A handful of bugs in the implementation of pbrt have been found since the book publication; we won't include the corresponding source code changes as errata in this list. Please refer to the commits to the "book" branch of the source code for details of and fixes for those errors.
If you find any errors in the book not listed on this page, please send a note to [email protected].
| Page | Reporter | Error |
|---|---|---|
| 160 | Wei-Feng Huang | In the bottom displayed equation, the 1/2 factor should apply to both terms; there should be parenthesis around them. |
| 269 | Kostya Smolenskiy | In the second and third line of the third paragraph, replace "[128, 255]" with "[8, 15]" and replace "[128, 191]" with "[8, 11]". |
| 388 | Wei Tao | In Equation (6.4), the expression inside the square root should be "(p_z - z_f - p'_z)(p_z - z_f - 4f - p'_z)". |
| 808-809 | Tom van Bussel, 卡卡西, 曹家音, Anton Khabbaz, Mike Day, Rahul Malayappan | The right-hand side of Equation 14.1 is incorrect: it should have a factor of two and a "sin theta_h" factor in the numerator, no pi factor in the denominator, and the cosine factor in the denominators should be raised to the third power, not the fourth. The equivalent change also should be made to the integrand in the first equation on page 809. |
| 809 | Wei-Feng Huang, Antoine Büsch | The third displayed equation should be "\tan^2 \theta' = -\alpha^2 \log (1 - \xi)". In turn, the following text ", though we must take care..." should be deleted and the source code should be updated accordingly. |
| 820 | 卡卡西, Guo Xiaoxin, Anton Khabbaz | The numerator of Equation 8.20 should not include the \eta^2 factor. |
| 892 | Wei-Feng Huang | In the equation at the top of the page, the upper limit of the integral should be t_max. |
| 918 | Steve Hill | In the denominator in the displayed math, the "3/2" exponent should be outside the parenthesis. |
| 972 | Jinfeng Guo | In the 5th line of the third paragraph, "r \rightarrow \infty" should be "r \rightarrow 0". |
| Page | Reporter | Error |
|---|---|---|
| xxvi | Christophe Hery | In the 10th line of the 4th paragraph, "Christiphe Hery" should be "Christophe Hery". |
| xxviii | Hualin Xu | In the 4th line of the 3rd paragraph, "were was" should be "were". |
| 11 | Hualin Xu | In the 5th line of the 3rd paragraph, the full name of BSSRDF "bidirectional subsurface scattering reflectance distribution function" should be "bidirectional scattering surface reflectance distribution function" in order to correspond to the full name in Section 5.6.2. |
| 33 | Kostya Smolenskiy | The parenthetical in the last line of the first paragraph, "(not included here)", should be deleted. |
| 39 | Daniel McAllaster | In the third line of the second paragraph, "than it is" should be "as it is". |
| 42 | Kostya Smolenskiy | In the 2nd line of the 1st paragraph, "previous" should be "new". |
| 48 | Mike Day | In the 3rd line of the 4th paragraph, "continued to be use" should be "continued to use". |
| 49 | Per Christensen | In the 2nd to last line of the 2nd to last paragraph, "deisgned" should be "designed". |
| 51 | Matt Pharr | In the first line of the 3rd paragraph, "the Blue Sky studio" should be "Blue Sky Studios". |
| 51 | Antoine Büsch | In the third line of the 3rd paragraph, "attenation" should be "attention". |
| 51 | Matt Pharr | In the first line of the 7th paragraph, "RenderMan" should be in italics, to be consistent with other renderer names. |
| 59 | Per Christensen | In the first line of the last paragraph, "vectors" should be "vector". |
| 62 | Kostya Smolenskiy | The caption text for Figure 2.4(b) is unclear. A better phrasing would be: "If we consider the parallelogram formed by two vectors, the diagonals are given by w-v (dashed line) and -v-w (not shown)." |
| 64 | Kostya Smolenskiy | In the 4th paragraph, "form a coordinate system" should be "form an orthogonal coordinate system". |
| 65 | Nikola Bunjevac | In the first line of the caption of Figure 2.5, "v_1 h" should be "||v_1|| h". |
| 69-70 | Kostya Smolenskiy | The second method in the last fragment in page 69 should be moved to the first fragment on page 70. |
| 64 | Mike Day | In the right hand side of the second line of the first displayed equation, "v \cdot u" should probable be "u \cdot v". |
| 65 | Mike Day | In Equation 2.2, the absolute value of \sin \theta should be used. |
| 73 | Mike Day | In Equation 2.3, the first less-than sign should be a less-than or equal sign. |
