feat: add scene of random spheres

scripts/scene.lua

@@ -1,18 +1,51 @@
-camera.pos = {-2.0, 2.0, 1.0}
-camera.center = {0.0, 0.0, -1.0}
+math.randomseed(os.time())
+
+camera.pos = {13.0, 2.0, 3.0}
+camera.center = {0.0, 0.0, 0.0}
 camera.up = {0.0, 1.0, 0.0}
 camera.fov = math.rad(20.0)
-camera.focus_dist = 3.4
-camera.lens_angle = math.rad(10.0)
-
-material_ground = Lambertian.new({0.8, 0.8, 0.0})
-material_center = Lambertian.new({0.1, 0.2, 0.5})
-material_left = Dielectric.new(1.5)
-material_bubble = Dielectric.new(1.0 / 1.5)
-material_right = Metal.new({0.8, 0.6, 0.2}, 1.0)
-
-scene:add(Sphere.new({0.0, -100.5, -1.0}, 100.0, material_ground))
-scene:add(Sphere.new({0.0, 0.0, -1.2}, 0.5, material_center))
-scene:add(Sphere.new({-1.0, 0.0, -1.0}, 0.5, material_left))
-scene:add(Sphere.new({-1.0, 0.0, -1.0}, 0.4, material_bubble))
-scene:add(Sphere.new({1.0, 0.0, -1.0}, 0.5, material_right))
+camera.focus_dist = 10.0
+camera.lens_angle = math.rad(0.6)
+
+material_ground = Lambertian.new({0.5, 0.5, 0.5})
+scene:add(Sphere.new({0.0, -1000.0, 0.0}, 1000.0, material_ground))
+
+for a = -11, 11 do
+    for b = -11, 11 do
+        local choose_mat = math.random()
+        local center = {}
+        center[1] = a + 0.9 * math.random()
+        center[2] = 0.2
+        center[3] = b + 0.9 * math.random()
+
+        if choose_mat < 0.8 then
+            local albedo = {}
+            albedo[1] = math.random() * math.random()
+            albedo[2] = math.random() * math.random()
+            albedo[3] = math.random() * math.random()
+            local material = Lambertian.new(albedo)
+            scene:add(Sphere.new(center, 0.2, material))
+        elseif choose_mat < 0.95 then
+            local albedo = {}
+            albedo[1] = 0.5 * math.random() + 0.5
+            albedo[2] = 0.5 * math.random() + 0.5
+            albedo[3] = 0.5 * math.random() + 0.5
+            local fuzz = 0.5 * math.random()
+            local material = Metal.new(albedo, fuzz)
+            scene:add(Sphere.new(center, 0.2, material))
+        else
+            local material = Dielectric.new(1.5)
+            scene:add(Sphere.new(center, 0.2, material))
+        end
+    end
+end
+
+material1 = Dielectric.new(1.5)
+scene:add(Sphere.new({0.0, 1.0, 0.0}, 1.0, material1))
+
+material2 = Lambertian.new({0.4, 0.2, 0.1})
+scene:add(Sphere.new({-4.0, 1.0, 0.0}, 1.0, material2))
+
+material3 = Metal.new({0.7, 0.6, 0.5}, 0.0)
+scene:add(Sphere.new({4.0, 1.0, 0.0}, 1.0, material3))
+