[x3d-public] [x3dom-users] Cobweb_dom...Script Magic? Loading DOM subscenes after parent in X3DOM and Cobweb. ALMOST complete, requires sequencing of outer functions.

Leonard Daly Leonard.Daly at realism.com
Sat May 20 21:17:01 PDT 2017


John,

I don't really like to answer this way, but why?

X3DOM does not have Proto/ExternProto feature. It does not have X3D 
Script node. The integration with HTML is too close to allow an X3D 
Script node. HTML JavaScript (via DOM and X3D node manipulation) is 
available and used extensively. X3DOM does not handle VRML (meaning a 
text file with {} syntax). There is an unofficial JSON loader. Perhaps 
you have one too. How does it get the scene graph into DOM? Does it 
create DOM elements (or perhaps an HTML text string which is then 
parsed)? Something else?

To the extent I understand your question, you are asking for help in 
constructing a means of handling X3D Script node in X3DOM. Once that is 
done, Proto/ExternProto would be next. This would all come into the 
browser through an JSON encoded file. It seems to me that trying to 
handle X3D Script code requires an entire infrastructure supporting the 
X3D event mode and calling script code with X3D arguments. It also 
requires building full support for SAI and supporting the 'directOutput' 
field. That is a major effort with no obvious purpose that I see in V4.

You are asking for some serious time support (I think) into an 
application that is neither fully X3D-compliant, nor DOM-compliant (but 
the closest to both that is available). At least for me, I do not 
understand how this effort would further an X3D integrated DOM system. I 
am quite willing to listen to your reasons and help where I can, but I 
would like to see where this is going first.

Leonard Daly

P.S.  Everything above is for client-side code. Server side code can 
manipulate things as much as it wants to create something that runs in a 
client-side browser.

P.P.S. I do think there is a need to JSON encoding in V4 subject to the 
node definition for V4.



