<div dir="auto">Okay, Joe, I thought you were talking about some kind of lerp.</div><div dir="auto"><br></div><div dir="auto">John </div><div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Feb 10, 2025 at 11:58 AM Joe D Williams via x3d-public <<a href="mailto:x3d-public@web3d.org">x3d-public@web3d.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:12pt"><p style="margin:0.1rem 0;line-height:1.0">not zerp, zero</p>
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<p>-----Original Message-----<br>From: Extensible 3D (X3D) Graphics public discussion <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>><br>Sent: Feb 10, 2025 9:50 AM<br>To: Extensible 3D (X3D) Graphics public discussion <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>>, X3D Graphics public mailing list <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>><br>Cc: Joe D Williams <<a href="mailto:joedwil@earthlink.net" target="_blank">joedwil@earthlink.net</a>>, Andreas Plesch <<a href="mailto:andreasplesch@gmail.com" target="_blank">andreasplesch@gmail.com</a>><br>Subject: Re: [x3d-public] SFRotation default value spec. inconsistency</p>
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<p style="margin:0.1rem 0;line-height:1.0">I think the 0 0 1 0 should be used everywhere for default axis-angle. </p>
<p style="margin:0.1rem 0;line-height:1.0">I thinkI see 'zerp' unit quaternions (as in gltf as 0 0 0 1 XYZW) </p>
<p style="margin:0.1rem 0;line-height:1.0">Thanks,</p>
<p style="margin:0.1rem 0;line-height:1.0">Joe</p>
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<p>-----Original Message-----<br>From: Extensible 3D (X3D) Graphics public discussion <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>><br>Sent: Feb 10, 2025 8:44 AM<br>To: X3D Graphics public mailing list <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>><br>Cc: Andreas Plesch <<a href="mailto:andreasplesch@gmail.com" target="_blank">andreasplesch@gmail.com</a>><br>Subject: Re: [x3d-public] SFRotation default value spec. inconsistency</p>
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<div>The JS SAI spec. at <a href="https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#FieldServices" target="_blank">https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#FieldServices</a></div>
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<div>does not list functions for SFColorRGBA, only SFColor. There may be an earlier report. -Andreas</div>
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<div class="gmail_attr" dir="ltr">On Mon, Feb 10, 2025 at 11:31 AM Andreas Plesch <<a href="mailto:andreasplesch@gmail.com" target="_blank">andreasplesch@gmail.com</a>> wrote:</div>
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<div><a href="https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/fieldTypes.html#SFRotationAndMFRotation" rel="noopener" target="_blank">https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/fieldTypes.html#SFRotationAndMFRotation</a></div>
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<div>specifies that (0 0 1 0) is the value of an uninitialized SFRotation given as (x y z a).</div>
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<div>However, the JS SAI spec. in table 7.18 in <a href="https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#SFRotationInstanceCreationFunction" rel="noopener" target="_blank">https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/functions.html#SFRotationInstanceCreationFunction</a></div>
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<div>effectively makes (0 1 0 0) the default value if no parameters are provided.</div>
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<div>The inconsistency does not have much of an impact since both are 0 rotations but I believe (0 1 0 0) - a 0 rotation around y - may have been intended as the default.</div>
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<div>-Andreas</div>
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<div>Andreas Plesch<br>Waltham, MA 02453</div>
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<div>Andreas Plesch<br>Waltham, MA 02453</div>
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