You’re trying to find d right?
solving for d it would be: d = (m * v ^2) / (2 * f), where f /= 0

#10

So basically Distance = (Mass * Velocity^2) / (2 * ?) not sure where i get f

#11

Got it figured out

local ExplosivePart = script.Parent
local ToCancelFall = ExplosivePart.CancelFall.Value

local Touched = false
local Debug = false
local Vx = 0
local Vy = 0
local Vz = 0

local StartedFall = false
local EndedFall = false

local StartTime = tick()
local EndTime = tick()

local StartPos = Vector3.zero
local TouchedPos = Vector3.zero

local Force

ExplosivePart.Touched:Connect(function(Part)
	Touched = true
	TouchedPos = ExplosivePart.Position
end)

while task.wait() do
	local V = ExplosivePart.AssemblyLinearVelocity

	local X1 = if math.abs(V.X) > 0 then math.abs(V.X) else 0  
	local Y1 = if math.abs(V.Y) > 0 then math.abs(V.Y) else 0  
	local Z1 = if math.abs(V.Z) > 0 then math.abs(V.Z) else 0 
	
	if X1 > Vx then Vx = X1 end
	if Y1 > Vy then Vy = Y1 end
	if Z1 > Vz then Vz = Z1 end
		
	if Vy > 10 or Vx > 10 or Vz > 10 then
		if not StartedFall then StartTime = tick(); StartPos = ExplosivePart.Position; StartedFall = true end
	end

	if StartedFall then
		if Touched then
			local hit = false
			local V2 = ExplosivePart.Velocity
				
			if Vx - V2.X > Vx * .20 then hit = true end
			if Vy - V2.Y > Vy * .20 then hit = true end
			if Vz - V2.Z > Vz * .20 then hit = true end
				
			if hit == true then
				EndTime = tick()
					
				local Vctr = (Vx+Vy+Vz)^2
				local Mass = ExplosivePart.Mass
				local Distance = (TouchedPos - StartPos).Magnitude
				
				if Distance < 10*(Mass/3) then Distance = 10*(Mass/3) end
				Force = (Mass * Vctr / (2 * Distance))/100
				
				print(Force)
				if Force >= 5 then
					ExplosivePart:FindFirstChildWhichIsA("Humanoid"):TakeDamage(Force)
				end
				
				Vx = 0
				Vy = 0
				Vz = 0
				
				Distance = nil
				StartedFall = false
				Touched = false
				hit = false
				
				if Debug then
					print("Part fell for " .. EndTime - StartTime .. " Seconds")
				end
			else
				Touched = false
				print("false Signal")
			end
		end
	end
end