Raycast returning nil

Help and Feedback Scripting Support
#1

Hey, everyoneI’ve been making a script that detects obstacles and check if you can jump over it with raycasts.
Something like this:
Screenshot_2481
(great drawing skills i know)

However the 2nd ray returns nil when it shouldn’t,
here’s the code:

			local FrontPosition = RaycastFront(Blob.RootPart)
			
			if FrontPosition ~= nil then
				if (FrontPosition.Position - Blob.RootPart.Position).Magnitude <= (Position - Blob.RootPart.Position).Magnitude and (FrontPosition.Position - Blob.RootPart.Position).Magnitude <= 2 then
					
					local BlacklistTable = {Blob}
					
					local function RaycastDown(Cast, Blacklist)
					
						local raycastParams = RaycastParams.new()
						raycastParams.FilterDescendantsInstances = Blacklist
						raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
						local raycastResult = workspace:Raycast(Cast, Cast - Vector3.new(0,100,0) * 500, raycastParams)
	
						if raycastResult then
								return raycastResult
							end
						end 
					
					local DownPosition = RaycastDown(FrontPosition.Position + Vector3.new(0,10000,0), BlacklistTable).Position
                 --[[^^ ERROR HAPPENS IN THIS LINE ^^ ]]				

					if (DownPosition - Blob.RootPart.Position) <= 6 then 
						Blob.RootPart.Position = DownPosition + Vector3.new(0,1,0)
						Animations.MoveTo(Blob, Position)
						break
					end
				end
			end

Error: ServerScriptService.Blob Animations:131: attempt to index nil with ‘Position’

Sorry about messy code.
Any help is appreciated!

2 Likes
#2

Can we see the full script? It seems like you made some custom functions, and there should be codes behind these functions.

#3

Shouldn’t your raycasts Vector3 Y Axis be negative instead of positive since you’re shooting the ray down on the Y axis, not up? It returns nil because it can’t find the property “Position” of the instance since no Raycast Instance was returned.

1 Like
#4

That’s the origin Vector3, not the direction as later in the function I make the direction go downwards:

#5

This is the function that you don’t see:

local function RaycastFront(Cast)
	local rayOrigin
	local rayDirection

	rayOrigin = Cast.Position
	rayDirection = Cast.CFrame.LookVector * 500

	local raycastParams = RaycastParams.new()
	raycastParams.FilterDescendantsInstances = {Cast.Parent}
	raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
	local raycastResult = workspace:Raycast(rayOrigin, rayDirection, raycastParams)

	if raycastResult then
		return raycastResult
	else
		return nil
	end
end
#6

You’re right, my bad. Maybe you’re going over the Raycasts range limit. Don’t set the origin to 10K blocks high. Lower the origin point and ray direction.

1 Like
#7

Thank you! I never knew raycasts had limits (I’m new to raycasts), thank you for pointing it out :)!

1 Like