| 79 | Mike Day | In the very last line of the page,"by a constant factor in both dimensions" should be "by a constant amount in all dimensions". |
| 82 | Mike Day | In the displayed math at the bottom of the page, a different symbol than an equals sign should be used (e.g. a left/right arrow), since this isn't strictly an equality. |
| 82 | Girish Ramesh | In the first line of Section 2.7.1, the point p should be p_o. |
| 82 | Kostya Smolenskiy | In the middle of the first paragraph of section 2.7.1, "four vectors" should be "four-vectors". |
| 86 | Tzu-Chieh Chang (張子捷) | In the 3rd line of the first paragraph, $[x y z 1]$ should be $[x y z 1]^T$. |
| 88 | Kostya Smolenskiy | In the 3rd line of the 4th paragraph, the words "normalized and" should be inserted before "orthogonal to each other". |
| 88 | Mike Day | In the paragraph after the first displayed math, "upper 3x3 components" should be "first three columns (or rows)" |
| 90 | Mike Day | In the paragraph after the first displayed math, "upper 3x3 components" should be "first three columns (or rows)" |
| 90 | Zejian Wang (王 泽健) | Figure 2.12 should show a counter-clockwise rotation. |
| 93 | Tzu-Chieh Chang (張子捷) | In the 2nd line of the 3rd paragraph, "row vector" should be "column vector". |
| 97 | Kostya Smolenskiy | The start of the caption of Figure 2.15 would be more clear as "Three spheres, reflected in a mirror..." |
| 97 | Kostya Smolenskiy, Mike Day | In the second paragraph of section 2.9, "179 degrees" should be "181 degrees". |
| 98 | Hualin Xu | In the 2nd-3rd lines of the 5th paragraph, "concatentation" should be "concatenation". |
| 101 | Hualin Xu | In the upper right element of the matrix in Equation (2.6), there should be an opening parenthesis after the 2. |
| 102 | Joey Litalien | Two lines above Equation 2.7, "q_1 onto q_2" should be "q_2 onto q_1". |
| 110 | Hualin Xu | In the 5th line of the first paragraph, "are are" should be "are". |
| 111 | Mike Day | In the second line of the 5th paragraph, the \in symbol should be \subset. |
| 114 | Kostya Smolenskiy | The displayed equation should be parenthesized such that c_3,x is multiplied by cos 2 \theta t and similarly for c_5,x, sin 2 \theta t. |
| 116 | Per Christensen | In the first line of the second paragraph, "a" should be inserted before "particular". |
| 117 | Kostya Smolenskiy | Because pbrt uses a left-handed coordiante system, in Figure 2.19, dp/du and dp/dv should be swapped so that the orientation of the normal from the cross product is correct. |
| 119 | Per Christensen | In the 4th line of the second paragraph, "same" should be inserted before "hemisphere". |
| 127 | Tim Lobner | Figure 3.2 uses x_0 and x_1 for the two slabs, while the text on p. 127 uses x_1 and x_2. |
| 148 | Kostya Smolenskiy, Zejian Wang (王 泽健) | The disk parameterization should be updated such that x is defined as ((1 - v)r + v r_i) \cos \phi, and similarly for y. (Doing so makes the partial derivatives correct, and that seems to be a better fix than changing the partial derivatives in the code, which flips the normal vector and makes disk light sources illuminate in the different direction.) |
| 148 | Per Christensen | In the first line of the 4th paragraph, insert "and" before "checks". |
| 153 | Kostya Smolenskiy | The very last displayed equation should be "F \approx 2V". |
| 154 | Kostya Smolenskiy | In the very first line, "twice as many vertices as faces" should be "twice as many faces as vertices". |
| 155 | Kostya Smolenskiy | In the second line of the third paragraph, insert ", and transforms the vectors to world space" after "values". |
| 155 | Hualin Xu | In the 3rd line of the 3rd paragraph, "object" should be "world". |
| 159 | Wei Tao | In the first displayed equation, "T" should be "P". |
| 160 | Kostya Smolenskiy | In the second line of the second paragraph, insert "length of the" before "cross product". |
| 161 | Kostya Smolenskiy | In the third line of the first paragraph, insert "twice" before "the area". |
| 161 | Zejian Wang (王 泽健) | In Figure 3.14, "e(p) > 0" and "e(p) < 0" should be swapped. The caption should also be updated accordingly. |
| 161 | Tzu-Chieh Chang (張子捷) | In the 2nd line after display equation (3.2), "p_i" should be "p_{(i + 1) \mod 3}" and "p_{(i + 1) \mod 3}" should be "p_{(i + 2) \mod 3}". |
| 162 | Yue Ren (任悦) | The final displayed equation could be read to be suggesting that t_max is equal one of the two values on the right hand of the brace, while the intended meaning is actually that the inequality t < t_max can equivalently be expressed in those two ways. |
