From: Tim Vaughan <timv@ughan.xyz>
Date: Fri, 24 Feb 2023 13:22:39 +0000 (+0100)
Subject: Switched output format to P6.
X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=commitdiff_plain;h=13e125dc80612c40964a06888ac750095752dbac;p=raymarcher.git

Switched output format to P6.
---

diff --git a/Render.lua b/Render.lua
index 17f244d..57cb407 100644
--- a/Render.lua
+++ b/Render.lua
@@ -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)
@@ -64,15 +64,13 @@ 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()
 
diff --git a/Textures.lua b/Textures.lua
index ccc7dbc..bfa1262 100644
--- a/Textures.lua
+++ b/Textures.lua
@@ -168,6 +168,7 @@ Textures = {
    make_count_texture = make_count_texture,
    make_solid_pigment = make_solid_pigment,
    make_checkered_pigment = make_checkered_pigment,
+   make_image_pigment = make_image_pigment,
    make_mandelbrot_pigment = make_mandelbrot_pigment,
    map_rectangular = map_rectangular,
    map_spherical = map_spherical
diff --git a/mandel_wall.lua b/mandel_wall.lua
index 3c1f741..7f55cda 100644
--- a/mandel_wall.lua
+++ b/mandel_wall.lua
@@ -25,22 +25,12 @@ local scene = {
                       T.make_phong_texture(lights,
                                            T.map_rectangular(
                                               T.make_mandelbrot_pigment(
-                                                 make_image_pigment("images/wood1.ppm",1),
-                                                 make_image_pigment("images/wood2.ppm",1),
+                                                 T.make_image_pigment("images/wood1.ppm",1),
+                                                 T.make_image_pigment("images/wood2.ppm",1),
                                                  20),
                                               texture_x, texture_y),
                                            0.2, 1.0, 0, 1)),
 
-   -- sdf = P.make_plane(V.origin, plane_normal,
-   --                    T.make_phong_texture(
-   --                       lights,
-   --                       T.map_rectangular(
-   --                          -- T.make_solid_pigment({0.5,0.2,1.0}),
-   --                          T.make_checkered_pigment(
-   --                             make_image_pigment("images/wood1.ppm", 1),
-   --                             make_image_pigment("images/wood2.ppm", 1)),
-   --                          texture_x, texture_y), 0.2, 1.0, 0.5, 20)),
-                               
    camera = {location = V.new{0,-5,0},
              point_at = V.new{0,0,0},
              right = V.x,