How to visualize a raycast?

[foolskarp (COG)]

I used one of alvinblox’s tutorials to make myself a gun. He showed how to raycast and all of that, the thing he didn’t show was how to visualize it. Sort of “see” the raycast. How would I do that? Here’s the code.

script.Parent.Fire.OnServerEvent:Connect(function(player, mousePos)

local raycastParams = RaycastParams.new()
raycastParams.FilterDescendantsInstances = {player.Character}
raycastParams.FilterType = Enum.RaycastFilterType.Blacklist

local raycastResult = workspace:Raycast(script.Parent.Handle.Position, (mousePos - script.Parent.Handle.Position)*300, raycastParams)

if raycastResult then
local hitPart = raycastResult.Instance
local model = hitPart:FindFirstAncestorOfClass(“Model”)

  if model then
  	if model:FindFirstChild("Humanoid") then
  		model.Humanoid.Health -= 30 
  	end
  end

end
end)

[sjr04 (uep)]

How do you visualize a raycast as a part?

It is explained there. Basically, without that offset, the part would be in the middle. You want its back face to be at the origin. [image] The part would be positioned right where the origin is. Now, that post was using the old raycasting API. I suggest you use the new one now. -- for more info on these, check out: -- https://developer.roblox.com/en-us/api-reference/function/WorldRoot/Raycast -- https://developer.roblox.com/en-us/api-reference/datatype/RaycastParams local result = workspa…

[foolskarp (COG)]

Something like this? Because it isn’t working.

script.Parent.Fire.OnServerEvent:Connect(function(player, mousePos)

local raycastParams = RaycastParams.new()
raycastParams.FilterDescendantsInstances = {player.Character}
raycastParams.FilterType = Enum.RaycastFilterType.Blacklist

local raycastResult = workspace:Raycast(script.Parent.Handle.Position, (mousePos - script.Parent.Handle.Position)*300, raycastParams)

if raycastResult then

  local distance = (script.Parent.Handle.Position - raycastResult.Position).Magnitude
  local p = Instance.new("Part")
  p.Anchored = true
  p.CanCollide = false
  p.Size = Vector3.new(0.1, 0.1, distance)
  p.CFrame = CFrame.new(script.Parent.Handle.Position,script.Parent.Handle.Position*300)*CFrame.new(0, 0, -distance/2)
  
  local hitPart = raycastResult.Instance
  local model = hitPart:FindFirstAncestorOfClass("Model")
  
  if model then
  	if model:FindFirstChild("Humanoid") then
  		model.Humanoid.Health -= 30 
  		wait(.5)
  		p:Destroy()
  	end
  end

end
end)

[sjr04 (uep)]

No, in fact I will leave you my tutorial, since the video you watched has some questionable practices.

How to make a raycasting gun

Preface Alright so the developer hub and old wiki had this, although a few months ago it was removed from the former because it was just so terribly outdated it was a joke. So I thought I should revive that old tutorial. A lot has happened since that tutorial, like new raycasting api being added and filtering enabled being enforced and that tutorial was just never updated. So I am making this with that all in mind. Let’s begin! Alright so first you will want your weapon. I grabbed a Colt…

@sjr04

	local origin = shoot_part.Position
	local direction = (position - origin).Unit*300
	local result = Workspace:Raycast(origin, direction)
	
	local intersection = result and result.Position or origin + direction
	local distance = (origin - intersection).Magnitude
	
	local bullet_clone = ServerStorage.Bullet:Clone()
	bullet_clone.Size = Vector3.new(0.1, 0.1, distance)
	bullet_clone.CFrame = CFrame.new(origin, intersection)*CFrame.new(0, 0, -distance/2)

I explain it further in there as well

[JedDevs (Theo)]

Crazy there’s no built in method for this yet, in UE4 it’s a toggle. Oh and uh - happy birthday!

[foolskarp (COG)]

I tried the tutorial, for some reason the bullet part is bugged, dont know why, i followed the whole tutorial.

gun tutorial bullet bug