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 = 512
  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 c 0.7 0.3 0.2 0.8 0.2 0.1 0.9 0.2 0.2
  51 t -2 -1 -2
  52 s 2 2 2
  53 g budda.raw
  54 c 0.1 0.2 0.7 0.1 0.3 0.9 0.2 0.1 0.8
  55 t 2 -1.5 2
  56 s 10 10 10
  57 g bunny.raw
  58 c 0.9 0.8 0.9 0.8 0.7 0.9 0.9 0.8 0.7
  59 t -2 -1 2
  60 s 10 10 10
  61 g teapot2.raw
  62 c 0 1 0 0 1 0 0 1 0
  63 t 0 -1 0
  64 s 0.6 0.6 0.6
  65 ]]
  66
  67 -- Set the number of concurrent renderings (for multi-core machines).
  68 local jobs = 6
  69
  70
  71 -- end of configuration
  72 ---------------------------------------------------------------------------
  73
  74 local fmt   = string.format
  75 local write = function(...) io.write(fmt(...)) end
  76
  77 function vec_add(a, b)
  78     return {x = a.x + b.x, y = a.y + b.y, z = a.z + b.z}
  79 end
  80
  81 function vec_scale(v, s)
  82     return {x = v.x * s, y = v.y * s, z = v.z * s}
  83 end
  84
  85 function render(i)
  86     while i do
  87         local filename  = fmt("frames/anim%04d.bmp", i)
  88         local command   = fmt("./rasterize -o %s >/dev/null", filename)
  89         local out = io.popen(command, "w")
  90         local e = eye(i)
  91         local l = look(i)
  92         write("\27[80D\27[2Kframe\t %4d / %d", i + 1, frames)
  93         out:write(fmt([[
  94 U3
  95 %d %d
  96 %f %f %f
  97 %f %f %f
  98 0 1 0
  99 1.57 %f 0.1 1000
 100 %s
 101 X
 102 ]], size.w, size.h, e.x, e.y, e.z, l.x, l.y, l.z, size.w/size.h, scene))
 103         i = coroutine.yield()
 104         out:close()
 105     end
 106 end
 107
 108 print("Animating scene...")
 109
 110 local threads = {}
 111 for i = 1,jobs do
 112     table.insert(threads, coroutine.wrap(render))
 113 end
 114
 115 os.execute("rm -rf frames && mkdir frames >/dev/null 2>&1")
 116 for i = 0,(frames-1) do
 117     threads[1 + (i % jobs)](i)
 118 end
 119 for _,thread in ipairs(threads) do thread(null) end
 120 print()
 121
 122 if os.execute("ffmpeg -i frames/anim%04d.bmp -b 1024k -y -an scene.avi") == 0 then
 123     print("Animation written to scene.avi.")
 124 end
 125