How do I make a raycast go to bottom (with wall stick/gravity controller)

[K0nanVarvar2]

So I’ve seen 2 posts about that but they didn’t get an response:

How do I make a raycast go to exactly the bottom of the player's feet?

Hello, I’m trying to make an anti fly system in my game and I was told that using rays to find a part below a player is a good idea for a part of that system. I can’t seem to figure out how to get the ray to point right below the feet of the player so it can see if the part is there. I would appreciate help!

How to make part always touch the ground below the player

I have a custom effect for developer, But i need the part that holds the emitters to always be on the ground, No matter how high the player is. It always needs to touch the ground. But i have some issues with it. So i need some help Code: local rootpart = char.HumanoidRootPart local clone = game.ServerStorage.DevPlayerEffect:Clone() clone.Parent=rootpart clone.CanCollide=false clone.CanQuery=false clone.CanTouch=false clone.Anchored=true clone.Clusters.CanCollide=false …

I have situation the one that @winet have, i have wallstick/gravity controller script it means that player downwards will not be always Y axis and i need to raycast from player’s feet, how would i make that?

[JohhnyLegoKing]

If it’s not guaranteed that down will be equal to the -Y axis, then here’s what you’ll need to do to always raycast downwards from a character’s foot:

local origin = foot.Position

local raycastResult = workspace:Raycast(origin, origin + -foot.CFrame.UpVector * DISTANCE)

The foot variable will need to be the BasePart that’s acting as the character’s foot, and the DISTANCE variable will need to be a number value that determines the maximum length of the raycast (as an example, 8 for eight studs downwards)

[K0nanVarvar2]

can i use humanoidrootpart instead?

[JohhnyLegoKing]

Sure, all you’ll need to do is replace:

local origin = foot.Position

with:

local origin = humanoidRootPart.Position

and it should still work as you’d like it to

[K0nanVarvar2]

for some reasons it doesn’t work

			local origin = Player.Character:WaitForChild("HumanoidRootPart").Position

			local raycastResult = workspace:Raycast(origin, origin + -Player.Character:WaitForChild("HumanoidRootPart").CFrame.UpVector * 5)
			print("Position:", raycastResult.Position)

error: attempt to index nil with ‘Position’

[JohhnyLegoKing]

Player.Character has a chance to be nil since characters take time to load for both LocalScripts and server Scripts, so you’ll need to wait for it by doing this:

local character = Player.Character or Player.CharacterAdded:Wait()

local rootPart = character:WaitForChild("HumanoidRootPart")

local origin = rootPart.Position

local raycastResult = workspace:Raycast(origin, origin + -rootPart.CFrame.UpVector * 5)

[K0nanVarvar2]

i mean it works but not the way it should

it should go under player (green dot is the raycast position result)

[JohhnyLegoKing]

At the moment, only 1 raycast is being fired, so if the character’s still in the air when the raycast fires then the part won’t be on the floor. The raycast will need to be fired inside of a loop like so:

local RunService = game:GetService("RunService")

local character = Player.Character or Player.CharacterAdded:Wait()

local rootPart = character:WaitForChild("HumanoidRootPart")

RunService.PostSimulation:Connect(function()
	local origin = rootPart.Position

	local raycastResult = workspace:Raycast(origin, origin + -rootPart.CFrame.UpVector * 5)

	if raycastResult then
		print("Position:", raycastResult.Position)
	end
end)

[K0nanVarvar2]

no this is not the problem.
here like how it looks like

and it faces this way for some reasons while it should go down the player, and it prints attempt to index nil with ‘position’ because there is no end in this raycast (because it goes the wrong way, it should go under player not in an axis or in front. it should go under player)
and here how it should look like:

2nd example

[JohhnyLegoKing]

The formula should have worked correctly, but I was able to replicate the issues you’re experiencing

Currently working on a fix, but I’ll need a bit of time to test to make sure that it will fire straight down

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If I set the value of DISTANCE to 256 instead of 5, the part is being positioned correctly below the character. It seems there might be some issues with raycast accuracy for small distances

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@K0nanVarvar2 Here’s a place file with the now-working code (In a server Script inside of ServerScriptService): PartRaycastExample.rbxl (53.4 KB)

The main difference are that I’m using 256 instead of 5 as mentioned in my previous edit, and the addition of RaycastParams to filter out the player’s own character

[Gloriusjackal (Doordash)]

create a vector by writing HumanoidRootPart.Position - Head.Position, then multiply that vector by whatever scalar value you want. that should return you a downwards vector regardless of your current orientation