[x3d-public] node-java X3DJSAIL and 1 example that works, and one that doesn't

[John Carlson]

So it seems like the only problem with creating node.js External SAI for
X_ITE is getting the X3D object/function, and perhaps some things as you
mentioned, a node.js DOM package?  One should be able to look at X3DJSONLD
for ways to get the xmldom or jsdom module. Or should we proceed assuming a
browser will be available (run a headless browser).

Should I revert the nodejs project to use createNode yet?  And we can
proceed with my previous SAI HelloWorld example by getting rid of add and
set functions, instead of going down Transform and X3DJSAIL rabbit holes?

Should I revisit Scripts.js (Script processor) for converting VRMLScript
for X3DOM?

Thanks,

John

On Sat, Apr 11, 2020 at 8:40 AM Andreas Plesch <andreasplesch at gmail.com>
wrote:

> Hi John,
>
> x_ite just follows standard SAI, internal or external:
>
> //get Browser
> browser=X3D.getBrowser(); //X3D is global defined by x_ite.js
> //get current scene
> scene=browser.currentScene;
> //make shape node
> shape=scene.createNode('Shape');
> //make box node
> box=scene.createNode('Box');
> //set geometry field
> shape.geometry=box;
> //add as root node (for example)
> scene.addRootNode(shape);
>
> For me the easiest way to experiment with scripting like this, is to
> use the Chrome dev tools console with a simple scene like:
>
> https://www.web3d.org/x3d/content/examples/Basic/UniversalMediaPanoramas/desert3X_ITE.html
> Following the steps will give you a white box visible in the active scene.
>
> x3dom uses the DOM as an interface to the scene. So you create DOM
> elements using HTML5 methods and add those to the Scene DOM element.
> There may be a way to avoid using the DOM and use internal, SAI like
> functions. For example, the javascript domNode._x3dom property gives
> you access to fields and methods for a node. But usually it is easiest
> and most interoperable on a HTML5 page to use the DOM.
>
> The field names are the same across browser but the internal
> representation of field values (as a javascript object) is very
> different. So one cannot use the results of SAI x_ite calls directly
> with x3dom, or vice versa. It is necesssary to go through encodings.
>
> I do not think X3DJSAIL deals a lot with Browser or ExecutionContext
> SAI functions since they are tied to the specific browser but I may be
> wrong.
>
> Andreas
>
> On Sat, Apr 11, 2020 at 2:58 AM John Carlson <yottzumm at gmail.com> wrote:
> >
> > Could Andreas explain how to use createNode in the context of X_ITE SAI?
> > I think that createNode may be the one significant thing missing from
> X3DOM SAI.
> > There's an unrelated one in the physics code.
> >
> > That is, you use createNode to createNodes in SAI, then you use the
> fields of the returned object.  Are these the same across browsers?
> >
> > Here's how to get a node from the standard:
> >
> > Browser.currentScene.createNode('Shape');
> >
> > Again, there is no createNode in X3DJSAIL to speak of.
> >
> > Thanks,
> >
> > John
> >
> > On Sat, Apr 11, 2020 at 1:24 AM John Carlson <yottzumm at gmail.com> wrote:
> >>
> >> We have 2 versions of  JavaScript server side API, Nashorn and Node,
> both dependent on X3DJSAIL, and the code looks similar.  However, we do not
> have a JavaScript native version yet, even with JSweet (it's incomplete).
> >>
> >> I believe that we should pursue an external SAI compatible with X_ITE,
> since X3DOM already has an external SAI.
> >>
> >> Below is an example of "External" with X_ITE. Note that X3D is required
> to be defined, and x_ite.js should be loaded before X3D is called.  So how
> do we do that in node?  This is why I've been suggesting headless browsers!
> >>
> >> ...so...I need to figure out an example of Transform in the standard.
> It would seem like the thing to do would be to implement createNode?  Are
> there any examples of createNode?  Yes, in X_ITE at least.  Do we need to
> create an execution context to use it?  Yes!
> >>
> >> Is there an X_ITE example of external createNode?
> >>
> >> Yes!
> >>
> >> As far as I can tell there is not a X3DOM version of ECMAScript SAI's
> createNode.
> >>
> >> So I think we should start with X_ITE as I said before, and try to
> create an External ECMAScript SAI script (not DOM).
> >>
> >> Do people agree that we should try to create an ECMAScript SAI example
> from outside X_ITE?
> >>
> >> It appears that we either have to start from X3D(), below.   Can we
> make X3D() into an external SAI?
> >>
> >> Do we need a browser in nodejs?
> >>
> >> has anyone looked into chrome embedded framework?
> >>
> >> John
> >>
> >>
> >>
> >>
> -----------------------------------------------------------------------------
> >> function load_X_ITE_XML(content, selector) {
> >>         X3D(function() {
> >>                 var browser = X3D.getBrowser(selector);
> >>
>  browser.replaceWorld(browser.createX3DFromString(content));
> >>         }, function() {
> >>                 alert("Failed to render XML to X_ITE");
> >>         });
> >> }
> >>
> >> function load_X_ITE_DOM(element, selector) {
> >>         X3D(function() {
> >>                 if (typeof X3D.getBrowser !== 'undefined') {
> >>                         var browser = X3D.getBrowser(selector);
> >>                         if (typeof browser !== 'undefined' && typeof
> browser.importDocument !== 'undefined') {
> >>                                 var importedScene =
> browser.importDocument(element);
> >>                                 browser.replaceWorld(importedScene);
> >>                         }
> >>                 }
> >>         }, function() {
> >>                 alert("Failed to render DOM to X_ITE");
> >>         });
> >> }
> >>
> >> function load_X_ITE_JS(jsobj, selector) {
> >>         X3D(function() {
> >>                 if (typeof X3D.getBrowser !== 'undefined') {
> >>                         var browser = X3D.getBrowser(selector);
> >>                         if (typeof browser !== 'undefined' && typeof
> browser.importJS !== 'undefined') {
> >>                                 var importedScene =
> browser.importJS(jsobj);
> >>                                 browser.replaceWorld(importedScene);
> >>                         }
> >>                 }
> >>         }, function() {
> >>                 alert("Failed to render JSON to X_ITE");
> >>         });
> >> }
> >>
> -------------------------------------------------------------------------------------------------------------
> >> John
>
>
>
> --
> Andreas Plesch
> Waltham, MA 02453
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://web3d.org/pipermail/x3d-public_web3d.org/attachments/20200411/3edd2c48/attachment-0001.html>