[x3d-public] X3D minutes 11 FEB 2022: , X3D4 Particle Systems component review, adding enabled field to X3DParticleEmitterNode ?

Thu Feb 17 03:44:28 PST 2022

I tried for a while to get something working, using FreeWRL. My best
attempt was a red stationary sphere.  Then I said to myself,
X_ITE/create3000 must have some examples, and sure enough:

https://create3000.github.io/media/examples/ParticleSystems/ParticleSystem/example.html

https://github.com/create3000/Library/tree/main/Tests/Components/ParticleSystems/

I will work on an example based on some of these, but I wanted to give
Holger some credit first!   The first example is pretty awesome!

Enjoy!

On Thu, Feb 17, 2022 at 4:26 AM John Carlson <yottzumm at gmail.com> wrote:

> Okay, I'll try writing one!
>
> Thanks!
>
> John
>
> On Thu, Feb 17, 2022 at 3:48 AM Brutzman, Donald (Don) (CIV) <
> brutzman at nps.edu> wrote:
>
>> John, thanks for looking ahead.  The best way to think through notional
>> use cases is by, ahem, using them – demonstrating with examples.  We do
>> need shared example scenes in our archives for this component.
>>
>>
>>
>> We remain at the editorial stage of final review.  So we are not
>> re-inventing now.
>>
>>
>>
>> When we can clarify the X3D4 specification, we are doing so.  If our
>> current final review leads proposals for future X3D4.1 spec, we add them to
>> Mantis.  Onward we go.
>>
>>
>>
>> all the best, Don
>>
>> --
>>
>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>> brutzman at nps.edu
>>
>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>> +1.831.656.2149
>>
>> X3D graphics, virtual worlds, Navy robotics https://
>> faculty.nps.edu/brutzman
>>
>>
>>
>> *From:* John Carlson <yottzumm at gmail.com>
>> *Sent:* Friday, February 11, 2022 10:55 AM
>> *To:* Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
>> *Cc:* X3D Public Mailing List (x3d-public at web3d.org) <
>> x3d-public at web3d.org>
>> *Subject:* Re: [x3d-public] X3D minutes 11 FEB 2022: , X3D4 Particle
>> Systems component review, adding enabled field to X3DParticleEmitterNode ?
>>
>>
>>
>> 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?
>>
>>
>>
>> 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.
>>
>>
>>
>> I’m not sure if full on/full off matches physical reality.   I can think
>> of examples like bombs, volcanoes and dropping things though.
>>
>>
>>
>> A combination of min/max speed and on/off would cover the cases I’m
>> thinking of.
>>
>>
>>
>> John
>>
>>
>>
>> On Fri, Feb 11, 2022 at 12:36 PM Brutzman, Donald (Don) (CIV) <
>> brutzman at nps.edu> wrote:
>>
>> Tweeted:
>>
>>
>>
>>    - 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?
>>    - https://twitter.com/Web3DConsortium/status/1492205445120815105
>>    <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftwitter.com%2FWeb3DConsortium%2Fstatus%2F1492205445120815105&data=04%7C01%7Cbrutzman%40nps.edu%7Cdf587868e4dc45076d8808d9ed8ff681%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C637805869539926559%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=IyApkG4TB7hbt%2FYIPSGiNjOhs4LpScFDdOr5MDPrrHE%3D&reserved=0>
>>
>>
>>
>> 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.
>>
>>
>>
>> all the best, Don
>>
>> --
>>
>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>> brutzman at nps.edu
>>
>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>> +1.831.656.2149
>>
>> X3D graphics, virtual worlds, Navy robotics https://
>> faculty.nps.edu/brutzman
>>
>>
>>
>> *From:* Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
>> *Sent:* Friday, February 11, 2022 9:28 AM
>> *To:* X3D Public Mailing List (x3d-public at web3d.org) <
>> x3d-public at web3d.org>
>> *Cc:* Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
>> *Subject:* X3D minutes 11 FEB 2022: , X3D4 Particle Systems component
>> review, adding enabled field to X3DParticleEmitterNode ?
>>
>>
>>
>> Attendees: Anita Havele, Vince Marchetti, Dick Puk, Don Brutzman.
>> Regrets: Nicholas Polys, John Carlson.
>>
>>
>>
>>    1. 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.
>>
>>
>>
>>    - X3D4 Architecture, clause 37 Particle Systems component
>>    -
>>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/particleSystems.html
>>
>>
>>
>>
>>
>> a. Improved issue notes, WindPhysicsModel:
>>
>>
>>
>>    - Mantis 464: 40.4.10 WindPhysicsModel - Question on Speed
>>    - https://www.web3d.org/member-only/mantis/view.php?id=464
>>    - Related issue: Mantis 768.  Deferred to X3D 4.1
>>
>>
>>
>> Likely pressure equation for future use will be based on difference
>> between particle speed and wind speed.
>>
>> Note that the turbulence definition (regarding variability of wind
>> direction) also needs improvement. For example, can highly turbulent wind
>> stop or reverse direction?
>>
>>
>>
>>
>>
>> b. New deficiency noted: how do you turn off an emitter node?
>>
>>
>>
>> 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.
>>
>>
>>
>> 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.
>>
>>
>>
>>
>>
>>    - Mantis 1380: ability to disable/enable X3DParticleEmitterNode
>>    - https://www.web3d.org/member-only/mantis/view_all_bug_page.php
>>
>>
>> Authors are unable to easily turn particle emitter nodes on or off.
>>
>> X3DParticleEmitterNode (and implementing nodes) need field:
>>
>>    SFBool [in out] enabled TRUE
>>
>> Implementation is simple for browsers. This field has no impact on legacy
>> content.
>>
>> Current workarounds:
>> * Possibly /speed/ might be zero, but then a particle would still be
>> present and pulsing...
>> * 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.
>>
>>
>>
>> Of related note: X3DParticlePhysicsModelNode in this component does
>> include an enabled field, for identical purposes.
>>
>>
>>
>>
>>
>> Vince discussed his Browser Review document noting X3D support, we hope
>> to look at this draft further next week.
>>
>> No member-only information included on this page.
>>
>>
>>
>> Hope everybody has another great week.  Have fun with X3D!
>>
>>
>>
>> all the best, Don
>>
>> --
>>
>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>> brutzman at nps.edu
>>
>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>> +1.831.656.2149
>>
>> X3D graphics, virtual worlds, Navy robotics https://
>> faculty.nps.edu/brutzman
>>
>>
>>
>> _______________________________________________
>> x3d-public mailing list
>> x3d-public at web3d.org
>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>>
>>
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