node_box = { 
  type = "fixed",
  fixed = {
    {-0.5/5, -2.5/5, -0.5/5, 0.5/5, -1.5/5, 0.5/5},
    {0.5/5, -1.5/5, -1.5/5, 1.5/5, 1.5/5, -0.5/5},
    {-1.5/5, -1.5/5, 0.5/5, -0.5/5, 1.5/5, 1.5/5},
    {0.5/5, -1.5/5, 0.5/5, 1.5/5, 1.5/5, 1.5/5},
    {-1.5/5, -1.5/5, -1.5/5, -0.5/5, 1.5/5, -0.5/5},
    {-2.5/5, 0.5/5, -2.5/5, -1.5/5, 2.5/5, -1.5/5},
    {1.5/5, 0.5/5, -2.5/5, 2.5/5, 2.5/5, -1.5/5},
    {1.5/5, 0.5/5, 1.5/5, 2.5/5, 2.5/5, 2.5/5},
    {-2.5/5, 0.5/5, 1.5/5, -1.5/5, 2.5/5, 2.5/5},
  }
}

--[[
{-0.5, -0.5, -0.5, 0.5, -0.5, 0.5}
fixed = {{-1.5/5, -2.5/5, -1.5/5, -0.5/5, -0.5/5, -0.5/5},{0.5/5, -2.5/5, 0.5/5, 1.5/5, -0.5/5, 1.5/5},{0.5/5, -2.5/5, -1.5/5, 1.5/5, 0.5/5, -0.5/5},{-1.5/5, -2.5/5, 0.5/5, -0.5/5, 0.5/5, 1.5/5},},
fixed = {{-1.5/5, -2.5/5, -1.5/5, -0.5/5, 1.5/5, -0.5/5},{0.5/5, -2.5/5, -1.5/5, 1.5/5, 2.5/5, -0.5/5},{0.5/5, -2.5/5, 0.5/5, 1.5/5, 1.5/5, 1.5/5},{-1.5/5, -2.5/5, 0.5/5, -0.5/5, 2.5/5, 1.5/5}},
fixed = {{-1.5/5, -2.5/5, -1.5/5, -0.5/5, 2.5/5, -0.5/5},{0.5/5, -2.5/5, -1.5/5, 1.5/5, 2.5/5, -0.5/5},{0.5/5, -2.5/5, 0.5/5, 1.5/5, 2.5/5, 1.5/5},{-1.5/5, -2.5/5, 0.5/5, -0.5/5, 2.5/5, 1.5/5},},
]]--