Totoro Model Holographics

-- Totoro Model Holographics
local event = require('event')
local component = require('component')

local args = { ... }

if #args == 0  then
  print("Usage: holo <filename>")
  return
end

print("Loading...")

local holo = component.hologram
holo.setScale(4)
holo.clear()

color = {}
color[1] = 0xFFFFFF  -- white
color[2] = 0xFFA500  -- orange
color[3] = 0xFF00EE  -- fuchsia
color[4] = 0x1BA1E2  -- light blue
color[5] = 0xFFFF00  -- yellow
color[6] = 0x00FF00  -- light green
color[7] = 0xF472D0  -- pink
color[8] = 0x808080  -- gray
color[9] = 0xC0C0C0  -- light gray
color[10] = 0x00A0A0 -- teal
color[11] = 0xAA00FF -- violet
color[12] = 0x0000FF -- blue
color[13] = 0x825A2C -- brown
color[14] = 0x008A00 -- green
color[15] = 0xFF0000 -- red
color[16] = 0xFFFFFF -- black

-- load image
function load(filename)
  local model = {palette={}}
  local file = io.open(filename..".txt", "r")
  local palnum = 1
  print("Loading '"..filename.."' model...")
  for x=1, 32 do
    model[x] = {}
    for y=1, 48 do
        model[x][y] = {}
      for z=1, 48 do
        local i = string.byte(file:read(1))-48
        if i ~= 0 then
          if model.palette[i+10] == nil then model.palette[i+10] = palnum; model.palette[palnum] = i; print("New color: "..i.."("..palnum..")"); palnum = palnum%3+1; end
          model[x][y][z] = model.palette[i+10]
        else
          model[x][y][z] = 0
        end
      end
    end
    -- to avoid "too long without yielding" error
    os.sleep(0.01)
  end
  file:close()
  for i=1, 3 do
    if model.palette[i] == nil then model.palette[i] = 2 end
  end
  return model
end

function draw(model, angle)
  for x=1, 32 do
    for y=1, 48 do
      for z=1, 48 do
        if model[x][y][z] ~= 0 then
            holo.set(24 + (y - 24) * math.cos(angle) - (z - 24) * math.sin(angle), x, 24 + (z - 24) * math.cos(angle) + (y - 24) * math.sin(angle), model[x][y][z])
        end
      end
    end
  end
end

model = load(args[1])
for i=1, 3 do
  holo.setPaletteColor(i, color[model.palette[i]])
end
print("Done.")
angle = 0

while true do
  name, address = event.pull(0.01)
  if name == "key_down" then break end

  holo.clear()
  draw(model, angle)
  os.sleep(2)
  angle = math.random(0, math.pi*2) --(angle + math.pi/12)%(math.pi*2)
end