Intersection detection for 3D2D not working

[The Shroom]

I'm attempting to detect when the player is aiming inside of a rectangle I'm drawing onto an entity using 3D2D drawing. I created a simple intersection test that returns true/false depending on if the position passed as is intersecting another position. (It does take size into account)

However the result isn't quite working as I expected.
The intersection function returns true even though the player isn't looking at the rectangle. It seems like the intersection is totally inaccurate. The only way to make it return false is to look way off into another direction.

Here's the intersection testing function:

function checkBounds2D(entPos, targetPos, targetSize, intersectPos)
    targetPos = entPos + targetPos
    return (targetPos.x < intersectPos.x and targetPos.y < intersectPos.y and (targetSize.x + targetPos.x) > intersectPos.x and (targetSize.y + targetPos.y) > intersectPos.y)
end

And here's the ENT:Draw function:
function ENT:Draw()
    self:DrawModel() -- Draws the model for the client.

    local ply = LocalPlayer()

    local minDist = 400
    if (ply:GetPos():Distance(self:GetPos()) < minDist) then

        local pos = self:GetPos() + Vector(0, -22, 0)
        local ang1 = Angle( 0, 0, 90 )

        local t = {}
        t.start = ply:GetShootPos()
        t.endpos = ply:GetAimVector() * 32 + t.start
        t.filter = ply
        local tr = util.TraceLine(t)

        local isInBounds = checkBounds2D(pos, Vector(-117, -216, 0), Vector(235, 470, 0), tr.HitPos)
        print (tr.HitPos)
        print(isInBounds)

        local bkgColor = Color(255, 255, 0, 255)

        if (isInBounds == true) then
            bkgColor = Color(255, 165, 0, 255)
        end

        cam.Start3D2D(pos, ang1, 0.2)
            surface.SetDrawColor( bkgColor )
            surface.DrawRect(-117, -216, 235, 470) -- X, Y,
        cam.End3D2D()

    end
end

I'm not really sure what I'm doing wrong. I've been playing around with the code for a few hours but I can't get it to work.

[SweptThrone]

If I'm reading this right, you need to test if the player's GetEyeTrace().Entity is your entity.

[The Shroom]

I tried redoing the intersection function, however I still get the same result.
Here's the new intersection function:

function ENT:IsAimIntersecting(xPos, yPos, width, height)

    local tr = LocalPlayer():GetEyeTrace()

    if (tr.Entity == nil) then
        return false
    end

    print(tr.Entity)

    if (tr.Entity:GetClass() != self:GetClass()) then
        return false
    end

    local aimPos = tr.HitPos
    if (xPos > aimPos.x and xPos + width < aimPos.x and yPos > aimPos.y and yPos + height < aimPos.y) then
        return true
    else
        return false
    end

end

And this is the ENT:Draw function:
function ENT:Draw()

    self:DrawModel()

    local ply = LocalPlayer()
    local minDist = 400

    if (ply:GetPos():Distance(self:GetPos()) < minDist) then

        local pos = self:LocalToWorld(Vector(13.1, -8, 0))
        local ang1 = self:LocalToWorldAngles(Angle(0, 90, 90))
        local scale = 0.1

        cam.Start3D2D(pos, ang1, scale)

            surface.SetDrawColor(REALPRINTER.UIBtnColor)
            surface.DrawRect(160, -246, 80, 20)

            if (IsAimIntersecting(pos.x + 160, pos.y - 246, 80, 20)) then
                print("INTERSECTING")
            else
                print("NOT INTERSECTING")
            end

        cam.End3D2D()

    end
end

[MrJegor_N]

You should be using util.IntersectRayWithPlane and check if it is inside your rect.

[The Shroom]

Hm, can't figure out how I should be using that function.

I found a forum post about it here. It didn't show the full implementation, but this is what mine ended up looking like (which also doesn't work)

function ENT:IsAimIntersecting(xPos, yPos, width, height)

    local trace = LocalPlayer():GetEyeTrace()
    local ply = LocalPlayer()
    local isec = util.IntersectRayWithPlane( self:EyePos(), self:EyeAngles():Forward(), Vector(xPos, yPos), trace.HitNormal )

if isec then

    local ap = pos - isec
    local ab = pos - Vector(xPos, yPos + height)
    local ad = pos - Vector(xPos + width, yPos + height)

    local ap_ab = Dot( ap, ab )
    local ab_ab = Dot( ab, ab )
    local ap_ad = Dot( ap, ad )
    local ad_ad = Dot( ad, ad )

    if 0 < ap_ab and ap_ab < ab_ab and 0 < ap_ad and ap_ad < ad_ad
    and IsLineOfSightClear( ply, isec ) then
        return true
    else
        return false
    end

end