Ray cast not working

Help and Feedback Scripting Support
1

I’m just trying to learn this so don’t criticize me for this… Anyway here is the script, it is a child of a tool

script.Parent.Activated:Connect(function()
    local ray = Ray.new(script.Parent.Part.CFrame.Position, script.Parent.Part.CFrame.LookVector * 100)
    print(ray.Direction)
end)
2

i don’t see anything necessarily wrong with your code, Are there any errors? or are you expecting something else to happen, beside the ray’s direction printing to the output?

3

There are no errors, and the direction is not printing. And how would you make the ray visible

4

Never mind I fixed by adding a handle (Which I forgot to do) but how would you make the ray visible?

5

The easiest way to visualize a ray is by instancing a part:

local function visualizeRay(ray)
	local part = Instance.new("Part")
	part.Size = Vector3.new(1, 1, ray.Direction.Magnitude)
	part.CFrame = CFrame.new(
		ray.Origin + ray.Direction/2, 
		ray.Origin + ray.Direction
	)
	part.Anchored = true
	part.CanCollide = false
	part.Parent = workspace
	
	coroutine.wrap(function()
		wait(5)
		part:Destroy()
	end)()
end
1 Like
6

Ok but I want to learn, so could you teach me about the raycast stuff? (I already know the other stuff in that script, I just need to learn the raycasting parts)

8

Raycasting is already a well-documented subject on the dev hub:

https://developer.roblox.com/en-us/api-reference/datatype/Ray

A Ray is a half-line, finite in one direction but infinite in the other. It can be defined by a 3D point, where the line originates from, and a direction vector, which is the direction it goes in.

You can identify BaseParts intersecting a Ray using Workspace:FindPartOnRay and its alternatives, for more information see Workspace.

There’s also a tutorial for raycasting; it uses the brand new :Raycast method instead of :FindPartOnRay, but it doesn’t matter which method to use (at the moment).