Reduced Render.eps.

[raymarcher.git] / Render.lua

diff --git a/Render.lua b/Render.lua
index 17f244d..f690ab7 100644 (file)
--- a/Render.lua
+++ b/Render.lua
@@ -12,12 +12,12 @@ local O = Operations
 require "Textures"
 local T = Textures
 
-local eps = 0.01
+local eps = 0.001
 local max_dist2 = 30^2
 local bg_col = {0.1,0.1,0.1}
 
 local function calculate_normal(sdf, l)
-   local delta = 1e-3;
+   local delta = eps/10
    return V.new{sdf(l+V.x*delta).dist-sdf(l-V.x*delta).dist,
                 sdf(l+V.y*delta).dist-sdf(l-V.y*delta).dist,
                 sdf(l+V.z*delta).dist-sdf(l-V.z*delta).dist}/(2*delta)
@@ -43,7 +43,7 @@ local function render(scene, width, height, filename)
    print("Rendering to file " .. filename .. "...")
    
    local f = io.open(filename, "w")
-   f:write("P3 ", width, " ", height, " 255\n")
+   f:write("P6 ", width, " ", height, " 255\n")
 
    local c = scene.camera
    local cam_dir = V.normalize(c.point_at - c.location)
@@ -54,7 +54,6 @@ local function render(scene, width, height, filename)
    local normalize = V.normalize -- optimization
    
    for y=1,height do
-
       if y % math.floor(height/10) == 0 then
          print(y/math.floor(height/10) * 10 .. "%")
       end
@@ -64,15 +63,13 @@ local function render(scene, width, height, filename)
       for x=1,width do
          local ray_dir = normalize(rayy + right*((x/width - 0.5)*c.fov))
          local col = march(c.location, c.location, ray_dir, scene.sdf, 0)
-         col = {math.min(col[1]*255, 255),
-                math.min(col[2]*255, 255),
-                math.min(col[3]*255, 255)}
+         col = {math.floor(math.min(col[1]*255, 255)),
+                math.floor(math.min(col[2]*255, 255)),
+                math.floor(math.min(col[3]*255, 255))}
 
-         f:write(math.floor(col[1]), " ", math.floor(col[2]), " ", math.floor(col[3]), " ")
+         f:write(string.char(col[1]), string.char(col[2]), string.char(col[3]))
       end
-      f:write("\n")
    end
-   f:write("\n")
 
    f:close()