| 162 | Bojian Wu | Either the implementation should use the variable "d" for the determinant, or the "d" in the 4th line of the 6th paragraph should be "det". |
| 165 | Antoine Büsch | In the last line of the last paragraph, "consisting" should be "consistent". |
| 166 | Tzu-Chieh Chang (張子捷) | In the third line of the first paragraph, "180" should be "90". |
| 166-167 | Kostya Smolenskiy | At the bottom of p.166, "ss and ns" should be "ns and ss". The following "ns and ts" should be "ts and ns". Then, the fragment at the top of page 167 should be modified correspondingly. |
| 176 | Per Christensen | In the third line of the caption for Figure 3.21, "side of edge" should be "side of the edge". |
| 177 | Per Christensen | In the first line of the caption for Figure 3.22, insert "this" before "part". |
| 180 | Jason Musgrave, SOH | In the 6th line of the third code fragment, "ray(pc.z)" should be "ray(*tHit)". |
| 186 | Mike Day | In the third line of the 4th paragraph, "modulus" should be "modulo". |
| 192 | Matthias B. Hullin | The section title is misspelled: it should be "Subdivision". |
| 199 | Hualin Xu | The start of last sentence of the first paragraph should be: "For any odd vertex on the edge of a face, ..." |
| 208 | Kostya Smolenskiy | Two lines above the displayed math, $e_b$ should be $e$. |
| 208-210 | Mike Day | $e_b$ and $e$ should be swapped throughout this section to better match conventional usage. |
| 209 | Mike Day | Strictly speaking, there is no such thing as "binary decimals". |
| 209 | JiangHeng Gui (卡卡西) | In the text under the second displayed equation, "1000001_2" should be "10000001_2" (i.e., one more zero in the middle). |
| 210 | Kostya Smolenskiy | At the start of the 6th and 8th paragraphs, "With $e_b = 255$" should be "With $e = 255$". |
| 213 (and later) | Mike Day | In Equation (3.8), \subset should be \in |
| 214 | Per Christensen | In the 4th line of the caption for Figure 3.41, change "ticks in" to "ticks on". |
| 215-228 | Mike Day | Many instances of \subset should be \element. |
| 223 | Kostya Smolenskiy | In equation 3.13, the plus/minus sign should just be a plus sign. |
| 226 | Mike Day | In the third paragraph, "reciprocal sum" should be "inverse of the sum". |
| 228 | Kostya Smolenskiy | Right before the first displayed equation, "transformed point" should be "transformed coordinate". |
| 234 | Yue Ren (任悦) | In the second to last displayed equation on the page, \gamma_2 should be \gamma_1. |
| 238 | Kostya Smolenskiy, 郭 勍 | In the second displayed equation in Exercise 3.1, "2Gz" should be "2Gx". |
| 260 | Artem Kharytoniuk, Haralambi Todorov | In the 2nd line of the second paragraph, 2^n-1 should be 2^(n-1)-1. |
| 260 | Mike Day | In the 4th line of the second paragraph, "6n" should be "3n". |
| 272 | Kostya Smolenskiy | In the last line of the first paragraph, "EncodeMorton3()" should be replaced with "LeftShift3()". |
| 277 | Kostya Smolenskiy | The total number of nodes in a binary tree (e.g. a BVH) is bounded by twice the number of leaf nodes minus one. Thus, in the second line of code on the page, the initializer could be "2 * nPrimitives - 1". |
| 277 | Yue Ren(任悦) | In the second line of the second paragraph, "LVBH" should be "LBVH". |
| 288 | Mike Day | In the third line of the second paragraph, "above child" should be "aboveChild". |
| 306 | Mike Day | In the 6th paragraph, "(n log n)" should be "O(n log n)". |
| 310 | Mike Day | In the second to last line of exercise 4.11, "relates" should be "relate". |
| 315 | Kostya Smolenskiy | The third line of the second paragraph, "offset" should be "offer". |
| 320 | Kostya Smolenskiy | The third line of the caption for Figure 5.2, "FromSampled()" should be "AverageSpectrumSamples()". |
| 322-325 | Michael Paul and Dave Neubelt | In the last sentence of the first paragraph of section 5.2.1, "an SPD" should be "an emissive SPD". Then, the three equalities in Equation (5.1) should have the "1 / \int Y(lambda) dlambda" factors removed. That factor should similarly be removed at the bottom of page 324 and from the code fragment at the top of p. 325. |
| 323 | Jonathon Cai | In the caption for Figure 5.3, the use of the word "convolved" in incorrect. |
| 327 | Neil You | The first line of the first displayed equation suggests the equality S(lambda) = x_\lambda X(\lambda) + y_\lambda Y(\lambda) + z_\lambda Z(\lambda) for an arbitrary SPD S(\lambda), which is not the case. The text should make more clear that we're making use of the tristimulus theory of color perception in that step. |
