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

   1 #!/usr/bin/env lua
   2
   3 --
   4 -- CS5600 University of Utah
   5 -- Charles McGarvey
   6 -- mcgarvey@eng.utah.edu
   7 --
   8
   9 -- This program automates the process of creating simple fly-by animations.
  10 -- The rasters are saved in the `frames' directory, and if ffmpeg is
  11 -- installed, the frames will also be combined into a video file.  This script
  12 -- must be called from the same directory where the rasterize program is.
  13
  14 -- Set the width and height of the viewport.
  15 local size = {w = 640, h = 480}
  16
  17 -- Set the number of frames to be rendered for the animation.
  18 local frames = 360
  19
  20 -- Define the code to calculate where the camera is, in world coordinates.
  21 local eye = function(frame)
  22     -- just rotate around the center of the scene on the XZ plane
  23     local center    = vec_new(0, 1, 0)
  24     local distance  = 4
  25     local start     = math.pi
  26     local t = start + 2 * math.pi * frame / frames
  27     local v = vec_new(math.cos(t), 0, math.sin(t))
  28     return vec_add(vec_scale(v, distance), center)
  29 end
  30
  31 -- Define the code to calculate where the focal point of the scene is.
  32 local look = function(frame)
  33     -- keep the camera focused on the buddha
  34     return vec_new(2, 1, 2)
  35 end
  36
  37 -- Define the actual objects of the scene that will be rendered, in the
  38 -- extended u3d format.
  39 local scene = [[
  40 L 0 1000000 0 1 1 1 1 1 1
  41 L 0 0 1000000 1 1 1 1 1 1
  42 g ak47.obj
  43 c 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
  44 M 0.9 0.9 0.9 128
  45 g dragon.raw
  46 M 0.3 0.3 0.3 5
  47 c 0.7 0.3 0.2 0.8 0.2 0.1 0.9 0.2 0.2
  48 t -2 -1 -2
  49 s 2 2 2
  50 g budda.raw
  51 c 0.1 0.2 0.7 0.1 0.3 0.9 0.2 0.1 0.8
  52 t 2 -1.5 2
  53 s 10 10 10
  54 g bunny.raw
  55 M 0.2 0.2 0.2 1
  56 c 0.9 0.8 0.9 0.8 0.7 0.9 0.9 0.8 0.7
  57 t -2 -1 2
  58 s 10 10 10
  59 ]]
  60
  61 -- Set the number of concurrent renderings (for multi-core machines).
  62 local jobs = 6
  63
  64
  65 -- end of configuration
  66 ---------------------------------------------------------------------------
  67
  68 local fmt   = string.format
  69 local write = function(...) io.write(fmt(...)) end
  70
  71 function vec_new(x, y, z)
  72     return {x = x, y = y, z = z}
  73 end
  74
  75 function vec_add(a, b)
  76     return vec_new(a.x + b.x, a.y + b.y, a.z + b.z)
  77 end
  78
  79 function vec_scale(v, s)
  80     return vec_new(v.x * s, v.y * s, v.z * s)
  81 end
  82
  83 function render(i)
  84     while i do
  85         local filename  = fmt("frames/anim%04d.bmp", i)
  86         local command   = fmt("./rasterize -o %s >/dev/null", filename)
  87         local out = io.popen(command, "w")
  88         local e = eye(i)
  89         local l = look(i)
  90         write("\27[80D\27[2Kframe\t %4d / %d", i + 1, frames)
  91         out:write(fmt([[
  92 U3
  93 %d %d
  94 %f %f %f
  95 %f %f %f
  96 0 1 0
  97 1.57 %f 0.1 1000
  98 %s
  99 X
 100 ]], size.w, size.h, e.x, e.y, e.z, l.x, l.y, l.z, size.w/size.h, scene))
 101         i = coroutine.yield()
 102         out:close()
 103     end
 104 end
 105
 106 print("Animating scene...")
 107
 108 local threads = {}
 109 for i = 1,jobs do
 110     table.insert(threads, coroutine.wrap(render))
 111 end
 112
 113 os.execute("rm -rf frames && mkdir frames >/dev/null 2>&1")
 114 for i = 0,(frames-1) do
 115     threads[1 + (i % jobs)](i)
 116 end
 117 for _,thread in ipairs(threads) do thread(null) end
 118 print()
 119
 120 if os.execute("ffmpeg -i frames/anim%04d.bmp -b 1024k -y -an scene.avi") == 0 then
 121     print("Animation written to scene.avi.")
 122 end
 123