<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>There is a paper about quaternion interpolation:</div><div><br></div><a href="https://github.com/create3000/titania/blob/master/Papers/Quaternion/Animating Rotations 98-5.pdf">https://github.com/create3000/titania/blob/master/Papers/Quaternion/Animating Rotations 98-5.pdf</a><div><br><div>
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<div><br><blockquote type="cite"><div>Am 25.07.2023 um 12:04 schrieb Michalis Kamburelis <michalis.kambi@gmail.com>:</div><br class="Apple-interchange-newline"><div><div>"HAnimJoint.rotation" is SFRotation, and the only interpolators in X3D standard<br>to animate SFRotation are<br><br>1. OrientationInterpolator . This indeed does SLerp.<br><br> Supported by pretty much all X3D browsers, used by a lot X3D<br>models to animate any rotations, also for "Transform.rotation".<br><br>2. SquadOrientationInterpolator. This does SQUAD interpolation.<br><br> Less often used and implemented, from what I see. I actually<br>never saw a real-life (not testcase) model using<br>SquadOrientationInterpolator, and I don't know who supports it<br>(CGE/view3dscene do not).<br><br>Both of those interpolators can be used to animate any SFRotation,<br>including "HAnimJoint.rotation" or "Transform.rotation".<br><br>Regards,<br>Michalis<br><br><br><br><br>wt., 25 lip 2023 o 07:43 Joseph D Williams <joedwil@earthlink.net> napisał(a):<br><blockquote type="cite"><br>19.4.6 OrientationInterpolator<br><br>… 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. …<br><br><br><br>So to me that means we are SLERP’n.<br><br><br><br>Joe<br><br>_______________________________________________<br>x3d-public mailing list<br>x3d-public@web3d.org<br>http://web3d.org/mailman/listinfo/x3d-public_web3d.org<br></blockquote><br>_______________________________________________<br>x3d-public mailing list<br>x3d-public@web3d.org<br>http://web3d.org/mailman/listinfo/x3d-public_web3d.org<br></div></div></blockquote></div><br></div></body></html>