[x3d-public] Script node implementation questions

Sat Aug 15 10:23:42 PDT 2020

Well, the first video was the first time I had focused on triggers and
sequencers.

Can I have a float-random-sequencer?   Is that an emitter?

John

On Sat, Aug 15, 2020 at 11:38 AM Don Brutzman <brutzman at nps.edu> wrote:

> Thanks for your continuing efforts.  Tricky business, but... we only have
> to get it right once and then it works for everyone.  Plus multiple
> open-source implementations exist.
>
>
>
> On 8/14/2020 6:12 PM, John Carlson wrote:
>
> >
>
> > Is there an IS (International Standard), as opposed to a CD (Committee
> Draft?)?
>
>
>
> On the Web3D Consortium's Recommended Standards page, a legend table
> appears at the bottom that explains the acronyms:
>
>
>
> [1] Recommended Standards
>
>      https://www.web3d.org/standards
>
>
>
> CD      Committee Draft
>
>         First vote with technical comments on proposed standard or
> revision.
>
> DIS     (was FCD) Draft International Standard (was Final Committee Draft)
>
>         Last vote with technical comments on proposed standard or revision.
>
> FDIS    Final Draft International Standard
>
>         Last ISO vote on proposed standard or revision. This is a Yes/No
> vote only.
>
> IS      International Standard
>
>         Approved and published standard or revision.
>
>
>
> Then listed above, row by row, are entries for each recommended standard.
> Of interest here:
>
>
>
> 19777-1 ISO/IEC CD 19777-1:201x
>
>         V3.3
>
>         X3D Language Bindings : ECMAScript (JavaScript)
>
>         CD 2014-09-05
>
>         HTML
> https://www.web3d.org/documents/specifications/19777-1/V3.3/index.html
>
>         ZIP
> https://www.web3d.org/documents/specifications/19777-1/V3.3/ISO-IEC-19777-1-CD-V3.3.zip
>
>
>
> > I was guessing once I got field support working, that events would be
> automatic? Not really sure...  I guess I'll have to do the set_, _changed
> stuff, but I'm not really sure.  Maybe I should do initializing in the
> initialize() method?
>
>
>
> Guessing is not possible, unless you have language-algorithm ESP maybe...
> Reading the specification is how to be sure.
>
>
>
> In scripts, the initialize() method is automatically called first, and the
> shutdown() method is automatically called last.
>
>
>
> Three ! specifications describe functionality: X3D Architecture, X3D Scene
> Access Interface, and the Ecmascript language binding.
>
>
>
> Recommend reading them, key sections follow.
>
>
>
> [2.1] X3D Abstract : Node Definitions, with formal title
>
>        X3D Part 1: Architecture and base components
>
>
>
>         4.4.2.2 Field semantics
>
>
> https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/concepts.html#FieldSemantics
>
>
>
>         4.4.2.4 Modifying objects
>
>
> https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/concepts.html#Modifyingobjects
>
>
>
>         4.4.8 Event model
>
>
> https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/concepts.html#Eventmodel
>
>
>
>         29.2 Scripting component, concepts
>
>
> https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/scripting.html#Concepts
>
>
>
> [2.2] 19775-2 X3D Abstract : Scene Access Interface (SAI), with formal
> title
>
>        19775-2 X3D Part 2: Scene access interface (SAI)
>
>
> https://www.web3d.org/documents/specifications/19775-2/V3.3/Part02/X3D_SAI.html
>
>
>
>         4.4.8 Node and node lifecycle
>
>
> https://www.web3d.org/documents/specifications/19775-2/V3.3/Part02/concepts.html#Node
>
>
>
>         4.4.9 Field
>
>
> https://www.web3d.org/documents/specifications/19775-2/V3.3/Part02/concepts.html#Field
>
>
>
> [2.3] X3D language bindings, Part 1: ECMAScript
>
>
> https://www.web3d.org/documents/specifications/19777-1/V3.3/index.html
>
>
>
>         5.2.11 Script content services
>
>
> https://www.web3d.org/documents/specifications/19777-1/V3.3/Part1/tables.html#ScriptServices
>
>
>
> Whew, that is a lot.  All together now, presented in different ways
> (examples, book, slides, videos):
>
>
>
> [3.1] X3D Example Archives: X3D for Web Authors, Chapter 09 Event
> Utilities Scripting
>
>
> https://x3dgraphics.com/examples/X3dForWebAuthors/Chapter09EventUtilitiesScripting
>
>
>
> [3.2] X3D For Web Authors, Chapter 9, Event Utilities and Scripting
>
>        http://x3dgraphics.com
>
>
>
> [3.3] Chapter 9, Event Utilities and Scripting, slideset
>
>
> http://x3dgraphics.com/slidesets/X3dForWebAuthors/Chapter09EventUtilitiesScripting.pdf
>
>
>
> [3.4] YouTube course videos: Chapter 9, Event Utilities and Scripting
>
>
> https://www.youtube.com/playlist?list=PLuSIsM-86sik26mcDz0w_wdFXOUp56FTr
>
>
>
> And as you've seen, simplest summaries (including Hints and Warnings) are
> found at
>
>
>
> [4.0] X3D Tooltips: Script
>
>        https://www.web3d.org/x3d/content/X3dTooltips.html#Script
>
>
>
> > I haven't figured out how to call shutdown() yet. document.onunload?
>
> >
>
> > It would seem like if I copied field stuff from Composed Shader/Shader
> Part, that I would get the default fields?  I am not really sure.
>
> > Should I look at Andreas' ProtoDeclare? Are there other places with
> fields?
>
>
>
> Prototypes can contain Script nodes so however this is implemented needs
> to be compatible.  The design of fields and events are identical, with
> prototypes holding more involved capabilities for extensibility.
>
>
>
> ... so yes, you need to align well with Andreas' ProtoDeclare.  The only
> other nodes with fields are the Shader nodes, and they are slight
> variations on Script.
>
>
>
> > Thanks,
>
> >
>
> > John
>
>
>
> Likewise, further questions welcome.  These are worthy efforts!  Good luck
> with your important efforts.
>
>
>
> 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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