How would I get the direction a part is moving in by vector?

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#1

Hello. I am trying to make a sonic boom effect which includes a sound effect and a cone that moves outwards from the player position. How would I make this cone move away from the player from the opposite direction they’re moving towards?

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By the way, here is the current code I have (only the code for setting the cone cframe)

function repeatfunction(f,args,t) --repeats the given function every heartbeat for t seconds
	local current = tick()
	local i = 0
	repeat
		i += 1
		f(i)
		rs.Heartbeat:Wait()
	until math.abs(tick()-current)>=t
	
	return
end
	repeatfunction(function(i)
			local hrp = char:WaitForChild("HumanoidRootPart")
			local cf = hrp.CFrame
			local pos = cf.Position
			
			--part.CFrame = CFrame.lookAt(pos+(cf.LookVector*-(15+(i*2))),pos)*CFrame.Angles(math.rad(-90),0,0)
			part.CFrame = CFrame.lookAt(pos-(hrp.Velocity),pos)*CFrame.Angles(0,math.rad(180),0)
		end,nil,2)

I already have all the code in for detecting the players speed and all of that. All I need is to find a way to get a vector for the direction the player is moving in. Like CFrame.LookVector. I tried velocity, but if the player moves fast, then the cone position will be super far away.

#2

Use the .Unit attribute of Vector3s. It will shorten the vector such that its magnitude is one.

print(Vector3.new(100, 200, 0).Unit) --> 0.4472135901451111, 0.8944271802902222, 0
2 Likes
#3

btw im pretty sure this can be simplified to:

part.CFrame = CFrame.lookAt(pos-hrp.Velocity, pos-hrp.Velocity*2)
#4

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