From 51416f5dfac39b6ede8340b57b9bed4eb3edc646 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Wed, 12 Jun 2024 21:26:19 +0100
Subject: Done Chapter 8

---
 rtiaw | 70 +++----------------------------------------------------------------
 1 file changed, 3 insertions(+), 67 deletions(-)

(limited to 'rtiaw')

diff --git a/rtiaw b/rtiaw
index 5fb7e5a..82e4303 100755
--- a/rtiaw
+++ b/rtiaw
@@ -1,79 +1,15 @@
 #!/usr/bin/env ruby
 
-start = Time.now.to_f
-
 $LOAD_PATH.unshift File.dirname(__FILE__) + '/lib'
 require 'interval'
 require 'vec3'
 require 'ray'
 require 'hittable'
+require 'camera'
 
-def ray_colour(ray, world)
-  if rec = world.hit(ray, Interval.new(0, Float::INFINITY))
-    return (Colour.new(1,1,1) + rec.normal) * 0.5
-  end
-
-  unit_dir = ray.direction.unit
-  a = (unit_dir.y + 1) / 2
-  Colour.new(1.0, 1.0, 1.0) * (1-a) + Colour.new(0.5, 0.7, 1.0) * a
-end
-
-# Define image
-width = 400
-aspect = 16.0 / 9
-max = 255
-
-# Calculate height
-height = (width / aspect).to_i
-height = height < 1 ? 1 : height
-
-# World
 world = Hittables.new
 world << Sphere.new(0,0,-1, 0.5)
 world << Sphere.new(0,-100.5,-1, 100)
 
-# Camera
-c_focallength = 1.0
-c_centre = Point.new(0,0,0)
-
-# Viewport
-v_height = 2.0
-v_width = v_height * width.to_f / height
-v_u = Vec3.new(v_width, 0, 0)
-v_v = Vec3.new(0, -v_height, 0)
-
-# Pixel deltas
-pd_u = v_u / width
-pd_v = v_v / height
-
-# Upper left pixel
-v_upperleft = c_centre -
-              Vec3.new(0, 0, c_focallength) -
-              v_u / 2 -
-              v_v / 2
-p_00loc = v_upperleft +
-          (pd_u + pd_v) / 2
-
-puts <<-EOH
-P3
-#{width} #{height}
-#{max}
-EOH
-
-height.times do |row|
-  $stderr.print "Scanlines remaining: %4d" % (height - row)
-  width.times do |col|
-    p_centre = p_00loc + (pd_u * col) + (pd_v * row)
-    ray_dir = p_centre - c_centre
-    ray = Ray.new(c_centre, ray_dir)
-
-    p_colour = ray_colour(ray, world)
-    puts p_colour.to_ppm
-  end
-  puts
-end
-
-finish = Time.now.to_f
-took = finish - start
-
-$stderr.puts "Done. Took %4.2f seconds. " % took
+camera = Camera.new(400, 16.0 / 9)
+camera.render(world)
-- 
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