donut spinning

local a = 0
local b = 0

game:GetService('RunService').RenderStepped:Connect(function()
    local z = {}
    local screen = {}

    for i = 1, 7040 do
        z[i] = 0
    end

    for i = 1, 1760 do
        screen[i] = " "
    end

    local j = 0
    while j < 6.28 do
        j = j + 0.07
        local i = 0
        while i <  
            i = i + 

             sinA = .(a)
             cosA = .(a)
             cosB = .(b)
             sinB = .(b)

             sini = .(i)
             cosi = .(i)
             cosj = .(j)
             sinj = .(j)

             cosj2 = cosj + 
             mess =  / (sini * cosj2 * sinA + sinj * cosA + )
             t = sini * cosj2 * cosA - sinj * sinA

             x = .( +  * mess * (cosi * cosj2 * cosB - t * sinB))
             y = .( +  * mess * (cosi * cosj2 * sinB + t * cosB))
             o = x +  * y
             N = .( * ((sinj * sinA - sini * cosj * cosA) * cosB - sini * cosj * sinA - sinj * cosA - cosi * cosj * sinB))

             y >   y <   x >   x <   z[o] < mess 
                z[o] = mess
                screen[o] = .(, .(N, ) + , .(N, ) + )
            
        
    

     output = {}
     index = , #screen 
        .(output, screen[index])
         index %  ==  
            .(output, )
        
    

    (.(output))
    (.(output))

    a += 
    b += 
)