Refined algorithm steps for intersections while instancing

Author: trevordblack

books/RayTracingTheNextWeek.html

@@ -3159,13 +3159,13 @@
 The pseudocode for the `translate::hit` function above describes the function in terms of _moving_:
 
 1. Move the ray backwards by the offset
-2. Determine where (if any) an intersection occurs along the offset ray
-3. Move the intersection point forwards by
+2. Determine whether an intersection exists along the offset ray (and if so, where)
+3. Move the intersection point forwards by the offset
 
 But this can also be thought of in terms of a _changing of coordinates_:
 
 1. Change the ray from world space to object space
-2. Determine where (if any) an intersection occurs in object space
+2. Determine whether an intersection exists in object space (and if so, where)
 3. Change the intersection point from object space to world space
 
 

src/TheNextWeek/hittable.h

@@ -58,7 +58,7 @@ class translate : public hittable {
         // Move the ray backwards by the offset
         ray offset_r(r.origin() - offset, r.direction(), r.time());
 
-        // Determine where (if any) an intersection occurs along the offset ray
+        // Determine whether an intersection exists along the offset ray (and if so, where)
         if (!object->hit(offset_r, ray_t, rec))
             return false;
 
@@ -124,7 +124,7 @@ class rotate_y : public hittable {
 
         ray rotated_r(origin, direction, r.time());
 
-        // Determine where (if any) an intersection occurs in object space
+        // Determine whether an intersection exists in object space (and if so, where)
         if (!object->hit(rotated_r, ray_t, rec))
             return false;
 

src/TheRestOfYourLife/hittable.h

@@ -66,7 +66,7 @@ class translate : public hittable {
         // Move the ray backwards by the offset
         ray offset_r(r.origin() - offset, r.direction(), r.time());
 
-        // Determine where (if any) an intersection occurs along the offset ray
+        // Determine whether an intersection exists along the offset ray (and if so, where)
         if (!object->hit(offset_r, ray_t, rec))
             return false;
 
@@ -132,7 +132,7 @@ class rotate_y : public hittable {
 
         ray rotated_r(origin, direction, r.time());
 
-        // Determine where (if any) an intersection occurs in object space
+        // Determine whether an intersection exists in object space (and if so, where)
         if (!object->hit(rotated_r, ray_t, rec))
             return false;