How to understand Raycasts?

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#1

I’ve been trying to understand raycasts for 1/2 hours and still could not understand them
I still can’t figure out how to make a raycast that actually works

This is the code that doesn’t work:

local part = workspace:FindFirstChild("RaycastPart")

local function FireRaycast()
	
	local rayOrigin = part.Position
	local rayDirection = Vector3.new(100,0,0)
	
	local raycastResult = workspace:Raycast(rayOrigin, rayDirection)
	
	if raycastResult then
		local hit = raycastResult.Instance
		
		print(hit)
	end
	
end

FireRaycast()
#2

The script works, but what do you want to do?

#3

RayOrigin is where the ray will start, RayDirection is where the ray will go

ray.instance is anything that the ray hit, heres a quick drawing that i made to hopefully make this easier to understand lol

image
image890×215 2.76 KB

#4

Oh wait it actually works

It’s probably becouse i only fired it once in the script and it hit nothing

#5

Thanks! This made it a bit more clear

I still don’t understand why the rayDirection is a position and not an orientation

#6

Also is there a way to have the ray allways shoot from the parts front surface?

#7

yea, you can have the raydirection be the parts lookvector

example code:

local part = workspace.raypart

while wait() do
	local ray = workspace:Raycast(part.Position, part.CFrame.LookVector*5)
	
	if ray then
		local inst = ray.Instance
		print(inst.Name)
	end
end
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