Making a ray from the middle of the screen with the camera of a player

Help and Feedback Scripting Support
#1

Hello!

I want to make a grapple gun system but I have a problem with MOBILE.
So mouse.Target on mobile is not good. On mobile you can click anywhere on the screen while on a computer (Your mouse is locked) you can only press the middle. I want it to work on my mobile by pressing a button on the screen to fire your grapple gun and retract it by pressing the button again. But I need an alternative to mouse.Target to still know what part the mobile player is clicking on with their fake mouse else I don’t know which part to grapple to. I have tried searching for systems but I don’t have a clue on how to actually make it work. It just keeps on failing. Or the ray doesn’t hit any parts. And I don’t want it to face with the head orientation, I want it to rotate the ray with the camera rotation of the player. It’s in first person by the way.

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#2

Hey there! Have you tried using CFrame of workspace.CurrentCamera for the raycast?

#3

How would you go about making a ray with CFrame of the workspace.CurrentCamera?

#4

I want the length of the ray to be like 1000 studs long.

Center Cursor on Mobile
#5

You can do something like this (client side):

local camera = workspace.CurrentCamera
local cameraCF = camera.CFrame

local length = 1000
local params = RaycastParams.new()

local raycastResult = workspace:Raycast(cameraCF.Position, cameraCF.LookVector * length, params)

you can read more about raycasting over here: WorldRoot | Roblox Creator Documentation

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#6

Do you know how to get the position of where the ray hits. (Not the position of the part it hits) like mouse.Hit.Position but with rays.

#7

You are looking for raycastResult.Position

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#8

Doesn’t that get the position of the part it hits instead of the position that the ray interacts with the part.

#9

raycaseResult.Position is “The world space point at which the intersection occurred, usually a point directly on the surface of the instance.”, you can read more here: RaycastResult | Roblox Creator Documentation

2 Likes
#10

So that’s the different between Ray.new() and workspace:Raycast()

#11

Yes it is. workspace:Raycast() is newer and better while Ray.new() is old and deprecated.

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#12

it seems that the direction of the camera is a little above the center of the camera, I think this is due to the top bar. any way to fix this?

1 Like