Unable to cast value to object even after I use FindPartOnRayWithIgnoreList()

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#1

Helo, reader!

I was working on a game for about a week now, and now I was supposed to make a build system for it. I made a grid-based place system, which has no problems. Now, I’m trying to implement the delete block system, where I am running into an error: “Unable to cast value to Object”. I tried looking up the DevForum for this, and I got this topic. I tried using the :FindPartOnRayWithIgnoreList() method, but it’s still throwing up the same error.

My code:

		for i,v in pairs(workspace:GetChildren()) do
			local function checkForModels()
				for j,x in pairs(v:GetChildren()) do
					table.insert(ignoreList, x.Name)
					if x:IsA("Model") or v:IsA("Folder") then
						checkForModels()
					end
				end
			end
			if v.Name ~= player.Name.."Model" then
				table.insert(ignoreList, v.Name)
				if v:IsA("Model") or v:IsA("Folder") then
					checkForModels()
				end
			end
			
		end
		
		unitRay = mouse.UnitRay
		local ray = Ray.new(unitRay.Origin, unitRay.Direction * maxPlaceDistance)
		local part, pos, normal = workspace:FindPartOnRayWithIgnoreList(ray, ignoreList, false, true)

Above mentioned is just a snippet. Awaiting for response!

Thanking you,
-pranvexploder. :smiley:

1 Like
#2

Which line are you specifically talking about? Please highlight it.

#3

It appears your ignoreList contains strings. Strings (values) cannot be casted to objects (instances, as expected in your ignoreList).

Furthermore, checkForModels is called recursively without any parameters or exit condition. Once the recursive call is reached, it will end up in an infinite recursion and a stack overflow.
You should try adding the instance which’s children you want to check as a parameter and initially call it with v.

3 Likes
#4

Here is my new code:

		for i,v in pairs(workspace:GetChildren()) do
			if v.Name ~= player.Name.."Model" then
				table.insert(ignoreList, v)
				if v:IsA("Model") or v:IsA("Folder") then
					local function checkForModels()
						for j,x in pairs(v:GetChildren()) do
						table.insert(ignoreList, x)
						if x:IsA("Model") or v:IsA("Folder") then
							checkForModels()
						end
					end
				end
					checkForModels()
				end
			end
			
		end

Now, it is not throwing any errors, and not working either. I’m not sure why.

Edit: I’m making the part in LocalScript (however I’ll change it soon). Is this the problem? Even the ray is created in the LocalScript.

Edit 2: Nevermind, silly mistake. Got it working. Marking as solved. Thanks for help!

1 Like