<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Segoe UI";
panose-1:2 11 5 2 4 2 4 2 2 3;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Thank You Michalis and Holger, </p><p class=MsoNormal>Joe</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328;background:#FFEBE9'>Unable to render code block<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328;background:#FFEBE9'>Is a message I got when looking at the pdf titania article.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328;background:#FFEBE9'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328;background:#FFEBE9'><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:michalis.kambi@gmail.com">Michalis Kamburelis</a><br><b>Sent: </b>Tuesday, July 25, 2023 3:04 AM<br><b>To: </b><a href="mailto:joedwil@earthlink.net">Joseph D Williams</a><br><b>Cc: </b><a href="mailto:x3d-public@web3d.org">X3D Graphics public mailing list</a><br><b>Subject: </b>Re: [x3d-public] SLERP or LERP</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>"HAnimJoint.rotation" is SFRotation, and the only interpolators in X3D standard</p><p class=MsoNormal>to animate SFRotation are</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>1. OrientationInterpolator . This indeed does SLerp.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> Supported by pretty much all X3D browsers, used by a lot X3D</p><p class=MsoNormal>models to animate any rotations, also for "Transform.rotation".</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>2. SquadOrientationInterpolator. This does SQUAD interpolation.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> Less often used and implemented, from what I see. I actually</p><p class=MsoNormal>never saw a real-life (not testcase) model using</p><p class=MsoNormal>SquadOrientationInterpolator, and I don't know who supports it</p><p class=MsoNormal>(CGE/view3dscene do not).</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Both of those interpolators can be used to animate any SFRotation,</p><p class=MsoNormal>including "HAnimJoint.rotation" or "Transform.rotation".</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,</p><p class=MsoNormal>Michalis</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>wt., 25 lip 2023 o 07:43 Joseph D Williams <joedwil@earthlink.net> napisał(a):</p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>> 19.4.6 OrientationInterpolator</p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>> … 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. …</p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>> So to me that means we are SLERP’n.</p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>> Joe</p><p class=MsoNormal>><o:p> </o:p></p><p class=MsoNormal>> _______________________________________________</p><p class=MsoNormal>> x3d-public mailing list</p><p class=MsoNormal>> x3d-public@web3d.org</p><p class=MsoNormal>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>