[x3d-public] [consortium] X3D4 materials available, no X3D meeting Friday 7 August 2020

[Andreas Plesch]

Just a quick question on the new Viewpoint "viewAll" field. When true
during initial loading of the scene, it should trigger showing the
complete scene rather than a view from the provided location. This
requires waiting for the complete scene to load before something can
be shown, and somewhat awkward out of sequence processing of the nodes
during loading. So perhaps this case may not be a priority to support.
The field is straightforward to support after initial loading.
What are implementation strategies for the initial stage browsers
started to use ? A scene LoadSensor, or other load event callback ? I
think x3dom would probably use the explicit pose of the viewpoint
during loading, and install an onload event handler which is called
after loading (perhaps removing itself after adjusting the view).
-Andreas

On Thu, Aug 6, 2020 at 5:57 PM Andreas Plesch <andreasplesch at gmail.com> wrote:
>
> Super progress on X3D4. Thanks for sharing.
>
> Summary:
> - Clarify if PgUp/PgDn also triggers co-binding of a Viewpoint
> provided NavigationInfo node. Probably the answer is yes but it is not
> well defined in the spec.
> - Require transitionTime for 'viewAll' induced transitions.
>
> I am looking into adding "easy" features to x3dom. For example, the
> "visible" field should work now in the dev. version (with "render" as
> alias for backward compatibility).
>
> Working on Viewpoints, there is now the option to have automatic
> co-binding of NavigationInfo nodes under a Viewpoint node. While
> implementing I needed to decide how to deal with switching Viewpoints
> by selecting them with PgDn or PgUp:
>
> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-WD2/Part01/behaviours.html#SelectFromMultipleViewpoints
>
> The spec. does not really say if that is equivalent to sending a
> set_bind event to the selected Viewpoint (which would then also bind
> its NavigationInfo node). So is it ?
>
> There is a section on the Viewpoint list:
>
> https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-WD2/Part01/components/navigation.html#ViewpointList
>
> which is more explicit about "binding" a viewpoint when selected from
> a UI list (but not necessarily via PgUp/PgDn). "binding" almost
> certainly is equivalent to sending a "set_bind=true" event. Since
> keyboard navigation is also mentioned in the same paragraph, I will
> operate under the assumption that PgUp/PgDn also triggers co-binding
> of a provided NavigationInfo node. But it would be useful to clarify
> that in the spec.
>
> With regards to the new "viewAll" field I think it would be really
> helpful from a usability standpoint to require that the transition
> from the current view to the scene view is not instantaneous, or needs
> to follow the transitionTime of the currently bound NavigationInfo
> node.
> As it stands, the spec. language just describes the process of how the
> transition occurs, but not its speed.
>
> -Andreas
>
> On Thu, Aug 6, 2020 at 12:26 PM Don Brutzman <brutzman at nps.edu> wrote:
> >
> > We are way busy!  Great set of Web3D webinars this week, also excellent set of ISO meetings are ongoing.
> >
> > Given this furious state of activity, we will skip our regular Friday meeting this week.
> >
> > Suggested activity: review presentation and public release of X3D4 Working Draft 2!
> >
> > * X3D Version 4 Overview
> >    https://www.web3d.org/x3d4
> >
> > * X3D Version 4 Draft: Ready for Early Adoption! presentation
> >    https://www.web3d.org/sites/default/files/page/X3D%20Version%204%20Overview/X3dVersion4Siggraph2020Brutzman.2020August3.pdf
> >
> > * X3D4 Public Working Draft Specification, second release
> >    https://www.web3d.org/x3dv4-public-working-draft
> >
> > As ever: all questions, feedback and improvement are welcome.  Have fun with X3D4!  8)
> >
> > 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 http://faculty.nps.edu/brutzman
> >
> > _______________________________________________
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> > consortium at web3d.org
> > http://web3d.org/mailman/listinfo/consortium_web3d.org
>
>
>
> --
> Andreas Plesch
> Waltham, MA 02453



-- 
Andreas Plesch
Waltham, MA 02453