The Shark app, however, prompts you to start a cleaning session and then asks you to select your cleaning preferences. The extra features are somewhat hidden or hard to find, unlike other apps, but this is an issue that can be fixed with app updates.
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Ray Tracing Gems Series Like other "gems" books, this series of books contains a collection of articles focused on ray tracing techniques for serious practitioners. It focuses on subjects commonly considered too advanced for introductory texts, yet rarely addressed by research papers.