[x3d-public] SLERP or LERP

[Holger Seelig]

You can get it also here https://web.mit.edu/2.998/www/QuaternionReport1.pdf

--
Holger Seelig
Leipzig, Germany

holger.seelig at yahoo.de
https://create3000.github.io/x_ite/

> Am 25.07.2023 um 17:21 schrieb Joseph D Williams <joedwil at earthlink.net>:
> 
> Thank You Michalis and Holger, 
> Joe
>  
> Unable to render code block
> Is a message I got when looking at the pdf titania article.
>  
>  
>  
> From: Michalis Kamburelis <mailto:michalis.kambi at gmail.com>
> Sent: Tuesday, July 25, 2023 3:04 AM
> To: Joseph D Williams <mailto:joedwil at earthlink.net>
> Cc: X3D Graphics public mailing list <mailto:x3d-public at web3d.org>
> Subject: Re: [x3d-public] SLERP or LERP
>  
> "HAnimJoint.rotation" is SFRotation, and the only interpolators in X3D standard
> to animate SFRotation are
>  
> 1. OrientationInterpolator . This indeed does SLerp.
>  
>     Supported by pretty much all X3D browsers, used by a lot X3D
> models to animate any rotations, also for "Transform.rotation".
>  
> 2. SquadOrientationInterpolator. This does SQUAD interpolation.
>  
>     Less often used and implemented, from what I see. I actually
> never saw a real-life (not testcase) model using
> SquadOrientationInterpolator, and I don't know who supports it
> (CGE/view3dscene do not).
>  
> Both of those interpolators can be used to animate any SFRotation,
> including "HAnimJoint.rotation" or "Transform.rotation".
>  
> Regards,
> Michalis
>  
>  
>  
>  
> wt., 25 lip 2023 o 07:43 Joseph D Williams <joedwil at earthlink.net> napisał(a):
> > 
> > 19.4.6 OrientationInterpolator
> > 
> > … An OrientationInterpolator interpolates between two orientations by computing the shortest path on the unit sphere between the two orientations. The interpolation is linear in arc length along this path. …
> > 
> > 
> > 
> > So to me that means we are SLERP’n.
> > 
> > 
> > 
> > Joe
> > 
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