# Arcball Library error

**URL:** <https://discourse.processing.org/t/arcball-library-error/17292>\
**Category:** Libraries\
**Created:** [January 23, 2020, 7:12pm UTC](https://discourse.processing.org/t/arcball-library-error/17292 "2020-01-23T19:12:35Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![paulstgeorge](https://avatars.discourse-cdn.com/v4/letter/p/53a042/32.png) [@paulstgeorge](https://discourse.processing.org/u/paulstgeorge)\
**Post date:** [January 24, 2020, 11:15am UTC](https://discourse.processing.org/t/arcball-library-error/17292/4 "2020-01-24T11:15:50Z")

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> [@GoToLoop](#):
>
> simply make the necessary modifications

😉

Thank you both. I am actually trying to make a virtual trackball without using a Library. See [Gimbals, quaternions, and manual rotation](https://discourse.processing.org/t/gimbals-quaternions-and-manual-rotation/17065)

I am almost there and just wanted to look at Arcball to see what might be useful.

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_[View the full topic](https://discourse.processing.org/t/arcball-library-error/17292)._