Fix listing 29 missing rtweekend include

rjkilpatrick · rjkilpatrick · commit 39026fb8a779 · 2020-08-19T10:03:43.000+01:00
Resolves #691
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -5,6 +5,7 @@ Change Log -- Ray Tracing in One Weekend
 
 ### _In One Weekend_
   - Fix: replace old anti-alias result image with before-and-after image (#679)
+  - Fix: Listing 29: Added missing `rtweekend.h` include (#691)
 
 
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diff --git a/books/RayTracingTheNextWeek.html b/books/RayTracingTheNextWeek.html
@@ -1422,6 +1422,8 @@
     #ifndef PERLIN_H
     #define PERLIN_H
 
+    #include "rtweekend.h"
+
     class perlin {
         public:
             perlin() {
