Make world in test scene larger and flatter.

rtiow/src/scenes/test.rs

@@ -53,8 +53,8 @@ pub fn new(opt: &Opt) -> Scene {
         )),
         // Earth sized sphere
         Box::new(Sphere::new(
-            Vec3::new(0., -100., 0.),
-            100.,
+            Vec3::new(0., -1000., 0.),
+            1000.,
             // Box::new(Lambertian::new(ground_color)),
             Box::new(Lambertian::new(Box::new(NoiseTexture::with_scale(10.)))),
         )),