FiveM entity selection using NUI mouse

entity.lua

-- usage: local hit, endCoords, surfaceNormal, entityHit, entityType, direction = ScreenToWorld(flags, toIgnore)

function ScreenToWorld(flags, toIgnore)
    local camRot = GetGameplayCamRot(0)
    local camPos = GetGameplayCamCoord()
    local posX = GetControlNormal(0, 239)
    local posY = GetControlNormal(0, 240)
    local cursor = vector2(posX, posY)
    local cam3DPos, forwardDir = ScreenRelToWorld(camPos, camRot, cursor)
    local direction = camPos + forwardDir * raycastLength
    local rayHandle = StartShapeTestRay(cam3DPos, direction, flags, toIgnore, 0)
    local _, hit, endCoords, surfaceNormal, entityHit = GetShapeTestResult(rayHandle)
    if entityHit >= 1 then
        entityType = GetEntityType(entityHit)
    end
    return hit, endCoords, surfaceNormal, entityHit, entityType, direction
end
 
function ScreenRelToWorld(camPos, camRot, cursor)
    local camForward = RotationToDirection(camRot)
    local rotUp = vector3(camRot.x + 1.0, camRot.y, camRot.z)
    local rotDown = vector3(camRot.x - 1.0, camRot.y, camRot.z)
    local rotLeft = vector3(camRot.x, camRot.y, camRot.z - 1.0)
    local rotRight = vector3(camRot.x, camRot.y, camRot.z + 1.0)
    local camRight = RotationToDirection(rotRight) - RotationToDirection(rotLeft)
    local camUp = RotationToDirection(rotUp) - RotationToDirection(rotDown)
    local rollRad = -(camRot.y * pi / 180.0)
    local camRightRoll = camRight * cos(rollRad) - camUp * sin(rollRad)
    local camUpRoll = camRight * sin(rollRad) + camUp * cos(rollRad)
    local point3DZero = camPos + camForward * 1.0
    local point3D = point3DZero + camRightRoll + camUpRoll
    local point2D = World3DToScreen2D(point3D)
    local point2DZero = World3DToScreen2D(point3DZero)
    local scaleX = (cursor.x - point2DZero.x) / (point2D.x - point2DZero.x)
    local scaleY = (cursor.y - point2DZero.y) / (point2D.y - point2DZero.y)
    local point3Dret = point3DZero + camRightRoll * scaleX + camUpRoll * scaleY
    local forwardDir = camForward + camRightRoll * scaleX + camUpRoll * scaleY
    return point3Dret, forwardDir
end
 
function RotationToDirection(rotation)
    local x = rotation.x * pi / 180.0
    --local y = rotation.y * pi / 180.0
    local z = rotation.z * pi / 180.0
    local num = abs(cos(x))
    return vector3((-sin(z) * num), (cos(z) * num), sin(x))
end
 
function World3DToScreen2D(pos)
    local _, sX, sY = GetScreenCoordFromWorldCoord(pos.x, pos.y, pos.z)
    return vector2(sX, sY)
end

local direction = camPos + forwardDir * raycastLength 

 **forwardDir is vector3 and raycastLenght is never initialized?...The code above doesn't work because of this**