Maybe there are some typos

[kanition]

pbr-book-website/3ed-2018/Shapes/Other_Quadrics.html

Line 1355 in 02b496a

<title id="MathJax-SVG-1-Title">x squared plus y squared minus z squared equals negative 1 comma</title>

I really like this amazing work and thank you for your sharing this book!

I have a problem with the implicit form of the hyperboloid:
It is x^2+y^2-z^2=-1, which means that it is a two-sheet hyperboloid.
But the parametric form shows that it is generated by a rotating line passing through points (x1,y1,z1) and (x2,y2,z2),
which should be a one-sheet hyperboloid.
Maybe the implicit form of the hyperboloid should be changed to x^2+y^2-z^2=1 for consistency.

Reference:https://en.wikipedia.org/wiki/Hyperboloid

[kanition]

pbr-book-website/3ed-2018/Shapes/Triangle_Meshes.html

Lines 213 to 215 in 02b496a

	(analogous to a handle of a teacup). On a triangle mesh, the number of edges and
	vertices is furthermore related by the identity
	</p>

Maybe there is another typo: I guess you meant "the number of edges and faces ... "

[kanition]

pbr-book-website/3ed-2018/Shapes/Triangle_Meshes.html

Lines 2496 to 2497 in 02b496a

	</svg> to the right of the line,
	zero for points on the line, and negative for points to the left of the

pbr-book-website/3ed-2018/Shapes/Triangle_Meshes.html

Lines 2508 to 2509 in 02b496a

	<p>The edge function gives a positive value for points to the left of the
	line, and negative value for points to the right. Thus, if a point has

Maybe Figure 3.14 and its caption are inconsistent with the text. It should be:
Left to the line: e(p)>0
Right to the line: e(p)<0
On the line: e(p)=0

[kanition]

pbr-book-website/3ed-2018/Shapes/Subdivision_Surfaces.html

Line 2687 in 4c5c6f8

<tt>PREV(k)</tt>th edges of the <tt>i</tt>th child need to be set. To set the <tt>k</tt>th

Maybe you mean that "......the kth and PREV(k)th edges of the kth child need to be set"——
"ith child" should be changed to "kth child".

[kanition]

https://github.com/mmp/pbr-book-website/blob/02b496ae12670f8ffec2a6fe67cc30b07e57cba6/3ed-2018/Shapes/Managing_Rounding_Error.html#L1757

With e_b=255, non-zero significand bits correspond to special NaN values...

It should be "e=255" rather than "e_b=255".

[kanition]

https://github.com/mmp/pbr-book-website/blob/02b496ae12670f8ffec2a6fe67cc30b07e57cba6/3ed-2018/Shapes/Managing_Rounding_Error.html#L8932
Maybe the x∈... below "Using the bounds on d" should be x'∈....

[Connor24601]

Hi @kanition,
Fellow reader here. In the preface, the book states

As with earlier versions of the book, please send an email to authors@pbrt.org if you see any errors in the text or in the online conversion of it.

I recommend shooting them an email with this issue linked, if you haven't already.

[kanition]

Thank you for your advice. I'll try it.