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--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo1'>So maybe something that goes -1 (backwards),</li></ul><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Something, but not this thing or else needs to change the name. What is the word for the reverse of an emitter? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><h2 style='margin-top:13.5pt'><span style='font-size:15.5pt;font-family:"Verdana",sans-serif;color:black'>40.4.5 ParticleSystem<o:p></o:p></span></h2></div><p class=MsoNormal><o:p> </o:p></p><div><div><pre style='margin-left:18.75pt'><span style='font-family:"Calibri",sans-serif'>Contains this field called </span><span style='font-size:8.5pt;color:black'>createParticles and another named enabled<o:p></o:p></span></pre></div><pre style='margin-left:18.75pt'><span style='font-size:8.5pt;color:black'><o:p> </o:p></span></pre></div><p class=MsoNormal>createP starts and stops and operates not like an enabled, which would kill all rather than just stop new. I think all the rest of controls are in there. If e/d moved upto <i><span style='font-size:12.0pt;font-family:"Verdana",sans-serif;color:black;background:white'>X3DParticleEmitterNode</span></i> then also move cP <span style='font-size:8.5pt;color:black'>unless, and why not, allow emitter</span><o:p></o:p></p><div><pre style='margin-left:18.75pt'><span style='font-size:8.5pt;color:black'> to be an MF then add e/d amd cP for each emitter</span><span style='font-size:8.5pt;font-family:"Segoe UI Emoji",sans-serif;color:black'>😊</span><span style='font-size:8.5pt;color:black'><o:p></o:p></span></pre></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Fun and Lock,<o:p></o:p></p><p class=MsoNormal>Joe<o:p></o:p></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:yottzumm@gmail.com">John Carlson</a><br><b>Sent: </b>Friday, February 11, 2022 1:19 PM<br><b>To: </b><a href="mailto:brutzman@nps.edu">Brutzman, Donald (Don) (CIV)</a><br><b>Cc: </b><a href="mailto:x3d-public@web3d.org">X3D Public Mailing List (x3d-public@web3d.org)</a><br><b>Subject: </b>Re: [x3d-public] X3D minutes 11 FEB 2022: ,X3D4 Particle Systems component review,adding enabled field to X3DParticleEmitterNode ?</p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>It also might be good to enable a kind of slo-mo effect, if not already handled. Also an emitter going in reverse.</p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>So maybe something that goes -1 (backwards), 0 (disabled), 1 (enabled), and various slo-mo settings in-between. This would be a weighted factor on speed, where speed provides the maximum speed without the slo-mo setting.</p></div><div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Fri, Feb 11, 2022 at 12:54 PM John Carlson <<a href="mailto:yottzumm@gmail.com">yottzumm@gmail.com</a>> wrote:</p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><p class=MsoNormal style='margin-left:9.6pt'>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?</p></div><div><p class=MsoNormal style='margin-left:9.6pt'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:9.6pt'>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.</p></div><div><p class=MsoNormal style='margin-left:9.6pt'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:9.6pt'>I’m not sure if full on/full off matches physical reality. I can think of examples like bombs, volcanoes and dropping things though.</p></div><div><p class=MsoNormal style='margin-left:9.6pt'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:9.6pt'>A combination of min/max speed and on/off would cover the cases I’m thinking of.</p></div><div><p class=MsoNormal style='margin-left:9.6pt'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:9.6pt'>John </p></div><div><p class=MsoNormal style='margin-left:9.6pt'><o:p> </o:p></p><div><div><p class=MsoNormal style='margin-left:9.6pt'>On Fri, Feb 11, 2022 at 12:36 PM Brutzman, Donald (Don) (CIV) <<a href="mailto:brutzman@nps.edu" target="_blank">brutzman@nps.edu</a>> wrote:</p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>Tweeted:</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l5 level1 lfo2'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>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?</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l5 level1 lfo2'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><a href="https://twitter.com/Web3DConsortium/status/1492205445120815105" target="_blank">https://twitter.com/Web3DConsortium/status/1492205445120815105</a></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>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.</p></div></div><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'> </span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>all the best, Don</span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>-- </span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>Don Brutzman Naval Postgraduate School, Code USW/Br <a href="mailto:brutzman@nps.edu" target="_blank">brutzman@nps.edu</a></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149</span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>X3D graphics, virtual worlds, Navy robotics https://</span> <span style='font-size:10.0pt;font-family:"Courier New"'><a href="http://faculty.nps.edu/brutzman" target="_blank">faculty.nps.edu/brutzman</a></span></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><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 ?</p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>Attendees: Anita Havele, Vince Marchetti, Dick Puk, Don Brutzman. Regrets: Nicholas Polys, John Carlson.</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l1 level1 lfo3'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>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.</p><p style='margin-left:.25in'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l3 level1 lfo4'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>X3D4 Architecture, clause 37 Particle Systems component</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l3 level1 lfo4'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><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> </p><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>a. Improved issue notes, WindPhysicsModel:</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l4 level1 lfo5'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Mantis <span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;background:#F3F3F3'>464: 40.4.10 WindPhysicsModel - Question on Speed</span> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l4 level1 lfo5'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><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></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l4 level1 lfo5'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Related issue: Mantis 768. Deferred to X3D 4.1</p><p> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;background:#F3F3F3'>Likely pressure equation for future use will be based on difference between particle speed and wind speed.</span><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'><br clear=all><br clear=all><span style='background:#F3F3F3'>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></p><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p></div><p style='margin-left:.75in'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>b. New deficiency noted: how do you turn off an emitter node?</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>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.</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>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. </p><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l2 level1 lfo6'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Mantis 1380: ability to disable/enable X3DParticleEmitterNode </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:55.2pt;text-indent:-.25in;mso-list:l2 level1 lfo6'><![if !supportLists]><span style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><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></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'><br>Authors are unable to easily turn particle emitter nodes on or off.<br clear=all><br clear=all>X3DParticleEmitterNode (and implementing nodes) need field:<br clear=all><br clear=all> SFBool [in out] enabled TRUE<br clear=all><br clear=all>Implementation is simple for browsers. This field has no impact on legacy content.<br clear=all><br clear=all>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.</span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'> </span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>Of related note: X3DParticlePhysicsModelNode in this component does include an enabled field, for identical purposes.</span></p><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>Vince discussed his Browser Review document noting X3D support, we hope to look at this draft further next week.</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>No member-only information included on this page.</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'>Hope everybody has another great week. Have fun with X3D!</p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'> </span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>all the best, Don</span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>-- </span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>Don Brutzman Naval Postgraduate School, Code USW/Br <a href="mailto:brutzman@nps.edu" target="_blank">brutzman@nps.edu</a></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149</span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'><span style='font-size:10.0pt;font-family:"Courier New"'>X3D graphics, virtual worlds, Navy robotics https://</span> <span style='font-size:10.0pt;font-family:"Courier New"'><a href="http://faculty.nps.edu/brutzman" target="_blank">faculty.nps.edu/brutzman</a></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:19.2pt'> </p></div></div></blockquote></div></div></blockquote></div></div><p class=MsoNormal style='margin-left:9.6pt'>_______________________________________________<br>x3d-public mailing list<br><a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br><a href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org" target="_blank">http://web3d.org/mailman/listinfo/x3d-public_web3d.org</a></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>