[x3d-public] good example for ECMAScripting and Protos?

John Carlson yottzumm at gmail.com
Sun Aug 5 22:19:57 PDT 2018


Leonard, I agree my approach may not work in all environments.

Determining a valid or invalid mime type is extremely difficult if done
semantically, but extremely easy if done syntactically.  My guess is that
many of the X3D tags are semantically invalid, unless someone has added
them to Apache.   I do not know the status of this.   I have to add mine
types to my server for every new extension I add.  It is not a that big of
a deal.

One may not need a script tag around X3D script to execute X3D script.  One
may use eval in a script tag.   One may make script inconsequential by
making the scripts only functions, and move the functions to a string which
is evaled.  Essentially you are parsing twice.

If we want script fields handled by X3DOM, we will have to find someway to
bring them into X3DOM.  X_ITE has shown the way.   We can take other
approaches than X3DOM, like straight DOM.  I am beginning to think this is
preferable,  but using DEF to find node which aren’t in the scenegraph has
kind of been, wtf?

The question has become “Are DEFed SFNodes valid scenegraph objects if they
are in fields?” This may show a failing of X3DOM, which may need to be
corrected.  I can probably find the scengraph object using USE, but I
really want to use DEF.   Can someone show me how to do it in the HTML5
environment?

John
On Mon, Aug 6, 2018 at 12:24 AM Leonard Daly <Leonard.Daly at realism.com>
wrote:

> I am replying to an early message in this thread, but I hope to capture
> comments from all messages in the thread. My comments only apply to the web
> browser (HTML5) environment.
>
> First, any Script tag (in any case) will be handled by the web browser,
> and the web browser will parse content before anything else. If you really
> need to independently parse some tags, you will need to "read" it into a
> JavaScript variable and handle it that way. If it's in the page file, it
> will be parsed.
>
> There was a suggestion to use "text/x3dscript" or some other string. The
> W3C has something to say about this at
> https://www.w3.org/TR/html5/scripting-1.html#the-script-element. The
> value of the type attribute must either be
>
>    1. omitted
>    2. JavaScript MIME type
>    3. "module"
>    4. any other valid mime type
>
> So the use of an invalid MIME type is not technically valid HTML. This may
> cause a problem with some browsers or validators; or present future
> problems if that string is ever defined to have a particular meaning.
>
> X3DOM does not have X3D scripting. If you need scripting to correctly
> process an X3DOM environment; then you need to do it in HTML5 Javascript.
> X3DOM does not process the Script tag, that is done by HTML5. While X3DOM
> parser could recognize that tag, it does not; hence, none of the X3DOM
> methods are available to handle interactions on a Script node (a Script tag
> parsed into DOM).
>
> The X3D Script / HTML5 Script tag name conflict is a long-standing and
> known issue. To my knowledge no work has been done to break the conflict.
>
> Leonard Daly
>
>
>
>
>
> Here’s my current code for clearing the ECMAScript out of a X3D file so
> that it doesn’t show on the screen:
>
>
>
>
>
>                        $(selector+" Script").contents().filter(function ()
> {
>
>                             return this.nodeType === 3 || this.nodeType
> === 4;
>
>                        }).remove();
>
>
>
> This retains the fields.  I may change my code to work with fields instead
> of parsing out the fields into properties (but directOutput is nice).  This
> would mean that X3DOM has to route to and from the script fields (is this
> possible?).
>
>
>
> John
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
> *From: *John Carlson <yottzumm at gmail.com>
> *Sent: *Saturday, August 4, 2018 4:56 AM
> *To: *vmarchetti at kshell.com; X3D-Public <x3d-public at web3d.org>; x3dom
> mlist <x3dom-users at lists.sourceforge.net>; Andreas Plesch
> <andreasplesch at gmail.com>
> *Subject: *RE: [x3d-public] good example for ECMAScripting and Protos?
>
>
>
> I have a problem with this file in X3DOM, because as far as I can tell,
> the SFNode fields (the node, not the field) do not have getFieldValue for
> point etc. as a function, for example (but one can double check me).  In
> other words, I don’t think this node is an X3DOM node.
>
>
>
> Thus I cannot take a reasonable length in the script.  One would have to
> parse the string.
>
>
> That’s as clear as I can get.  I think this might be because x3dom does
> not process scripts correctly. We would need a script tag handler, and a
> field handler inside that.
>
>
>
> Can you help Andreas?  I’ve created a script tag before, but that code is
> lost. It might be in my GitHub repository somewhere, not sure.
>
>
>
> We just need a script tag that has fields, but doesn’t execute its CDATA
> section.  I am pretty sure
>
>
>
> How is V4.0 handling this?
>
>
>
> Alternatively, I can change my nodeUtil code to look at the type and do
> the right thing converting a string to the correct type.   Suggestions are
> welcome.
>
>
>
> Thanks for the great example, Vince,
>
>
>
> Should I adapt my code to deal with this failing in X3DOM, or should we
> change X3DOM?
>
>
>
> John
>
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
> *From: *vmarchetti at kshell.com
> *Sent: *Wednesday, August 1, 2018 9:04 PM
> *To: *John Carlson <yottzumm at gmail.com>; X3D-Public <x3d-public at web3d.org>
> *Subject: *Re: [x3d-public] good example for ECMAScripting and Protos?
>
>
>
> See
>
>
> http://www.kshell.com/pages/pointcloudvisualization/SphereDirectedPointSet.x3d
>
>
>
> It is a X3D file with with a Prototype + ecmascript definition of a point
> cloud, with a vector attached to each point of the cloud.
>
> Example used is just points randomly distributed on sphere with directs
> pointed radially outward.
>
>
>
> Potential uses would be to implement the scanning design pattern at
> http://x3dgraphics.com/examples/X3dForAdvancedModeling/Scanning/X3dMeshDesignPatternIndex.html
> , or
>
> visualizing fluid flow or  electromagnetic field
>
>
>
> On Jul 31, 2018, at 10:30 PM, John Carlson <yottzumm at gmail.com>
> <yottzumm at gmail.com> wrote:
>
>
>
> Is there a good example of ECMAScripting in X3D that I can use to test my
> X3D JSON ECMAScript preprocessor?  Preferably with Protos
>
>
>
>
>
> Thanks!
>
>
>
> John
>
>
>
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>
>
>
>
>
>
>
>
> _______________________________________________
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>
>
> --
> *Leonard Daly*
> 3D Systems & Cloud Consultant
> LA ACM SIGGRAPH Past Chair
> President, Daly Realism - *Creating the Future*
>
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