X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Frasterize;a=blobdiff_plain;f=animate.lua;h=fb4ca825ee0b764fb0c02ef699e7167a8166631c;hp=9917cb148f9f2187a920917b45abc4d321b5e653;hb=143da66e7f625b7f195a115b9740a748ee003534;hpb=e00aec23409a0f95317c110305e6448ec882bd0e

diff --git a/animate.lua b/animate.lua
index 9917cb1..fb4ca82 100755
--- a/animate.lua
+++ b/animate.lua
@@ -20,21 +20,18 @@ local frames = 360
 -- Define the code to calculate where the camera is, in world coordinates.
 local eye = function(frame)
     -- just rotate around the center of the scene on the XZ plane
-    local center    = {x = 0, y = 1, z = 0}
+    local center    = vec_new(0, 1, 0)
     local distance  = 4
     local start     = math.pi
     local t = start + 2 * math.pi * frame / frames
-    local v = {
-        x = math.cos(t),
-        y = 0,
-        z = math.sin(t),
-    }
+    local v = vec_new(math.cos(t), 0, math.sin(t))
     return vec_add(vec_scale(v, distance), center)
 end
 
 -- Define the code to calculate where the focal point of the scene is.
 local look = function(frame)
-    return {x = 2, y = 1, z = 2}    -- keep focused on the buddha
+    -- keep the camera focused on the buddha
+    return vec_new(2, 1, 2)
 end
 
 -- Define the actual objects of the scene that will be rendered, in the
@@ -77,12 +74,16 @@ local jobs = 6
 local fmt   = string.format
 local write = function(...) io.write(fmt(...)) end
 
+function vec_new(x, y, z)
+    return {x = x, y = y, z = z}
+end
+
 function vec_add(a, b)
-    return {x = a.x + b.x, y = a.y + b.y, z = a.z + b.z}
+    return vec_new(a.x + b.x, a.y + b.y, a.z + b.z)
 end
 
 function vec_scale(v, s)
-    return {x = v.x * s, y = v.y * s, z = v.z * s}
+    return vec_new(v.x * s, v.y * s, v.z * s)
 end
 
 function render(i)