Real-Time Rendering Corrigenda for 2nd edition: minors

Very minor errors (mostly for the authors and the publisher)

• Page 34, Equation 3.14, the right arrow need not be on a separate line. Should follow to the right of the first line in 3.14. (thanks to Paulo Abreu)
• Page 45, in Equation 3.32, there should not really be an equation number. (thanks to Paulo Abreu)
• Page 46-47, equations 3.38-3.41: there should be a small space (done with "\," in LaTeX) after the argument for "\sin\phi\mb u_q", i.e., "\sin\phi\,\mb u_q". (thanks to Paulo Abreu)
• Page 57, line 7 from the bottom says ", and," remove the 2nd comma. (thanks to Paulo Abreu)
• Page 66, line 8 from the bottom, add space after the URL. (thanks to Paulo Abreu)
• Page 79, line 7 from the bottom, says "These topics are covered in Chapter 6)". Remove the parenthesis. (thanks to Paulo Abreu)
• Page 69: this fix needs a search and replace. We should use "_{\textit{diff}}" when we want to write something in the subscript. Most of these look good though, but "diff" is bad due to that the "ff" looks quite bad. Fix: \newcommand{\Diff}{\mathit{diff}} and do a global search and replace, replacing _{diff} for _{\Diff}. (thanks to Paulo Abreu)
• Page 108, there is a forward reference to Section 15.1.3. Add a reference to figure 3.17 as well. (thanks to Paulo Abreu)
• Page 109, first paragraph: the final period is missing. (thanks to Paulo Abreu)
• Page 128, the sentence after the bullet list should start "These three" instead of "These two". (thanks to Paulo Abreu)
• References, page 747 and forward: for all "Cited on p. XXX" there is too much space between "p." and the page number. (thanks to Paulo Abreu)
• Page 771, reference [341]: title should be "Real Shadows Real Time", i.e., no comma and capitals, and pages should be "28--31".