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Doug, thanks for your suggestions.</div>
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Regarding MIDI support:</div>
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<div><i>X3D 4.0 Architecture, 16 Sound component, 16.4.2 AudioClip</i></div>
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<div class="elementToProof">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/sound.html#AudioClip</div>
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<div class="elementToProof">The <i>url</i> field specifies the URL from which the sound file is loaded.
<a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/sound.html#AudioEncodingFormats" id="OWA88ae14fa-0581-d2ab-8378-6bc857869763" class="OWAAutoLink" style="text-align: left;">
16.2.6 Audio encoding formats</a> describes required and recommended file format support.
<a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/networking.html#URLs" id="OWAcd81bbf8-954a-f2dc-ae88-fe26a72bcd44" class="OWAAutoLink" style="text-align: left;">
9.2.1 URLs, URNs and URIs</a> contains details on the <i>url</i> field.</div>
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<div><i>X3D 4.0 Architecture, 16 Sound component, 16.2.6 Audio encoding formats</i></div>
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<div class="elementToProof">https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/sound.html#AudioEncodingFormats</div>
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X3D browsers shall support at least the <i>wavefile</i> format in uncompressed PCM format (see
<a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/bibliography.html#WAV" id="OWAc7868c3f-0e3d-6d01-20ff-236db3c45052" class="OWAAutoLink">
[WAV]</a>).</div>
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It is recommended that X3D browsers support the MIDI file type 1 sound format (see
<a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/references.html#MIDI-1" id="OWAfdddbecc-c218-5b30-df03-da97d104a85b" class="OWAAutoLink">
[MIDI 1.0]</a>). MIDI files are presumed to use the General MIDI patch set.<br>
<span style="background-color: rgb(255, 255, 0);">X3D browser support is also recommended for MIDI 2.0</span> (see
<a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/references.html#MIDI-2" id="OWA7fb0ce35-c7ea-ffdb-8818-4be706977df2" class="OWAAutoLink">
[MIDI 2.0]</a> and Web MIDI API (see <a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/references.html#W3C-WebMIDI" id="OWA1f1ef2a9-ea61-8474-1bf0-cbaa380347f7" class="OWAAutoLink">
[W3C-WebMIDI]</a>).</div>
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It is also recommended that X3D browsers support the following formats:</div>
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Format=MP3, container=MP3, compressed (see <a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/references.html#I11172_1" id="OWAfd4b5914-9667-bd02-0420-4a6bf92f99e0" class="OWAAutoLink">
[I11172-1]</a>).</li><li style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0); margin-top: 4px;">
Format=AAC, container=MP4 (see <a href="https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/references.html#14496_14" id="OWA0b1166bd-2d8d-d2b3-2f06-1694f1847f12" class="OWAAutoLink">
[14496-14]</a>).</li></ul>
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Example X3Dscene with MIDI content:</div>
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<div class="elementToProof">X3D Example Archives: X3D4WA, X3D for Web Authors, Chapter 05 Appearance Material Textures, Pixel Texture Snowman</div>
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<div style="margin: 0px;">https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter05AppearanceMaterialTextures/PixelTextureSnowmanIndex.html</div>
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<div class="elementToProof">https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter05AppearanceMaterialTextures/PixelTextureSnowman.x3d</div>
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<div class="elementToProof">https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter05AppearanceMaterialTextures/frosty2.mid</div>
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Regarding MIDI content in ASCII form, it is certainly not disallowed in the X3D specification. Might you please send some references and an example? Perhaps an ASCII plaintext version of frosty2.</div>
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Have fun with X3D and MIDI! 8)</div>
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<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">all the best, Don</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">--</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">Don Brutzman Naval Postgraduate School, Code USW/Br brutzman@nps.edu</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: "Courier New"; font-size: 9pt;">X3D graphics, virtual worlds, navy robotics https://faculty.nps.edu/brutzman</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> x3d-public <x3d-public-bounces@web3d.org> on behalf of GPU Group via x3d-public <x3d-public@web3d.org><br>
<b>Sent:</b> Wednesday, August 21, 2024 3:14 PM<br>
<b>To:</b> Extensible 3D (X3D) Graphics public discussion <x3d-public@web3d.org><br>
<b>Cc:</b> GPU Group <gpugroup@gmail.com><br>
<b>Subject:</b> Re: [x3d-public] Web3D 2024: HAnim Music Animation competition - Win cash prizes!</span>
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<div style="direction: ltr;">MIDI > at least one web3d browser supports MIDI with nodes that give events, which could be used to synchronize HAnim motions to music tones / beats, or vice versa.</div>
<div style="direction: ltr;">Something missing from prior work: a node that holds MIDI directly in ASCII format, for easy tinkering in X3D scene file.</div>
<div style="direction: ltr;">-Doug</div>
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