local step = 0.1
local time = 0
local angle = 0

local pi2 = 2*math.pi()


while true do
    angle = (angle + 0.1) % pi2
    local dx = math.sin(angle) / 2
    local dz = math.cos(angle) / 2
    commands.async.exec("execute Cobra_Tomtrein ~ ~ ~ particle reddust ~"..tostring(dx).." ~2.1 ~"..tostring(dz).." 0.1 0.8 1 1")
    commands.async.exec("execute Cobra_Tomtrein ~ ~ ~ particle reddust ~"..tostring(-dx).." ~2.1 ~"..tostring(-dz).." 0.1 0.8 1 1")
    os.sleep(time)
end