| 328 | Jonathon Cai | In the third paragraph, "ToRGB()" should be "ToRGBSpectrum()". |
| 330 | Mike Day | In the last code fragment, the second "if" test could just be "rgb[1] ≤ rgb[2]" since we already know that rgb[0] isn't the minimum. |
| 335 | Jonathon Cai | In the second to last line on the page, "means that" should be deleted. |
| 339 | Brian Collins / Movania Muhammad Mobeen | At the end of the second line of text, "intensity" should be "power". |
| 339 | Movania Muhammad Mobeen | In Equation (5.2), the numerator on the right-hand side should be "d^2 \Phi". |
| 345 | Hualin Xu | In the 1st line of the caption for Figure 5.15, "d_A" should be "d_omega". |
| 356 | Jonathon Cai | In the first line of the fifth paragraph, "an pointer" should be "a pointer". |
| 357 | Jonathon Cai | In the 4th line of the 3rd paragraph, "to set" should be "set". |
| 363 | Kostya Smolenskiy | In Figure 6.4, (0,0) should be at the upper left, and (xRes, yRes) at the lower right. |
| 365 | Per Christensen | In the last line of the last paragraph, delete "a" before "ray tracers". |
| 368 | Kostya Smolenskiy | In the first two lines of the 4th paragraph, "parallel incident rays...behind the lens" should be rewritten as "incident rays that are parallel to the optical axis and pass through the lens focus at a point behind the lens". (A similar fix should be made in the caption of Figure 6.6.) |
| 368 | Mike Day | In the second line of the fourth paragraph, the first "called" should be deleted. |
| 369 | Per Christensen | In the second line of the last paragraph, change "This boundary" to "The boundary". |
| 372 | Kostya Smolenskiy, Honghu Qian | In Figure 6.11(a), the point z should be to the right of z_f in order for the point z' to be behind z'_f. |
| 372 | Kostya Smolenskiy | In the 5th line of the caption for Figure 6.11, there should be a comma after d_c. |
| 379 | Hualin Xu | In the 3rd line of the 4th paragraph, "As in Section 6.2.3," should be deleted. Then, the following "lens" should be capitalized. |
| 388 | Kostya Smolenskiy | In the first line of the fifth paragraph, "focal" should be "focus". |
| 391 | Jonathon Cai | In the caption for Figure 6.23, $-\theta$ should be $\theta$. |
| 396 | Hualin Xu | In the 4th line of the 2nd paragraph, "times" should be "divided by". |
| 397 | Per Christensen | In the first line of the last paragraph, insert "of" after "implementation". |
| 398 | Hualin Xu | In the 3rd line of the 1st paragraph, "2006" should be "2007". |
| 408 | Kostya Smolenskiy, Martin Fischer | In the first displayed equation, the first case should be 1/T if |x| < t/2. |
| 408 | Kostya Smolenskiy, Martin Fisher | The last displayed equation should have "\Pi_{1/T}(\omega)" in place of "\Pi_T(\omega)". |
| 409 | Kostya Smolenskiy | The first displayed equation should have "sinc_{1/T}(x)" in place of "sinc(x)", where sinc_T(x) is defined as sinc(T x)". |
| 420 | Per Christensen | In the 4th line of the 4th paragraph, insert "the" before "volume". |
| 420 | Mike Day | The description of the "sup" operator is incorrect; the distinction between discrete and continuous sets isn't relevant. It'd be better described in terms of least upper bound. |
| 429 | Kostya Smolenskiy | In the third line of the third paragraph, "three" should be "two". |
| 438 | Mike Day | In the first line of item two in the list, "each the samples" should be "each of the samples". |
| 441 | Mike Day | In the caption to Figure 7.22, "nDims" should be deleted. |
| 441 (and beyond) | Per Christensen | We should distinguish between point sets (of fixed size), like Hammersley, and point sequences (of potentially infinite size), like Halton. |
| 447 | Zejian Wang (王 泽健) | In the 3rd line of the last paragraph, "value" should be "reversedDigits". |
| 450 | Per Christensen | In the third line of the last paragraph, change "can be lead to" to "can lead to". |
| 441 | Mike Day | In the first line under the displayed equation", "2, 4" should be "2, 3". |
| 447 | Zejian Wang (王 泽健) | In the third line of the last paragraph, "value" should be "reversedDigits". |
| 457 | Wei-Feng Huang | In Equation 7.9, "b^n" should be "b^{-n}". |
| 457 | Mike Day | In the fifth paragraph, "uint32t_t" should be "uint32_t". |
| 458 | Per Christensen | In the second line of the first paragraph, delete "now". |
