Fix camera initialization with explicit vup vector

hollasch · hollasch · commit a06f8f7b7712 · 2020-05-15T15:48:33.000-07:00
Resolves RayTracing#523
diff --git a/books/RayTracingInOneWeekend.html b/books/RayTracingInOneWeekend.html
@@ -2669,7 +2669,7 @@
 This allows us to change the viewpoint:
 
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++
-    camera cam(point3(-2,2,1), point3(0,0,-1), vup, 90, aspect_ratio);
+    camera cam(point3(-2,2,1), point3(0,0,-1), vec3(0,1,0), 90, aspect_ratio);
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     [Listing [scene-free-view]: <kbd>[main.cc]</kbd> Scene with alternate viewpoint]
 
