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

John Carlson yottzumm at gmail.com
Wed May 31 12:30:34 PDT 2017

X3DOM does not have Proto/ExternProto feature.

big weakness thatwe may be able to fix.

>John essentially fixed this with the expander, I believe.

Well, still needs more testing.  Gears doesn’t work, but I think that’s due to the event model not being implemented—not sure.
It does not have X3D Script node.

BIg weakness we should be able to fix

Except we need to port the event model.

>Well, although cobweb and its dom integration cobweb-dom show that it is possible have both, DOM scripts along with x3d scripts, it is important to keep in mind that cobweb was developed as a strict x3d browser, whereas x3dom was never intended to work with x3d script nodes and user (x3d scene) defined fields. So while it may be perhaps possible to allow X3D script nodes in x3dom, it will probably require a pretty messy solution and/or a large effort with not too enjoyable mind twisting.

Working on it.  Need to implement the event model, and get rid of the visual script on the page.  Solution seems doable, just need to work on getting scripts ported to X3DOM’s flavor for the most part.  Proxy for script variables will be a big thing to implement for the event model.  Each Script will have a constructor function and at least one object (possibly more for Protos).

WIP Here, with some successes with the DOM (not XML currently).  https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/Script.js

Testing environment here:


X3DOM appears below the “X3Dautoclass.js” on the bottom left.  This is due to the script pushing the rendering down.

Good examples:

../data/SFVec3f.json  ../data/cobweb.json

Working on porting others to X3DOM style coding.



----- Original Message ----- From: "Leonard Daly" <Leonard.Daly at realism.com>
To: "John Carlson" <yottzumm at gmail.com>; "Andreas Plesch" <andreasplesch at gmail.com>; <holger.seelig at yahoo.de>
Cc: <x3dom-users at lists.sourceforge.net>; "X3D Graphics public mailing list" <x3d-public at web3d.org>
Sent: Saturday, May 20, 2017 9:17 PM
Subject: Re: [x3dom-users] Cobweb_dom...Script Magic? Loading DOM subscenes after parent in X3DOM and Cobweb. ALMOST complete, requires sequencing of outer functions.


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:


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:


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:


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



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*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.


    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

    Here is my example so far:


    Viewable here:


    The white Box is the subscene of the dolphin scene.

    The following related code is from


    and references code from:


    [ actually, I think the last two reference each other – naughty ]

    Data is here:

    [ child scenegraph ]


    [ parent scenegraph ]


    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:



    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!



    ·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


    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);


           }, function(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
President, Daly Realism - /Creating the Future/

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


Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot


X3dom-users mailing list
X3dom-users at lists.sourceforge.net

Andreas Plesch
39 Barbara Rd.
Waltham, MA 02453

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