FirstPersonScript

local player = game.Players.LocalPlayer
local char = player.Character
local RunService = game:GetService("RunService")

char.Humanoid.CameraOffset = Vector3.new(0,0, -1)

for i, v in pairs(char:GetChildren()) do
    if v:IsA("BasePart") and v.Name ~= "Head" then

        v:GetPropertyChangedSignal("LocalTransparencyModifier"):Connect(function()
            v.LocalTransparencyModifier = v.Transparency
        end)

        v.LocalTransparencyModifier = v.Transparency

    end
end

RunService.RenderStepped:Connect(function(step)
    local ray = Ray .new(char.Head.Position, ((char.Head.CFrame + char.Head.CFrame.LookVector * 2) - char.Head.Position).Position.Unit)
    local ignoreList = char:GetChildren()

    local hit, pos = game.Workspace:FindPartOnRayWithIgnoreList(ray, ignoreList)

    if hit then
        char.Humanoid.CameraOffset = Vector3.new(0, 0, -(char.Head.Position - pos).magnitude)
    else
        char.Humanoid.CameraOffset = Vector3.new(0, 0, -1)
    end
end)