<div dir="auto">I think it would be better to offer a transition from enabled to disabled and back. But perhaps that’s max speed and min speed?</div><div dir="auto"><br></div><div dir="auto">But I agree that enabled is a good start, and adding a field for full on and full off with no transition is a good idea. One might think of scenes where a door is shut.</div><div dir="auto"><br></div><div dir="auto">I’m not sure if full on/full off matches physical reality. I can think of examples like bombs, volcanoes and dropping things though.</div><div dir="auto"><br></div><div dir="auto">A combination of min/max speed and on/off would cover the cases I’m thinking of.</div><div dir="auto"><br></div><div dir="auto">John </div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 11, 2022 at 12:36 PM Brutzman, Donald (Don) (CIV) <<a href="mailto:brutzman@nps.edu">brutzman@nps.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
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<p class="MsoNormal">Tweeted:<u></u><u></u></p>
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<li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in">X3D meeting minutes 11 FEB 2022: #X3D4 Architecture Particle Systems component review. Community question: is it OK to add 'enabled' field to all emitter nodes, providing simpler
animation control by authors and end users?<u></u><u></u></li><li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in"><a href="https://twitter.com/Web3DConsortium/status/1492205445120815105" target="_blank">https://twitter.com/Web3DConsortium/status/1492205445120815105</a><u></u><u></u></li></ul>
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<p class="MsoNormal">Request: if anyone has links or screenshots of Particle System models in X3D4, we are happy to share them publicly. Thanks in advance for all posts.<u></u><u></u></p></div></div><div lang="EN-US" link="#0563C1" vlink="#954F72" style="word-wrap:break-word"><div class="m_-679412728160726791WordSection1">
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<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">all the best, Don<u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Don Brutzman Naval Postgraduate School, Code USW/Br <a href="mailto:brutzman@nps.edu" target="_blank" style="font-family:"Courier New"">brutzman@nps.edu</a><u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">X3D graphics, virtual worlds, Navy robotics https://</span>
<span style="font-size:10pt;font-family:"Courier New""><a href="http://faculty.nps.edu/brutzman" target="_blank" style="font-family:"Courier New"">faculty.nps.edu/brutzman</a><u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
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<p class="MsoNormal"><b>From:</b> Brutzman, Donald (Don) (CIV) <<a href="mailto:brutzman@nps.edu" target="_blank">brutzman@nps.edu</a>>
<br>
<b>Sent:</b> Friday, February 11, 2022 9:28 AM<br>
<b>To:</b> X3D Public Mailing List (<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>) <<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a>><br>
<b>Cc:</b> Brutzman, Donald (Don) (CIV) <<a href="mailto:brutzman@nps.edu" target="_blank">brutzman@nps.edu</a>><br>
<b>Subject:</b> X3D minutes 11 FEB 2022: , X3D4 Particle Systems component review, adding enabled field to X3DParticleEmitterNode ?<u></u><u></u></p>
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<p class="MsoNormal">Attendees: Anita Havele, Vince Marchetti, Dick Puk, Don Brutzman. Regrets: Nicholas Polys, John Carlson.<u></u><u></u></p>
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<li class="m_-679412728160726791MsoListParagraph">Completed X3D4 Particle Systems component review. All Mantis issues updated and resolved. Latest modifications highlighted via CSS with corresponding Mantis issues documented
using /title/ attributes.<u></u><u></u></li></ol>
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<li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in">X3D4 Architecture, clause 37 Particle Systems component<u></u><u></u></li><li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in"><a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/particleSystems.html" target="_blank">https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/particleSystems.html</a>
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<p class="MsoNormal">a. Improved issue notes, WindPhysicsModel:<u></u><u></u></p>
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<li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in">Mantis
<span style="font-size:10pt;font-family:Verdana,sans-serif;background-color:rgb(243,243,243);color:black">
