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

Sat May 20 17:30:53 PDT 2017

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 for Windows 10

From: Leonard Daly
Sent: Saturday, May 20, 2017 7:17 PM
To: John Carlson; Andreas Plesch; holger.seelig at yahoo.de
Cc: x3dom-users at lists.sourceforge.net; X3D Graphics public mailing list
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 

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