[x3d-public] start timer at fraction 0 after scene loading

[Andreas Plesch]

A variation would be for the start timer to self-disable by routing
its cycleTime through event utilities to set its enabled field to
false. This is more verbose but may help a bit with performance since
the browser then does not need to check stopTime against the actual
current time at each tick, for a timer which is never used again.

It would be useful if BooleanFilter would have a triggerFalse field in
addition to its triggerTrue, in order to switch off things. It could
be just added without backward compatibility issues. A BooleanFilter
can invert but it seems arbitrary and unsymmetrical to only have
triggerTrue. I have a sense of Dejavu since event utilities had been
discussed before.

Cheers, Andreas

On Fri, Sep 8, 2023 at 3:18 PM Brutzman, Donald (Don) (CIV)
<brutzman at nps.edu> wrote:
>
> Very interesting, thanks for sharing Andreas.  We should all be thinking of regularizing some example design patterns like animation.
>
>
>
> Meanwhile, your example is the kind that makes me think we should have a description field for ROUTE.
>
>
>
>     <ROUTE fromField='cycleTime' fromNode='TIME1' toField='stopTime' toNode='TIME1'/>
>
>     <ROUTE fromField='cycleTime' fromNode='TIME1' toField='startTime' toNode='TIME2'/>
>
>
>
> Potential alternative approaches for ROUTE comments:
>
>
>
> Comments?  Sure, but sometimes get stripped, and not unambiguously readable by tools.
> Prototype extension?  Too complex and error prone, fuggedaboutit.
> Metadata nodes?  Hmm, we can't make those part of ROUTE statements themselves, not allowed.
>
>
>
> Maybe some clumsy-but-unambiguous convention like the following already-legal X3D fragment:
>
>
>
> <MetadataSet name=”RouteDescriptions” reference=”someWeb3dRecommendedPracticeURL”>
>
>    <MetadataString name=”ROUTE” value=”TIME1.cycleTime TO Time2.startTime”/>
>
>    <MetadataString name=”ROUTE” value=”TIME1.cycleTime TO Time1.stopTime”/>
>
>    <MetadataString name=”description” value=”trigger the other ROUTE, then turn itself off”/>
>
> </MetadataSet>
>
>
>
> Of course simplest future approach would be to give ROUTE a description field.  Hmmm, maybe someday.
>
>
>
> Might deserve a Mantis issue for X3D4.1 if others agree some potential value exists for future consideation.
>
>
>
> 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
>
>
>
> -----Original Message-----
> From: x3d-public <x3d-public-bounces at web3d.org> On Behalf Of Andreas Plesch
> Sent: Thursday, September 7, 2023 1:43 PM
> To: X3D Graphics public mailing list <x3d-public at web3d.org>
> Subject: Re: [x3d-public] start timer at fraction 0 after scene loading
>
>
>
> Here is an initial count down after loading the scene using the same autostart method, and a sequencer:
>
>
>
> https://andreasplesch.github.io/Library/Viewer/dev.html?url=https://gist.githubusercontent.com/andreasplesch/3f7ea30b9860b6399c797c51e3235459/raw/d17f9d2a0a258569ac5a474c36a68208674d535e/countdown.x3d
>
>
>
> https://create3000.github.io/x_ite/playground/?url=https://gist.githubusercontent.com/andreasplesch/3f7ea30b9860b6399c797c51e3235459/raw/d17f9d2a0a258569ac5a474c36a68208674d535e/countdown.x3d
>
>
>
> -Andreas
>
>
>
> On Thu, Sep 7, 2023 at 1:01 AM Andreas Plesch <andreasplesch at gmail.com> wrote:
>
> >
>
> > Another method apart from a ProximitySensor to start a timer without
>
> > user interaction after scene loading is to use two TimeSensors. The
>
> > first has loop=true and its only purpose is to trigger the second by
>
> > routing its cycleTime to the startTime of the second TimeSensor. The
>
> > first also stops itself by routing its cycleTime to its own stopTime.
>
> >
>
> > Here is an example modified from the cycleTime NIST example:
>
> >
>
> > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Frent
>
> > ry.co%2Fx3d-startTimer&data=05%7C01%7Cbrutzman%40nps.edu%7C4b415083034
>
> > 641d371e608dbafe335ef%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638
>
> > 297162641403741%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2
>
> > luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=v3ah%2F2OY7
>
> > NVzEwTUIhRhBjG%2BNHdMZoJTbsC3lEnHR1I%3D&reserved=0
>
> >
>
> > https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fandr
>
> > easplesch.github.io%2FLibrary%2FViewer%2Fdev.html%3Furl%3Dhttps%3A%2F%
>
> > 2Fgist.githubusercontent.com%2Fandreasplesch%2F3f7ea30b9860b6399c797c5
>
> > 1e3235459%2Fraw%2F118d65438f9cfdc152c01fc5a24a8eccec705511%2FstartTime
>
> > r.x3d&data=05%7C01%7Cbrutzman%40nps.edu%7C4b415083034641d371e608dbafe3
>
> > 35ef%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638297162641403741%7
>
> > CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1
>
> > haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=m8xOnL%2BHHQy5gXlqLQaec6vBIi
>
> > %2BSchjeWtKfYWNDMHw%3D&reserved=0
>
> >
>
> > --
>
> > Andreas Plesch
>
> > Waltham, MA 02453
>
>
>
>
>
>
>
> --
>
> Andreas Plesch
>
> Waltham, MA 02453
>
>
>
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>
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>
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-- 
Andreas Plesch
Waltham, MA 02453