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    = {x = 0, y = 1, z = 0}
  24     local distance  = 4
  25     local start     = math.pi
  26     local t = start + 2 * math.pi * frame / frames
  27     local v = {
  28         x = math.cos(t),
  29         y = 0,
  30         z = math.sin(t),
  31     }
  32     return vec_add(vec_scale(v, distance), center)
  33 end
  34
  35 -- Define the code to calculate where the focal point of the scene is.
  36 local look = function(frame)
  37     return {x = 2, y = 1, z = 2}    -- keep focused on the buddha
  38 end
  39
  40 -- Define the actual objects of the scene that will be rendered, in the
  41 -- extended u3d format.
  42 local scene = [[
  43 L 0 1000000 0 1 1 1 1 1 1
  44 L 0 0 1000000 1 1 1 1 1 1
  45 g triangle.raw
  46 c 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
  47 t 2 0 -2
  48 s 1 1 1
  49 g dragon.raw
  50 M 0.3 0.3 0.3 5
  51 c 0.7 0.3 0.2 0.8 0.2 0.1 0.9 0.2 0.2
  52 t -2 -1 -2
  53 s 2 2 2
  54 g budda.raw
  55 c 0.1 0.2 0.7 0.1 0.3 0.9 0.2 0.1 0.8
  56 t 2 -1.5 2
  57 s 10 10 10
  58 g bunny.raw
  59 M 0.2 0.2 0.2 1
  60 c 0.9 0.8 0.9 0.8 0.7 0.9 0.9 0.8 0.7
  61 t -2 -1 2
  62 s 10 10 10
  63 g teapot2.raw
  64 M 1 1 1 128
  65 c 0 1 0 0 1 0 0 1 0
  66 t 0 -1 0
  67 s 0.6 0.6 0.6
  68 ]]
  69
  70 -- Set the number of concurrent renderings (for multi-core machines).
  71 local jobs = 6
  72
  73
  74 -- end of configuration
  75 ---------------------------------------------------------------------------
  76
  77 local fmt   = string.format
  78 local write = function(...) io.write(fmt(...)) end
  79
  80 function vec_add(a, b)
  81     return {x = a.x + b.x, y = a.y + b.y, z = a.z + b.z}
  82 end
  83
  84 function vec_scale(v, s)
  85     return {x = v.x * s, y = v.y * s, z = v.z * s}
  86 end
  87
  88 function render(i)
  89     while i do
  90         local filename  = fmt("frames/anim%04d.bmp", i)
  91         local command   = fmt("./rasterize -o %s >/dev/null", filename)
  92         local out = io.popen(command, "w")
  93         local e = eye(i)
  94         local l = look(i)
  95         write("\27[80D\27[2Kframe\t %4d / %d", i + 1, frames)
  96         out:write(fmt([[
  97 U3
  98 %d %d
  99 %f %f %f
 100 %f %f %f
 101 0 1 0
 102 1.57 %f 0.1 1000
 103 %s
 104 X
 105 ]], size.w, size.h, e.x, e.y, e.z, l.x, l.y, l.z, size.w/size.h, scene))
 106         i = coroutine.yield()
 107         out:close()
 108     end
 109 end
 110
 111 print("Animating scene...")
 112
 113 local threads = {}
 114 for i = 1,jobs do
 115     table.insert(threads, coroutine.wrap(render))
 116 end
 117
 118 os.execute("rm -rf frames && mkdir frames >/dev/null 2>&1")
 119 for i = 0,(frames-1) do
 120     threads[1 + (i % jobs)](i)
 121 end
 122 for _,thread in ipairs(threads) do thread(null) end
 123 print()
 124
 125 if os.execute("ffmpeg -i frames/anim%04d.bmp -b 1024k -y -an scene.avi") == 0 then
 126     print("Animation written to scene.avi.")
 127 end
 128