Re: [www-vrml] Re: [Vrspace-dev] Cortona createVrmlFromURL bug test code

[Rob Meyers <rob@vrspace.org>]

> >
> > I posted the code at http://www.vrspace.org/downloads/CortonaTest.zip .
>
> 404.

   Try again, was called CortonaTest.ZIP on server, oops.

> >    Incidentally, I did notice another bug, but in Contact.  It seems
> > that Contact doesn't always call the callback function after processing
> > a removeChildren event.  On the other hand, Cortona seems to do this
> > correctly.
>
> Absent the code, let me see if I understand this...
>
> So the callback is supposed to happen once the resource has been loaded;
> but you're calling createVrmlFromURL frequently enough that it hasn't
> finished loading one resource before you request another. And in this
> case Cortona effectively interrupts loading of the previously requested
> resource; the field value of the destination node (effectively) never
> changes; and so you never get your callback.

     Negative, the object is always loaded into the scene, but sometimes 
there is no callback.
You make twenty calls, you get twenty objects, but only about 10 callbacks 
(its random)...


> I don't have a copy of the Marrin EAI spec handy; but here's what the
> VRML97 spec says about Browser.createVrmlFromURL (4.12.10.10):
>
>         The createVrmlFromURL() instructs the browser to load a VRML
>         scene description from the given URL or URLs. The VRML file
>         referred to shall be self-contained (i.e., USE statements inside
>         the string may refer only to nodes DEF'ed in the string, and
>         non-built-in node types used by the string shall be prototyped
>         using EXTERNPROTO or PROTO statements inside the string). After
>         the scene is loaded, event is sent to the passed node returning
>         the root nodes of the corresponding VRML scene. The event
>         parameter contains a string naming an MFNode eventIn on the
>         passed node.
>
> If the callback is supposed to happen "after the scene is loaded" and
> the scene is never loaded, presumably the callback would never happen.
> So Cortona's behavior strikes me as reasonable.

     See above.

> Perhaps you should be structuring your code only to make a subsequent
> call to createVrmlFromURL after getting the callback from a previous
> one.

     As a note, this would be awful.  Loading a big space sequentially can 
take
big time.  Our spaces are composed of lots of little files, so 
simultaneously downloads is
essential.

     Regards,
    Rob

> --
> Braden McDaniel                           e-mail: <braden@endoframe.com>
> <http://endoframe.com>                   Jabber: <braden@jabber.org>
>
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