| 459 | Per Christensen | In the 5th line of the second paragraph, insert "until" before "all". |
| 460 | Per Christensen | In the third line of the caption for Table 7.4, delete "with". |
| 461 | Zejian Wang (王 泽健) | In the displayed equation, "\sin \pi x / \tau" should be written as "\sin (\pi x / \tau)" to be more clear. |
| 461 | Christian Hipp | In the first line of the third paragraph, "the" should be inserted beforoe "heart". |
| 477 | Pavel Krajcevski | Contrary to what's written in the third paragraph, the triangle filter as implemented doesn't have a weight of 1 at its center. |
| 489 | Mike Day | At the end of the page's text, "is maintained" should be "are maintained". |
| 493 | Phillip Anthony Thomas | Three lines from the bottom of the page, "Note that number" should be "Note that the number". |
| 509 | Jonathon Cai | Figure 8.1(c) should probably be updated to make it more clear that with perfect specular reflection, there is only a single reflected direction. |
| 511 | Mike Day | In the first line of the last paragraph, "between two vectors" should be "between two vectors' $\phi$ values". |
| 518 | Kostya Smolenskiy | In the last line of the 4th paragraph, "\cos_t" should be "\cos \theta_t". |
| 530 | Per Christensen | In the second line of the last paragraph, "was" should be "as". |
| 530 | Mike Day | The last word on the page should be "reflection", not "refraction". |
| 533 | Per Christensen | There aren't any names for the parameters to the rho() methods in the second code fragment. (Inconsistent with the rest of the book). |
| 545 | Jeppe Frisvad | In Figure 8.20, \theta and \theta_h should be swapped (for consistency with their usage elsewhere). |
| 541 | Nate Park | In final paragraph, the equality \cos \theta = A&+(\omega) - A^-(\omega) should include a factor of dA on the left-hand side. |
| 545 | Nate Park | In the right-hand side of equation defining d\Phi_h, the two d\omega factors should be d\omega_i. |
| 545-548 | Jeppe Frisvad | Thoughout Section 8.4.4, \theta_h should be replaced with \theta (for consistency with earlier usage of \theta_h as the angle between \omega_h and the surface normal.) |
| 546 | Anton Khabbaz, Andreas Wendleder | Writing the Fresnel term as F_r(w_o) makes it unclear that its value also dependends on w_h. |
| 552 | Jinfeng Guo | In the last two lines of the third paragraph, "scenes/brdfs directory in the pbrt distribution" should be "brdfs directory in the pbrt scenes distribution". |
| 554 | Per Christensen | In the third line of the second paragraph, a comma should be inserted after the closing parenthesis. |
| 561 | 曹家音 | In the third line of Equation (8.29), the last term on the right hand side should be "-w_0". |
| 563 | Per Christensen | In the first line of the third paragraph, "the" before w_3 should be deleted. |
| 574 | Mike Day | In second and third line of the first paragraph, "orthogonal" should be "orthonormal". Then, "and unit length" should be added at the end of the following parenthetical comment. |
| 582 | Kostya Smolenskiy | In the first line of the second paragraph, "b1" should be "m1". |
| 602 | Mike Day, Peter Kristof | In order to match the equation above, two changes should be made to the code fragment. First, the dot product used to initialize "d" should be negated. Then, the expressions to initialize "tx" and "ty" should have the initial negation inside the parenthesis, applied only to the Dot() calls there. |
| 604 | Mike Day | In the two displayed equations, the "x + x'" terms should be "x - x'" and similarly for the "y + y'" terms. (No difference here, but that corresponds to the actual convolution formula.) |
| 606 | Mike Day | In the fifth line of the first paragraph, "reflection" should be "refraction". |
| 615 | Brian Green | In the second to last line of the first paragraph, "material's" should be "texture's." |
| 624 | Per Christensen | In the 7th line of the last paragraph, "the triangle filter" should be "trilinear interpolation". |
| 636 | Mike Day | The ray differentials don't necessarily give the major and minor axes of the ellipse. (And thus, both code and text should be correspondingly updated). |
| 636 | Mike Day | The definition for ellipse eccentricity is incorrect; what's being computed here is the ratio of the lengths of the two axes. |
| 638 | Mike Day | In the displayed equation at the bottom of the page, would be more clear to use $T$ for the texture function, since $t$ is also being used for a texture coordinate. |
