Book 1 Updates 2

Author: rupsis

books/RayTracingInOneWeekend.html

@@ -2964,9 +2964,6 @@
     inline vec3 reflect(const vec3& v, const vec3& n) {
         return v - 2*dot(v,n)*n;
     }
-    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++
-
-    ...
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     [Listing [vec3-reflect]: <kbd>[vec3.h]</kbd> vec3 reflection function]
 
@@ -3180,8 +3177,8 @@
 
 The amount that a refracted ray bends is determined by the material's _refractive index_. Generally,
 this is a single value that describes how much light bends when entering a material from a vacuum.
-Glass has a refractive index of something like 1.5&ndash;1.7, and air has a small refractive index
-of 1.000293.
+Glass has a refractive index of something like 1.5&ndash;1.7, diamond is around 2.4, and air has a
+small refractive index of 1.000293.
 
 When a transparent material is embedded in a different transparent material, you can describe the
 refraction with a relative refraction index: the refractive index of the object's material divided
@@ -3213,8 +3210,7 @@
   $$ \eta \cdot \sin\theta = \eta' \cdot \sin\theta' $$
 
 Where $\theta$ and $\theta'$ are the angles from the normal, and $\eta$ and $\eta'$ (pronounced
-"eta" and "eta prime") are the refractive indices (typically air = 1.0, glass = 1.3–1.7, diamond =
-2.4). The geometry is:
+"eta" and "eta prime") are the refractive indices. The geometry is:
 
   ![Figure [refraction]: Ray refraction](../images/fig-1.17-refraction.jpg)
 
@@ -3971,6 +3967,8 @@
 `random_in_unit_sphere()`, just for two dimensions.
 
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++
+    ...
+
     inline vec3 unit_vector(const vec3& u) {
         return v / v.length();
     }
@@ -3984,6 +3982,9 @@
                 return p;
         }
     }
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++
+
+    ...
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     [Listing [rand-in-unit-disk]: <kbd>[vec3.h]</kbd> Generate random point inside unit disk]