initial_color = {r=100, g=0, b=250, bv=10, rv=7, gv=3}
colors = {}

function change_color_component(c, variance)
   c = c + variance
   if c > 255 then
      c = 255
      variance = -variance
   elseif c < 0 then
      c = 0
      variance = -variance
   end

   return c, variance
end

function process_node_color(n)
   local color
   color = colors[n] or initial_color
   color.r, color.rv = change_color_component(color.r, color.rv)
   color.g, color.gv = change_color_component(color.g, color.gv)
   color.b, color.bv = change_color_component(color.b, color.bv)
   colors[n] = color
   SetColor(n, color)
end

function process_node_pos(n)
   local pos
   pos = GetOriginalPosition(n)
   pos.x = pos.x + math.random(3) - 1
   pos.y = pos.y + math.random(3) - 1
   pos.z = pos.z + math.random(3) - 1
   SetPosition(n, pos)
end

function process_node(n)
   process_node_color(n)
   process_node_pos(n)
end