How do i make this raycast to cast in the right direction? [UPDATE]

Hello. So i'm new to raycasting, and i'm having a problem with it. You see, i have an AI and i want him to jump if there's a part in front of him. And i would like to use raycasting. Though i'm not really sure on how do i make a ray that starts somewhere near the torso and ends somewhere in front of the torso. Kinda of like this photo: http://prnt.sc/8llfmp

Though i wasn't successful. The ray wasn't appearing in the front of the torso.

Here's what i got:

local rayStart = script.Parent.Torso.Position - Vector3.new(0,3,0)
local rayLook = rayStart+script.Parent.Torso.CFrame.lookVector
local ray, pos = Ray.new(rayStart,(rayLook-rayStart).unit)
local partOnRay = game.Workspace:FindPartOnRay(ray,script.Parent)

UPDATE: In my script, i created a part that's welded on the character and positioned on the position i wanted. With that, i could shoot the ray without making some bizarre math. Though, i have testing your answers and for some reason the ray is being casted from the part and it goes to the center of the world. I have checked if the part is in the right position and it is and it's also rotated in the correct rotation. Help?

Entire script (Raycasting line: 66):

-------------
--Variables--
-------------

local TC = script.Parent.Configuration.TeamColor.Value
local humanoid = script.Parent.Humanoid
local Pathfinding = game:GetService("PathfindingService")
local target = script.Parent.Target
local torso = script.Parent.Torso

---------------------
--Instance Creation--
---------------------

local rayPart = Instance.new("Part",script.Parent)
rayPart.Transparency = 1
rayPart.Size = Vector3.new(1,1,1)
rayPart.Position = Vector3.new(torso.Position.X,torso.Position.Y-2,torso.Position.Z+1)
rayPart.CanCollide = false
rayPart.Rotation = torso.Rotation
local weld = Instance.new("Weld")
weld.Part0 = torso
weld.Part1 = rayPart
weld.C0 =  CFrame.new()
weld.C1 = rayPart.CFrame:inverse() * torso.CFrame
weld.Parent = torso

-------------
--Functions--
-------------

--Move to Spawn Points
function MoveToSpawnPoint(s)
    --Creates variables and path
    local PF = Pathfinding:ComputeSmoothPathAsync(script.Parent.Torso.Position,s.Position,512)
    local points = PF:GetPointCoordinates()

    --visualizePath(points) 

    --Moves through the path
    local distance;
    local br = false
    for i = 1,#points do
        wait(0)

        --Breakes to:
        --Recreate the path or;
        --To move to an enemy if exists
        if br or target.Value ~= nil then break end

        --Move to the created points
        local count = 0
        repeat
            --Turns br(break) to true if needed
            count=count+1
            if count>20 or target.Value ~= nil then
                br = true
                break
            end
            --Move through the path
            if script.Parent == nil or script.Parent:FindFirstChild("Torso") == nil then
                return
            end
            humanoid:MoveTo(points[math.min(#points,i+1)],nil)

            local start = rayPart.Position
            local finish = (start-rayPart.CFrame.lookVector).unit*15
            local ray = Ray.new(start,finish)
            local partOnRay = game.Workspace:FindPartOnRay(ray,script.Parent)

            local beam = Instance.new("Part", workspace)
            beam.BrickColor = BrickColor.new("Bright red")
            beam.FormFactor = "Custom"
            beam.Material = "Neon"
            beam.Transparency = 0.25
            beam.Anchored = true
            beam.Locked = true
            beam.CanCollide = false

            local distance = (start - finish).magnitude
            beam.Size = Vector3.new(0.3, 0.3, distance)
            beam.CFrame = CFrame.new(start, finish) * CFrame.new(0, 0, -distance / 2)

            if points[i].Y>script.Parent.Torso.Position.Y+2.5 or partOnRay~=nil then
                humanoid.Jump = true
            end

            distance=(points[i]*Vector3.new(1,0,1)-script.Parent.Torso.Position*Vector3.new(1,0,1)).magnitude
            wait()
        until distance<5
    end
end

--Move to Enemy
function MoveToEnemy()
    if target.Value == nil then return end

    if (script.Parent.Torso.Position-target.Value.Torso.Position).magnitude >=10 then
        --Creates variables and path
        local PF = Pathfinding:ComputeRawPathAsync(script.Parent.Torso.Position,target.Value.Torso.Position,50)
        local points = PF:GetPointCoordinates()
        local distance;
        local br = false

        --Move through path
        for i = 1,#points do
            wait(0)
            --Breakes to:
            --Recreate the path; 
            --Move to a spawnpoint when the target doesn't exist or;
            --Move to the enemy without pathfinding
            if br or target.Value == nil then break end

            --Move to created points
            local count = 0
            repeat
                --Turns br(break) to true if needed
                count=count+1
                if target.Value == nil then 
                    br = true
                    break
                end
                if count>20 or (script.Parent.Torso.Position-target.Value.Torso.Position).magnitude <10 then
                    br = true
                    break
                end

                --Move through the path
                humanoid:MoveTo(points[math.min(#points,i+1)],nil)
                if script.Parent == nil or script.Parent:FindFirstChild("Torso") == nil then
                    return
                end
                if points[i].Y>script.Parent.Torso.Position.Y+2.5 then
                    humanoid.Jump = true
                end

                distance=(points[i]*Vector3.new(1,0,1)-script.Parent.Torso.Position*Vector3.new(1,0,1)).magnitude
                wait()
            until distance<5 
        end
    end
    --Move to the enemy without pathfinding if he's close
    if target.Value ~= nil then
        if (script.Parent.Torso.Position-target.Value.Torso.Position).magnitude <10 and target.Value.Humanoid.Health>0 then
            humanoid:MoveTo(target.Value.Torso.Position)
        end
    end
end

-------------
--Task Area--
-------------

while wait(0) do
    --Move to target if it exists
    if script.Parent.Target.Value then
        MoveToEnemy()
    --If theres not any enemy close, then go to the spawn points
    elseif script.Parent.Target.Value == nil and script.Parent.Spawn.Value ~= nil then
        MoveToSpawnPoint(script.Parent.Spawn.Value)
    end
end