This looks like a slimmed down version of the book Realistic Ray Tracing writen by the same author Peter Shirley. The book is still very short ~200 pages and develops a raytracer.<p><a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;Realistic-Tracing-Second-Peter-Shirley&#x2F;dp&#x2F;1568814615&#x2F;ref=sr_1_4?s=books&amp;ie=UTF8&amp;qid=1453952161&amp;sr=1-4&amp;keywords=Ray+Tracing+Peter+Shirley" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;Realistic-Tracing-Second-Peter-Shirley...</a><p>He has also written one of my favorite general introductions to computer graphics if your looking for a usable survey text that has most of the basic formulas.<p><a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;Fundamentals-Computer-Graphics-Fourth-Marschner&#x2F;dp&#x2F;1482229390&#x2F;ref=sr_1_1?s=books&amp;ie=UTF8&amp;qid=1453952450&amp;sr=1-1" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;Fundamentals-Computer-Graphics-Fourth-...</a>