| 655 | Srinath Ravichandiran | In the last line of text on the page above the displayed math, "f_s(s)" should be "f_s(x)". |
| 672 | Per Christensen | In lines 2-3 of the last paragraph, delete "given spatial extent". |
| 680 | Mike Day | In the last sentence of the second paragraph of section 11.2, "isotropic phase functions" should be "phase functions in isotropic media". |
| 689 | Tzu-Chieh Chang (張子捷) | In the displayed code 2/3 of the way down the page, "ray.Length()" should be "ray.d.Length()". |
| 692 | Mike Day | In first line, the hyphen in "scattering-surface" should be a space. |
| 695 | Mike Day | In the 6th line of the first paragraph, "the effect light" should be "the effect of light". |
| 707 | Mike Day | At the end of the second paragraph, "has been" should be "have been". |
| 708 | Mike Day | At the end of the last bullet point, "it" should be "then". |
| 709 | Per Christensen | In the third line of the first paragraph, "overall" should be "over all". |
| 709 | Mike Day | At the end of the pentultimate paragraph, "K is temperature in Kelvin" would be more clear as "where Kelvin (K) is the unit of temperature". |
| 710 | Mike Day | At the end of the second sentence in the caption of Figure 12.1, "as the temperature increases" is redundant. |
| 713 | Per Christensen | In the second line of the caption for Figure 12.3, delete "in". |
| 715 | Per Christensen | In the second line of the second paragraph, change "so that it's", to ", so it's". |
| 715 | Mike Day | At the end of the 4th paragraph, "calls for" should be "calls to". |
| 716 | Mike Day | In Figure 12.5, the "omega" symbol should have an "i" subscript. |
| 724 | Per Christensen, Mike Day | In the last line of the second paragraph, replace "width" with "cosFalloffWidth", and "fall" with "cosFalloffStart". |
| 741 | Antoine Büsch | In the 4th line of the second paragraph, "values" should be "varies". |
| 743 | Per Christensen | In the third line of the second paragraph, insert "from" after "illumination". |
| 748 | Mike Day | In the 4th line of the last paragraph, "fixed set" should be "fixed, finite set". |
| 749 | Mike Day | In the second line of the first paragraph, the first equals sign should be "\in". |
| 749 | Mike Day | In the first displayed equation, the < should be ≤ the ≤ should be <. |
| 750 | Özgür Cerlet | In the 5th displayed equation, the third expression should be "1/pi (sin pi - sin 0)". |
| 752 | Mike Day | In the bottom integral of the page, the order of the integral signs and limits should be reversed. |
| 754 | Antoine Büsch | In the last line of the caption for Figure 13.2, the "p_i" in the sum should be "p_j". |
| 760 | Per Christensen | Delete "in" at the end of the fourth line of the second paragraph. |
| 768 | Mike Day | In the last line of the page, "right side" should be "bottom". |
| 775 | Mike Day | In the first line of the first paragraph, there's one too many "safely". |
| 778 | Mike Day | In the second line of the second paragraph, "of the square" should be deleted. |
| 778 | Per Christensen | In the last line of text, "two wedges" should be "seven wedges". |
| 780 | Per Christensen | In the second line of the caption for Figure 13.14, "sphere" should be "hemispehre". |
| 788 | Jonathan Klein | In the displayed math at the bottom of the page, "dw" should be the first differential term after the integrand. Also, "dx dy" should be "dA". |
| 801 | Per Christensen | In the last line of Exercise 13.2, O(\sqrt{n}) should be O(n). |
| 806 | Jonathan Klein | In the third line of the second to last paragraph, there should be a period after "coordinate system". |
| 808 | Mike Day | In the second line of the third paragraph, strictly speaking, tan^2 theta isn't an angle. |
| 812 | Jeppe Frisvad | In Figure 14.4, \theta_h should be \theta. |
| 813 | Jeppe Frisvad | In the numerator of the right hand side of the last displayed equation on the page, \theta should be \theta_h. |
| 818 | Mike Day | In the 5th line of the third paragraph, "a inner" should be "an inner". |
| 818 | Mike Day | In the last line of the 5th paragraph, "\mu angles" should be "\mu angle cosines". |
| 819 | Mike Day | In the 6th line of the last paragraph, "unit radian" should be "radian". |
| 820 | Mike Day | In the first line of the second paragraph, "angles" should be "values". |
| 820 | Mike Day | In the displayed equation, the "d\theta_i" shouldn't be primed. |
| 822 | Mike Day | In the second line of the 5th paragraph, \xi should be \xi_1. |