> Yes, Leonard, for quite some time I have an X3D JSON 
> PROTOtypeExpander.js that works with X3D PROTOs and EXTERNPROTOs and 
> displays in X3DOM.  I don’t know how complete it is, and testers are 
> welcome. My EXTERNPROTO expander runs on the server, so is not 
> included in the message, but it is included in the link in the 
> original message.  If someone can make the EXTERNPROTO expander work 
> client side that would be great.
>
> The EXTERNPROTO expander is generally called like:
>
>                 json = externPrototypeExpander(outfile, json);
>
> Where json is the parent json of the extern, and outfile is the parent 
> X3D file being loaded (I think “” will probably do in a pinch.  I am 
> not sure.).  The extern PROTOs will be included in the original JSON 
> as a ProtoDeclare object.  You may have to run the flattener 
> afterwards, and it is run as:
>
> json = flattener(json);
>
> It removes empty objects from the JSON.
>
> Yes, I would like someone to help me with VRMLScript for X3DOM, if 
> someone is available.  I have a very barebones and incorrect 
> implementation here:
>
> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/Script.js
>
> Please help.  I don’t know the X3D event model, and I’m not likely to 
> learn soon.  The X3D event model can be emulated in Browser-side 
> JavaScript, but there’s only Cobweb for proof.
>
>
> I have another version of flipper.html here that works with X3DOM and 
> Cobweb adding the subscene later.  It works with Promises, but the 
> functions still aren’t separated…close, but no cigar.  Take a look:
>
> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/html/flipper.html
>
> Sorry, I tend to use the XML version of “Proto”, and not the VRML “PROTO”.
>
> X3DJSONLD provides an infrastructure for X3D JSON Browser development, 
> including X3D XML -> X3D JSON conversion on the server, and X3D JSON 
> to X3D XML loading into X3DOM and Cobweb.  It also includes 
> conversions from XML DOM to Java and Nashorn JavaScript for X3DJSAIL 
> app development.
>
> There is definite potential for an XML PROTO expander, as I have 
> written this code, but not seriously tested:
>
> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/CompleteXMLPrototypeExpander.js
>
> So far, it’s still server-side.  If you’re going to modify it, split 
> it into server and client-side pieces, please.  Complete is probably a 
> misnomer…
>
> Thanks,
>
> John
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10
>
> *From: *Leonard Daly <mailto:Leonard.Daly at realism.com>
> *Sent: *Saturday, May 20, 2017 7:17 PM
> *To: *John Carlson <mailto:yottzumm at gmail.com>; Andreas Plesch 
> <mailto:andreasplesch at gmail.com>; holger.seelig at yahoo.de 
> <mailto:holger.seelig at yahoo.de>
> *Cc: *x3dom-users at lists.sourceforge.net 
> <mailto:x3dom-users at lists.sourceforge.net>; X3D Graphics public 
> mailing list <mailto:x3d-public at web3d.org>
> *Subject: *Re: [x3dom-users] Cobweb_dom...Script Magic? Loading DOM 
> subscenesafter parent in X3DOM and Cobweb.
>
> John,
>
>     Cobweb_dom, X3DOM experts, I need some help adding a child DOM
>     scenegraph with prototypes to a parent DOM scenegraph after the
>
>
> Not sure how any of this applies to X3DOM as it does not have PROTOs. 
> Assuming you mean X3D prototypes via PROTO or EXTERNPROTO. If you mean 
> something else, please elaborate.
>
>
> Leonard Daly
>
>
>
>
>     primary scene has been  loaded, and not before. I have an example
>     of loading before the scene is loaded, and in a callback.  If you
>     have an example with Promises instead of callback nesting, that
>     would be more ideal, the second $.getJSON() (child scenegraph)
>     might finish before the first $.getJSON() (parent scenegraph) if I
>     don’t use promises or callback nesting. Also, Promises would allow
>     me to separate the parent loading somewhat from the child loading,
>     and create separate functions.  Also, X3DOM experts can provide an
>     example with Promises as well. Meanwhile, I will be reading about
>     Promises.
>
>     Here is my example so far:
>
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/html/flipper.html
>
>     Viewable here:
>
>     https://coderextreme.net/X3DJSONLD/src/main/html/flipper.html
>
>     The white Box is the subscene of the dolphin scene.
>
>     The following related code is from
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/loaderJQuery.js
>
>     and references code from:
>
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/X3DJSONLD.js
>
>     [ actually, I think the last two reference each other – naughty ]
>
>     Data is here:
>
>     [ child scenegraph ]
>
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/data/abox.json
>
>     [ parent scenegraph ]
>
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/data/flipp.json
>
>     Cobweb doesn’t need the prototypeExpander or the flattener (well,
>     it might have with prototypes in cobweb_dom, but I think the last
>     release fixed that…haven’t checked—here is a good test for you!). 
>     This is a dual example, and I haven’t figured out how to
>     conditionally run the prototypeExpander on only X3DOM code. 
>     Please test without the PrototypeExpander.js and Flattener.js
>     included, and remove X3DOM, since it won’t work in that case. 
>     X3DOM folks can include the two JavaScript files which are here:
>
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/PrototypeExpander.js
>
>     https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/Flattener.js
>
>     You may provide your own appendInline (below) which doesn’t call
>     loadSchema.  That may be too complex of a download.  That is, you
>     probably don’t want to do all that JSON schema validation in your
>     example.  Try to keep my code close to what it is otherwise.
>
>     And if you start supporting X3D JSON in your viewers, that would
>     be even better!
>
>     John
>
>     /**
>
>     ·Next is passed the element parameter
>
>     ·*/
>
>     function appendInline(element, url, next) {
>
>     $.getJSON(url, function(json) {
>
>     if (typeof prototypeExpander === 'function') {
>
>     json = prototypeExpander(url, json, "");
>
>     } else {
>
>     console.error("Perhaps you need to include the
>     PrototypeExpander.js?");
>
>              }
>
>     if (typeof flattener === 'function') {
>
>     json = flattener(json);
>
>     } else {
>
>     console.error("Perhaps you need to include the Flattener.js?");
>
>     }
>
>          // must validate here because we call an inner method.
>
>     loadSchema(json, url, doValidate, function() {
>
>     ConvertToX3DOM(json["X3D"]["Scene"], "Scene", element, url);
>
>     next(element);
>
>            }, function(e) {
>
>     console.error(e);
>
>     });
>
>     }).fail(function(jqXHR, textStatus, errorThrown) { alert('getJSON
>     request failed! ' + textStatus + ' ' + errorThrown); });
>
>     }
>
>     /**
>
>     ·Next is passed the selected element from selector
>
>     ·Selector is the CSS selector to append inline to.
>
>     ·*/
>
>     function loadSubscene(selector, url, next) {
>
>     appendInline(document.querySelector(selector), url, next);
>
>     }
>
>
>
>
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> -- 
> *Leonard Daly*
> 3D Systems & Cloud Consultant
> LA ACM SIGGRAPH Chair
> President, Daly Realism - /Creating the Future/
>

-- 
*Leonard Daly*
3D Systems & Cloud Consultant
LA ACM SIGGRAPH Chair
President, Daly Realism - /Creating the Future/
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