Dogcows Code - chaz/rasterize/blob - rotate.lua

   1 #!/usr/bin/env lua
   2
   3 --
   4 -- CS5600 University of Utah
   5 -- Charles McGarvey
   6 -- mcgarvey@eng.utah.edu
   7 --
   8
   9 -- Render a scene multiple times from different angles, like a camera
  10 -- rotating around the object of a scene.
  11
  12 local size = {w = 640, h = 480}
  13 local slices = 512
  14
  15 local center = {x = 0, y = 1, z = 0}
  16 local look = {x = -2, y = -1, z = -2}
  17 local distance = 4
  18 local start = math.pi
  19
  20 local scene = [[
  21 g teapot2.raw
  22 c 1.0 1.0 0.0 1.0 1.0 0.0 1.0 1.0 0.0
  23 t 0.0 0.0 0.0
  24 s 0.6 0.6 0.6
  25 g triangle.raw
  26 c 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
  27 t 2.0 0.0 -2.0
  28 s 1.0 1.0 1.0
  29 g dragon.raw
  30 c 0.7 0.3 0.2 0.8 0.2 0.1 0.9 0.2 0.2
  31 t -2.0 -1.0 -2.0
  32 s 2.0 2.0 2.0
  33 g budda.raw
  34 c 0.1 0.2 0.7 0.1 0.3 0.9 0.2 0.1 0.8
  35 t 2.0 -1.5 2.0
  36 s 10.0 10.0 10.0
  37 g bunny.raw
  38 c 0.9 0.8 0.9 0.8 0.7 0.9 0.9 0.8 0.7
  39 t -2.0 -1.0 2.0
  40 s 10.0 10.0 10.0
  41 ]]
  42
  43 function vec_add(a, b)
  44     return {x = a.x + b.x, y = a.y + b.y, z = a.z + b.z}
  45 end
  46
  47 function vec_scale(v, s)
  48     return {x = v.x * s, y = v.y * s, z = v.z * s}
  49 end
  50
  51 function render(i, v)
  52     while true do
  53         local out = io.popen("./project2 -", "w")
  54         out:write(string.format([[
  55 U3
  56 %d %d
  57 %f %f %f
  58 %f %f %f
  59 0.0 1.0 0.0
  60 1.57 %f 0.1 1000.0
  61 %s
  62 ]], size.w, size.h, v.x, v.y, v.z, look.x, look.y, look.z, size.w/size.h, scene))
  63         local a, b = coroutine.yield()
  64         out:close()
  65         os.rename("stdin.bmp", string.format("anim%04d.bmp", i))
  66         if a == null then
  67             break
  68         else
  69             i = a
  70             v = b
  71         end
  72     end
  73 end
  74
  75 local threads = {}
  76 local jobs = 3
  77 for i = 1,jobs do
  78     table.insert(threads, coroutine.wrap(render))
  79 end
  80
  81 for i = 0,(slices-1) do
  82     local t = start + 2 * i * math.pi / slices
  83     local v = {
  84         x = math.cos(t),
  85         y = 0,
  86         z = math.sin(t),
  87     }
  88     v = vec_add(vec_scale(v, distance), center)
  89     threads[(i % jobs) + 1](i, v)
  90 end
  91
  92 for k,v in ipairs(threads) do
  93     v(null)     -- clear up any leftover work
  94 end
  95