| 823 | Matt Pharr | In the first line of the third code fragment, there are two spaces after the comma. |
| 825 | Alexander Brassel | In the paragraph under the first fragment, "values[i]" should be "x[i]". |
| 828 | Matt Pharr | In the first line of the third paragraph, there should be a comma after "(8.22)". |
| 828 | Zejian Wang (王 泽健) | In the summation in Equation 14.9, there should be a factor of a_k. |
| 829 | Per Christensen | In the second line of the first paragraph, "sample in the each" should be "sample in each". |
| 845 | Per Christensen | In the second line of the third paragraph, "value it returns from" should be "value it returns". |
| 849 | Mike Day | In the 4th line of the 4th paragraph, [0,1]^2 should be [0,1)^2. |
| 851 | Per Christensen | In the second line of the first paragraph, "only accounts for only" should be "only accounts for". |
| 862 | Mike Day | In lines 4-5 of the 5th paragraph, "coming in" and "going out" should be swapped. |
| 863 | Mike Day | In Figure 14.14's caption, "trace operator" should be "ray-casting function". |
| 867 | Mike Day | In the 6th line of the first paragraph, "the camera ray origin and the point that it intersects" should be "the camera ray origin and the point that the camera ray intersects". |
| 870 | Mike Day | In the first line of the third paragraph, "i-1" should be "n-1". |
| 875 | Wenzel Jakob | In the first displayed equation, p_A should be p_A(p_i), the denominator should be p_{i+1}-p{i} (for consistency with the earlier definition), and similarly, the following line should read "...terms of the geometric term G(p_{i+1} <-> p_{i})". |
| 884 | Christian Hipp | In the second line of exercise 14.9 "performs" should be "perform". |
| 888 | Jiaxuan Lin | Equation 15.1 could be written more clearly in terms of p'. |
| 894 | Mike Day | In the second line of the third paragraph, "returns resulting" should be "returns the resulting", and the following "and" should be "or". |
| 899 | Jiayin Cao | Given pbrt's angle conventions, the denominator of the squared term in the displayed math should be "1 + g - 2 g \xi$ and the entire RHS should be negated. In turn, the negation of "cosTheta" at the end of Sample_p should be removed as well as the negation of "wo" at the end of the last code fragment on the page. |
| 899 | Mike Day | In the first line of the third paragraph, "the angles" should be deleted. |
| 905 | Zejian Wang (王 泽健) | In the 5th paragraph, an opening parenthesis is missing before 1 - F_t(\cos \theta)). (More generally, it might make sense to remove the closing parenthesis and then both opening and closing parenthesis in the earlier expression of the same form.) |
| 906 | Christian Hipp | In line 6 of the 3rd paragraph, "much a simpler" should be "a much simpler". |
| 907 | Per Christensen | In the first line of the last paragraph, "a different a sampling" should be "a different sampling". |
| 913 | Christian Hipp | In line 5 of the 2nd paragraph in Section 15.4.2, "for to the given" should be "for the given". |
| 919 | Steve Hill | The light distribution plots shown actually correspond to 5, 10, and 100 scattering events, respectively. |
| 904 | Mike Day | Three lines from the bottom, "surface intersection" should be "surface interaction". |
| 905 | Zejian Wang (王 泽健) | In Equation 15.47, the last \cos \theta_o term should be its absolute value. |
| 912 | Mike Day | In the second line of the third paragraph, "p_o - p_i" should be "p_i - p_o". The same change should be made to the first line of code in the fragment below. |
| 922 | Mike Day | In the second paragraph, "is the divergence operator" should be "is the divergence of E(p)". |
| 933 | Mike Day | In the second line of the 5th paragraph, "according to exponential distribution" should be "according to an exponential distribution". |
| 938 | Per Christensen | In the third line of the 6th paragraph, the second sigma_s should be sigma_a. Further, it might be more clear to rewrite to just multiply by sigma_t rather than dividing by sigma_t^{-1}. |
| 944 | Per Christensen | In the second line of Exercise 15.4, "this more effective" should be "this is more effective". |
| 944 | Christian Hipp | In line 4 of exercise 15.5, "often be sampled" should be "more often be sampled". |
| 947 | Christian Hipp | In the 6th line of the 2nd paragraph, "photons have" should be "photons that have". |
| 949 | Per Christensen | In the first and second lines of the last paragraph, "value of importance function" should be "value of the importance function". |
