ExampleFiveRings

-- 奥运五环
local radius = 10;
local inner_radius = radius * 0.8;
local thickness = 4;  -- thickness

local rings = {
  {pos = {-22, 0, 0 }, color="red"},
  {pos = {-11, 0, -9 }, color="green"},
  {pos = {0, 0, 0 }, color="black"},
  {pos = {11, 0, -9 }, color="yellow"},
  {pos = {22, 0, 0 }, color="blue"},
}

local function CreateRing(pos, c)
   push();
     color(c);
     translate(pos);
        difference();
          cylinder({ r = radius, h = thickness });
          cylinder({ r = inner_radius, h = thickness } );
   pop();
end


union();
scale(0.2);
for i=1, #rings do
    local ring = rings[i];
    CreateRing(ring.pos, ring.color);
end