464: 40.4.10 WindPhysicsModel - Question on Speed</span> <u></u><u></u></li><li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in"><a href="https://www.web3d.org/member-only/mantis/view.php?id=464" target="_blank">https://www.web3d.org/member-only/mantis/view.php?id=464</a><u></u><u></u></li><li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in">Related issue: Mantis 768. Deferred to X3D 4.1<u></u><u></u></li></ul>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif;background-color:rgb(243,243,243);color:black">Likely pressure equation for future use will be based on difference between particle speed and wind speed.</span><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"><br clear="all">
<br clear="all">
<span style="font-family:Verdana,sans-serif;background-color:rgb(243,243,243)">Note that the turbulence definition (regarding variability of wind direction) also needs improvement. For example, can highly turbulent wind stop or reverse direction?</span></span><u></u><u></u></p>
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<p class="MsoNormal">b. New deficiency noted: how do you turn off an emitter node?<u></u><u></u></p>
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<p class="MsoNormal">No /enabled/ field is present. Possibly /speed/ might be zero, but then particle geometry would still be present and perhaps pulsing... Possibly a Switch node might hide it, but then the browser writer likely just turns it off anyway
to save computational resources, which is functionally equivalent to enabled FALSE.<u></u><u></u></p>
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<p class="MsoNormal">We discussed in some depth… Have raises an issue in Mantis, here posted publicly. We seek comment, and decide (hopefully next week) whether it is something to be accomplished in X3D 4.0 or else deferred to X3D 4.1.
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<li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in">Mantis 1380: ability to disable/enable X3DParticleEmitterNode
<u></u><u></u></li><li class="m_-679412728160726791MsoListParagraph" style="margin-left:0in"><a href="https://www.web3d.org/member-only/mantis/view_all_bug_page.php" target="_blank">https://www.web3d.org/member-only/mantis/view_all_bug_page.php</a><u></u><u></u></li></ul>
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Authors are unable to easily turn particle emitter nodes on or off.<br clear="all">
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X3DParticleEmitterNode (and implementing nodes) need field:<br clear="all">
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SFBool [in out] enabled TRUE<br clear="all">
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Implementation is simple for browsers. This field has no impact on legacy content.<br clear="all">
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Current workarounds:<br clear="all">
* Possibly /speed/ might be zero, but then a particle would still be present and pulsing...<br clear="all">
* Possibly a Switch node might hide the emitter, but then the browser writer likely turns it off anyway to save computational resources, which is functionally equivalent to enabled FALSE.<u style="font-family:Verdana,sans-serif"></u><u style="font-family:Verdana,sans-serif"></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"><u style="font-family:Verdana,sans-serif"></u> <u style="font-family:Verdana,sans-serif"></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black">Of related note: X3DParticlePhysicsModelNode in this component does include an enabled field, for identical purposes.<u style="font-family:Verdana,sans-serif"></u><u style="font-family:Verdana,sans-serif"></u></span></p>
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<p class="MsoNormal">Vince discussed his Browser Review document noting X3D support, we hope to look at this draft further next week.<u></u><u></u></p>
<p class="MsoNormal">No member-only information included on this page.<u></u><u></u></p>
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<p class="MsoNormal">Hope everybody has another great week. Have fun with X3D!<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">all the best, Don<u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-- <u style="font-family:"Courier New""></u>
<u style="font-family:"Courier New""></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Don Brutzman Naval Postgraduate School, Code USW/Br
<a href="mailto:brutzman@nps.edu" target="_blank" style="font-family:"Courier New"">brutzman@nps.edu</a><u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">X3D graphics, virtual worlds, Navy robotics https://</span>
<span style="font-size:10pt;font-family:"Courier New""><a href="http://faculty.nps.edu/brutzman" target="_blank" style="font-family:"Courier New"">faculty.nps.edu/brutzman</a><u style="font-family:"Courier New""></u><u style="font-family:"Courier New""></u></span></p>
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