Merge branch 'dev-major' into tdb/isotropic

Author: hollasch

CHANGELOG.md

@@ -37,6 +37,7 @@ Change Log -- Ray Tracing in One Weekend
 
 ### The Rest of Your Life
   - Fix: Added missing functionality for `isotropic` (#664)
+  - Fix: Variable `direction` was used without being defined in listing 11 (#831)
 
 
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