Raycast is offset from mouse position

[Whincify]

While raycasting to determine the bullet target, the raycast does not go to the mouse position but instead to a position offset from the mouse position. Does anyone know why this is? The solutions I found on the DevForum did not work, some made the offset lesser but none solved the problem entirely. Thank you in advance for any help.

Code:

local fromP = self.model.Effects.Position
	
	local direction = (position - fromP).Unit * self.settings.RANGE
	local raycastParams = RaycastParams.new()
	raycastParams.FilterType = Enum.RaycastFilterType.Exclude
	raycastParams.FilterDescendantsInstances = {self.model, game.Workspace.Lasers, self.player.Character}
	raycastParams.IgnoreWater = false

	local result = workspace:Raycast(fromP, direction, raycastParams)	

	local midPoint = fromP + direction /2

	local laser = Instance.new("Part")
	laser.Parent = game.Workspace.Lasers
	laser.Anchored = true
	laser.CanCollide = false
	laser.Locked = true
	laser.BrickColor = BrickColor.new("Bright yellow")
	laser.Material = Enum.Material.Plastic

	--local random = Vector3.new(math.random(-spread, spread), math.random(-spread, spread), math.random(-spread, spread))

	laser.CFrame = CFrame.new(midPoint, fromP)-- + random/1000
	laser.Size = Vector3.new(.075, .075, direction.magnitude)
	
	game.Debris:AddItem(laser, self.settings.RATE)
	
	if (result and result.Instance) then
		print(result.Instance.Name)
		local character, humanoid = Global:GetTargetFromRaycast(result.Instance)
		
		if (character and humanoid) and (character ~= self.player.Character) then
			humanoid:TakeDamage(8)
			
			print("TODO: change to player module damage")
		end
	end

Video of the current behavior:

[htyfn1231101 (Xalanawer)]

Try raycast from the camera to the mouse position first, then raycast from the gun muzzle to the first raycast end position

Or just do raycasts based on camera position, and just visualize the raycast from the muzzle of the gun to the end point

[dthecoolest]

@Whincify

local fromP = self.model.Effects.Position

If fromP the target position is a part make sure it is anchored.

Raycasting Broken

Hey! The actual problem isn’t with the raycasting, but with your viewmodel. Your issue is caused by the fact that your velocity is increasing to approximately -8000 Y for every part of your gun. This is because your gun is unanchored, and can’t be noticed since you set your gun’s position directly prior to rendering, however the position will still continuously change while the velocity is so high. Whenever it wouldn’t work for you, that meant the HitFrom part went under the baseplate from the…

Normally people use mouse.Hit.Position instead.

[BlueDeveloper24]

in roblox the raycast is not from start to end point. the raycast is from start to direction. so its

workspace:Raycast(fromP, mousepos-fromP, raycastParams)

[Korpsii (FN Herstal)]

There’s 2 Ways to solve this,

First One is to set the Raycast Origin to the Camera Position

Second One is setting the Raycast Direction to Something like This

local Camera = workspace.CurrentCamera
local Direction = CFrame.new(Camera.CFrame.Position, Camera.CFrame.Position + Mouse.Hit.LookVector*1000).LookVector * Range

[Whincify]

For future reference, here is the updated code that works. I used @Korpsii’s suggestion.

local fromP = cameraPos --self.model.Effects.Position
	
	local direction = CFrame.new(cameraPos, cameraPos + mouseLV*1000).LookVector * self.settings.RANGE --(mousePos - fromP).Unit * self.settings.RANGE
	local raycastParams = RaycastParams.new()
	raycastParams.FilterType = Enum.RaycastFilterType.Exclude
	raycastParams.FilterDescendantsInstances = {self.model, game.Workspace.Lasers, self.player.Character}
	raycastParams.IgnoreWater = false

	local result = workspace:Raycast(fromP, direction, raycastParams)	

	local midPoint = fromP + direction /2

	local laser = Instance.new("Part")
	laser.Parent = game.Workspace.Lasers
	laser.Anchored = true
	laser.CanCollide = false
	laser.Locked = true
	laser.BrickColor = BrickColor.new("Bright yellow")
	laser.Material = Enum.Material.Plastic

	--local random = Vector3.new(math.random(-spread, spread), math.random(-spread, spread), math.random(-spread, spread))

	laser.CFrame = CFrame.new(midPoint, fromP)-- + random/1000
	laser.Size = Vector3.new(.075, .075, direction.magnitude)
	
	game.Debris:AddItem(laser, self.settings.RATE)
	
	if (result and result.Instance) then
		print(result.Instance.Name)
		local character, humanoid = Global:GetTargetFromRaycast(result.Instance)
		
		if (character and humanoid) and (character ~= self.player.Character) then
			humanoid:TakeDamage(8)
			
			print("TODO: change to player module damage")
		end
	end