Hi guys, FYI, I've been working on a quaternion-related class named QuaternionRotation for commons-geometry (see link below). It includes slerp as well as several other geometry-oriented methods, such as conversion to/from axis-angle representations and creation from basis rotations. It's not quite ready for a merge yet since I still need to finish the Euler angle conversions.
I did not use the Quaternion class from commons-numbers since I wanted to focus solely on using quaternions to represent 3D rotations. I felt like the commons-numbers class was too general for this. Regards, Matt https://github.com/darkma773r/commons-geometry/blob/transforms/commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/threed/QuaternionRotation.java [https://avatars1.githubusercontent.com/u/3809623?s=400&v=4]<https://github.com/darkma773r/commons-geometry/blob/transforms/commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/threed/QuaternionRotation.java> darkma773r/commons-geometry<https://github.com/darkma773r/commons-geometry/blob/transforms/commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/threed/QuaternionRotation.java> Apache Commons Geometry. Contribute to darkma773r/commons-geometry development by creating an account on GitHub. github.com ________________________________ From: Gilles <gil...@harfang.homelinux.org> Sent: Friday, November 30, 2018 9:37 AM To: dev@commons.apache.org Subject: Re: [numbers] Making Quaternion a VALJO On Fri, 30 Nov 2018 14:22:45 +0000, Steve Bosman wrote: >> > and I have also emailed an ICLA. > >> Not received/acknowledged yet. > > I am now listed on the "Persons with signed CLAs but who are not > (yet) > committers." page. Welcome! >> > I think two convenience divide methods performing qr^{-1} and >> r^{-1}q >> > for q >> > and r would be useful, but I couldn't think of nice names for >> them. > >> What are the use-cases? >> Why aren't "multiply" and "inverse" enough? > > I must admit I'm new to quaternions and stumbled into the project > while > trying to improve my understanding so I'm not going to claim great > knowledge of how common these operations are. I was primarily > thinking of > Quaternion Interpolation - SLERP and SQUAD. It seems to me that you > end up > creating inverse instances and throwing them away a lot and I thought > it > would be good to reduce that overhead. Surely, the class "Quaternion" is minimal but, before adding to the API, we be careful to have use-cases for low-level operations. Those mentioned above seems more high-level, tied to a specific domain (see also "Commons Geometry", another new component not yet released) but I may be wrong... Regards, Gilles > > Steve --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
