# Old Project, New Version

**URL:** <https://discourse.processing.org/t/old-project-new-version/20156>\
**Category:** Gallery\
**Created:** [April 25, 2020, 11:59pm UTC](https://discourse.processing.org/t/old-project-new-version/20156 "2020-04-25T23:59:08Z")\
**Posts on this page:** 1\
**Showing post:** 23

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**Author:** ![HackinHarry](https://avatars.discourse-cdn.com/v4/letter/h/3e96dc/32.png) [@HackinHarry](https://discourse.processing.org/u/HackinHarry)\
**Post date:** [May 23, 2020, 10:34pm UTC](https://discourse.processing.org/t/old-project-new-version/20156/23 "2020-05-23T22:34:49Z")

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One thing bugging me and that is that I need to provide a link to [navigationalalgorithms.com](http://navigationalalgorithms.com) . That is where I got the basic point generator. I modified it but started with what Andres Ruiz wrote. Here is the link to the paper. [http://www.mediafire.com/file/pp89of9q9fk4rbi/rotmatricesCoP.zip/file](http://www.mediafire.com/file/pp89of9q9fk4rbi/rotmatricesCoP.zip/file) The title is “Use of Rotation Matrices to Plot a Circle of Equal Altitude” and is inside the zip file.

I’ve read some of his other papers too and I think there could be an efficient way to calculate an intersection using some of the functions I already have.

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