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Merge pull request #200 from RayTracing/tdb/if_refract_braces
Tdb/if refract braces
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‎CHANGELOG.md

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Change Log
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================================================================================
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v2.0.0 (2019-09-26)
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---------------------
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Common
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- Add: Created single monolithic raytracing.github.io repo
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- Delete: Deprecated existing _InOneWeekend_, _TheNextWeek_, _TheRestOfYourLife_ repos
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- Change: Moved existing _InOneWeekend_, _TheNextWeek_, _TheRestOfYourLife_ content to io repo
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- Add: CHANGELOG.md
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- Add: CONTRIBUTING.md
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- Add: COPYING.txt
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- Add: README.md
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- Change: License change to CC0 in COPYING.txt
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- Add: raytracing.github.io links to all the three books
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- Change: Web links have been changed to new locations
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- Add: Links to Kindle version of the books
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- Add: CSS for body of the text
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- Add: CSS for images
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- Add: CSS for code blocks
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- Add: CSS for highlighting of text in code blocks
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- Add: CSS for Table of Contents
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- Add: CSS for the print variant of the books
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- Change: All instances of `hitable` have become `hittable`
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- Change: Replaced `drand48()` with portable `random_double` number generation
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- Change: Rewrote vec3.h `cross` function for clarity
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_Ray Tracing In One Weekend_
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- Add: README.md
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- Add: Source README.md
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- Add: Markdeep page created for entire body of text
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- Add: Markdeep MathJax created for formulae and equations for body of text
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- Add: raytracing.github.io/books/RayTracingInOneWeekend.html
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- Change: Text, Chapter 0 Overview has become Chapter 1, all subsequent chapters incremented
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- Change: Text, Syntax highlighting of source modifications
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- Change: Text, Chapter 3, Reorder include files in code blocks to match src conventions
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- Change: Text, Chapter 3, Consistent use of spaces in code blocks
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- Change: Text, Chapter 3, Reordered `vec3` class functions to + - * /
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- Change: Text, Chapter 4, Reorder include files in code blocks to match src conventions
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- Change: Text, Chapter 6, Reorder include files in code blocks to match src conventions
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- Change: Text, Chapter 6, Consistent use of spaces in code blocks
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- Fix: Text, Chapter 7, Add `#include "random.h"` in code blocks
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- Change: Text, Chapter 7, Consistent use of spaces in code blocks
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- Change: Text, Chapter 9, Consistent use of spaces in code blocks
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- Change: Text, Chapter 9, Put function signatures and `{` on the same line
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- Fix: Text, Chapter 10, Added metal fuzziness parameter for initial dielectric
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- Change: Text, Chapter 10, Consistent use of spaces in code blocks
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- Change: Text, Chapter 10, Put function signatures and `{` on the same line
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- Change: Text, Chapter 11, Consistent use of spaces in code blocks
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- Fix: Text, Chapter 13, Added metal fuzziness parameter
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- Change: Text, Chapter 13, Put function signatures and `{` on the same line
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- Delete: Code, `vec3 p = r.point_at_parameter(2.0);` in main.cc
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- Delete: Code, Removed extraneous `;` from `vec3::&operator[]` signature
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_Ray Tracing: The Next Week_
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- Add: README.md
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- Add: Source README.md
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- Add: Markdeep page created for entire body of text
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- Add: Markdeep MathJax created for formulae and equations for body of text
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- Add: raytracing.github.io/books/RayTracingTheNextWeek.html
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- Add: Earth map picture for use in rendering
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- Change: Text, Chapter 0 Overview has become Chapter 1, all subsequent chapters incremented
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- Change: Text, Syntax highlighting of source modifications
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- Fix: Text, Chapter 2, The `lambertian` class definition now uses `vec3` instead of `texture`
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- Change: Text, Chapter 2, Consistent use of spaces in code blocks
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- Change: Text, Chapter 3, Consistent use of spaces in code blocks
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- Change: Text, Chapter 4, Consistent use of spaces in code blocks
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- Change: Text, Chapter 5, Consistent use of spaces in code blocks
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- Change: Text, Chapter 5, added "texture" to "We can use that texture on some spheres"
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- Change: Text, Chapter 7, Consistent use of spaces in code blocks
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- Change: Text, Chapter 7, "This is yz and xz" changed to "This is xz and yz"
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- Fix: Text, Chapter 7, Changed `cornell_box` hittable array size to 5
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- Change: Text, Chapter 8, Changed "And the changes to Cornell is" to "... Cornell are"
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- Change: Text, Chapter 9, Changed short `if` statements to two lines for Consistency
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- Change: Text, Chapter 10, Consistent use of spaces in code blocks
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- Change: Code and Text, Chapter 9, cleaned up implementation of `constant_medium::hit`
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- Change: Code and Text, Chapter 9, Rewrote debug functionality in `constant_medium::hit`
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- Fix: Code and Text, Chapter 3, Changed `List[0]` to `List[i]` in `hittable_list::bounding_box()`
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- Fix: Code and Text, Chapter 3, Replaced `fmax` and `fmin` with `ffmax` and `ffmin`
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- Fix: Code, Add missing headers to constant_medium.h to fix g++ compiler error
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_Ray Tracing: The Rest Of Your Life_
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- Add: README.md
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- Add: Source README.md
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- Add: Markdeep page created for entire body of text
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- Add: Markdeep MathJax created for formulae and equations for body of text
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- Add: raytracing.github.io/books/RayTracingTheRestOfYourLife.html
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- Change: Text, Chapter 0 Overview has become Chapter 1, all subsequent chapters incremented
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- Fix: Text, Chapter order starting from chapter 2
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- Fix: Text, Renamed figures and images to match new chapter numbering
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- Change: Text, Syntax highlighting of source modifications
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- Change: Text, Chapter 2, Reorder include files in code blocks to match src conventions
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- Change: Text, Chapter 3, Reorder include files in code blocks to match src conventions
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- Fix: Text, Chapter 4, Rewrote formula for "Color" to "Color = A * color(direction"
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- Change: Text, Chapter 6, Consistent use of spaces in code blocks
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- Change: Text, Chapter 6, Consistent use of spaces in code blocks
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- Change: Text, Chapter 8, Changed calculation of `a` axis to pseudocode
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- Change: Text, Chapter 8, Consistent use of spaces in code blocks
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- Fix: Code and Text, Chapter 6, `material::scattering_pdf` now returns type float
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- Fix: Code and Text, Chapter 6, removal of factor of 2 to `random_cosine_direction` calculation
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v1.123.0 (2018-08-26)
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-----------------------
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- First GitHub release of _Ray Tracing: The Rest Of Your Life_, bundled with source code.
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_Ray Tracing: The Rest Of Your Life_
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- Add: First GitHub release.
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v1.54.0 (2018-08-26)
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----------------------
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- First GitHub release of _Ray Tracing In One Weekend_, bundled with source code.
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_Ray Tracing In One Weekend_
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- Add: First GitHub release.
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v1.42.0 (2018-08-26)
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----------------------
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- First GitHub release of _Ray Tracing: The Next Week_, bundled with source code.
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_Ray Tracing: The Next Week_
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- Add: First GitHub release.

‎books/RayTracingInOneWeekend.html

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ni_over_nt = 1.0 / ref_idx;
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}
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if (refract(r_in.direction(), outward_normal, ni_over_nt, refracted))
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if (refract(r_in.direction(), outward_normal, ni_over_nt, refracted)) {
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scattered = ray(rec.p, refracted);
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}
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else {
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scattered = ray(rec.p, reflected);
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return false;

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