| 949 | Mike Day | In the 5th line of the 5th paragraph, "point on the camera p" would read better as "point p on the camera". |
| 950 | Mike Day | In the 4th line of the second paragraph, "angles between them" should be "angle between them". |
| 951 | Christian Hipp | In the first line of the first paragraph, "a ideal sensor" should be "an ideal sensor". |
| 953 | Mike Day | In second line of the first paragraph, "point camera" should be "a pinhole camera". |
| 954 | Michael Mara | In the first line of the 5th paragraph, "Sample_We()" should be "Sample_Wi()". |
| 961 | 熊伟 | In the 4th line of the first paragraph "below" should be "above". |
| 964 | Per Christensen | In the art for Figure 16.5, the alphas should be betas. |
| 969 | Jinfeng Guo | In the text right before Equation (16.11), "\omega" should be "\omega_o". |
| 979 | Jinfeng Guo | In the second line of the first paragraph, "path" should be "pass". |
| 971 | Per Christensen | In the third line of the second to last paragraph, "photons that are found" should be "photons are found". |
| 972 | Per Christensen | In the 5th line of the third paragraph, the limit for r should be "r \rightarrow 0". |
| 974 | Mike Day | In 6th line of the second paragraph, "photons have" should be "photons that have". |
| 975 | Mike Day | In first line of the first paragraph, "increasingly sharper" should be "increasingly sharp". |
| 984 | Mike Day | At the end of the first paragraph, "since a 32-bit int would overflow after roughly 2" should be "since an unsigned 32-bit integer would overflow after roughly 4 billion". |
| 988 | Per Christensen | In the second line of the third paragraph, insert "a" before "distribution of photons". |
| 991 | Jinfeng Guo, Wei-Feng Huang | In the second line after the displayed math at the middle of the page, q_{s'} should be q_{s'-1} and p_{t'} should be p_{t'-1}. |
| 996 | Mike Day | In the first line of the last paragraph, "a multiple constructors" should be "multiple constructors". |
| 1005 | Wei-Feng Huang | In fourth line of the second paragraph, "pdfFwd" should be "pdf". |
| 1008 | Christian Hipp | In the 2nd line of the first paragraph, "soid" should be "solid" |
| 1011 | Wei-Feng Huang | In fifth line of the first paragraph, T(\bar{p}_t) should have a \hat{} over the T. |
| 1011 | Wei-Feng Huang | In second line after the second displayed equation "camera path" and "light path" should be exchanged. |
| 1020 | Christian Hipp | In the 2nd line of the 5th paragraph, "a infinite" should be "an infinite". |
| 1031 | Wei-Feng Huang | In the first line of the first paragraph, "MLTIntegrator" should be "MLTSampler". |
| 1044 | Per Christensen | A better reference for Lafortune and Willems (1994) would be "Lafortune, E. and Y. Willems, Bi-directional path tracing. 1993. Proceedings of Compugraphics 1993. 145--53." |
| 829 | Per Christensen | In the last line of the page, "contaminated surfaces" should be "surfaces covered". |
| 1052 | Jim Price | In the second line of the first bullet at the bottom of the page, "word" should be "world". |
| 1053 | Jim Price | In the first sentence of section 17.1.2, the word "of" is repeated twice in a row. |
| 1058 | Per Christensen | In paragraph four, Christensen et al (2006) "Ray tracing for the movie Cars" should be cited for the idea of testing a ray against four bounding boxes using SSE instructions. |
| 1068 | Jonathon Cai | In the third line on the page, "totalResolution" should be "(totalResolution.x, totalResolution.y)". |
| 1074 | Christian Hipp | In the 2nd line of the footnote, "substantially times slower" should be "substantially slower". |
| 1084 | Per Christensen | In the very last line of the page, "newMax" should be "localMax". |
| 1085 | Kostya Smolenskiy | In the third line of text, "vaxValue" should be "maxValue". |
| 1085 | Christian Hipp | In the last line of the last paragraph, "not necessarily not equal" should be "not necessarily equal". |
| 1085 | Marc Palmans | At the very bottom, "commutative" should be "associative". |
| 1086 | Mike Day | In the first paragraph, "commutative" should be "associative". |
| 1170 | Matt Pharr | A closing parenthesis should be added after "Proceedings" in the Christensen et al. 2003 citation. |
| 1203 | Hualin Xu | For the Stephenson reference, "2006" should be "2007". |
| 1208 | Matt Pharr | The Whitted citation is not in the correct alphabetical order. |
| 1223 | Jeremy Cowles | The index should have an entry for "Nyquist frequency", which is defined on page 410. |