[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
Mon May 22 07:41:30 PDT 2017
Why make scripts optional? Yes, perhaps other languages besides JavaScript should be optional, but at least JavaScript X3D scripts should be included if we have to use eval and other tricks. If they don’t initially support SAI, and deal with DOM directly, is that a bad thing? If you want to make DOM part of or replace SAI, that’s OK by me, but make X3D Script ROUTEing at least work in X3DOM, please. I don’t really need Proto’s implemented because of my Proto Expander.
Scripts have been implemented by Cobweb. Why not by someone else? I really would like to route to and from an X3D Script please.
So for me, ROUTEing with Scripts are vitally important to getting my expanded protos (that is, no protos) working.
If you have a way to convert X3D Script ROUTEs to HTML and JavaScript please let us know. That’s what I want implemented.
John
Sent from Mail for Windows 10
From: Leonard Daly
Sent: Monday, May 22, 2017 10:06 AM
To: John Carlson
Cc: X3D Graphics public mailing list; x3dom-users at lists.sourceforge.net; Andreas Plesch; holger.seelig at yahoo.de
Subject: Re: [x3dom-users] Cobweb_dom...Script Magic? Loading DOM subscenesafter parent in X3DOM and Cobweb. ALMOST complete, requires sequencing ofouter functions.
John,
I have not been convinced that Protos need to exist in an HTML environment. Scripts are an integral piece of the Proto architecture so if you path is to implement Protos on the way to implementing Scripts, you need to solve the entire Script problem first. If Scripts are optional, then why have Proto? I think something like a macro expansion can solve all of the use cases where Proto would be used while being lighter weight and easier to implement and possibly use.
Leonard Daly
Leonard, I believe Scripts should be implemented AFTER Protos. Just my opinion. Once the Protos and the ROUTEs and the Scripts are expanded with the new DEFs, then you apply the event model. This makes things easier, but takes more memory. Then you optimize. Beware premature optimization.
John
On May 21, 2017 12:16 AM, "Leonard Daly" <Leonard.Daly at realism.com> wrote:
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 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
--
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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