# The Ray Tracer Challenge: various errata

**URL:** <https://forum.devtalk.com/t/the-ray-tracer-challenge-various-errata/3554>\
**Category:** PragProg Customers\
**Tags:** book-the-ray-tracer-challenge, errata\
**Created:** [29 October 2020 18:48 UTC](https://forum.devtalk.com/t/the-ray-tracer-challenge-various-errata/3554 "2020-10-29T18:48:00Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![PetroCoder](https://forum.devtalk.com/user_avatar/forum.devtalk.com/petrocoder/32/2844_2.png) [@PetroCoder](https://forum.devtalk.com/u/PetroCoder)\
**Post date:** [25 May 2021 09:44 UTC](https://forum.devtalk.com/t/the-ray-tracer-challenge-various-errata/3554/4 "2021-05-25T09:44:21Z")

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Hi Jamis,

Thank you for this explanation. It makes perfect sense. In my code, I am also checking (just in case) that all parameters of the intersection are “consistent”, i.e. that there is indeed an intersection with the object at a given value of `t`. That is why I have spotted this case.

Kind regards,  
Petro

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