[x3d-public] LoadSensor completion of loading

[Holger Seelig]

I think, and it is how it is now implemented in X_ITE, Inline nodes are loaded, if they are completely loaded with all it sub scenes. This makes it easier for an X3D author to to determine if all is loaded, otherwise the author must traverse the scene, or do other logic, to determine if sub Inline scenes are loaded. I makes sense that, that an Inline is loaded when it is completely loaded.

Best regrads,
Holger

> Am 21.12.2022 um 17:50 schrieb Andreas Plesch <andreasplesch at gmail.com>:
> 
> It is useful to be notified after an Inline has completed loading.
> This is especially true for external access to the scene if the Inline
> has exports (or dom style access is used).
> A LoadSensor generates such an event:
> 
> https://www.web3d.org/documents/specifications/19775-1/V4.0/Part01/components/networking.html#LoadSensor
> 
> "The isLoaded field generates events when loading of the LoadSensor's
> children has completed."
> 
> However, in the case that the Inline contains another Inline itself a
> question came up. Is loading considered complete when the outer Inline
> xml/json/.. is completely downloaded but still has only a url
> reference to the inner Inline ? That typically would happen before
> also the inner Inline is completely downloaded. Or should the event be
> generated only after the inner Inline (and all of its content) is also
> completely downloaded ?
> 
> The second option is more useful, especially for web use where loading
> generally occurs asynchronously and such events are often used to
> initiate processing of downloaded content.
> 
> For generic X3D use, one could imagine a situation where a LoadSensor
> triggers something which assumes that the scene is fully rendered
> before an Inline is actually rendered.
> 
> It is also related to how EXPORT/IMPORT works. One could probably
> construct a situation where a LoadSensor triggers access to an
> EXPORTed node from an inner Inline before it is available.
> 
> Is a tightening of the language necessary ? Perhaps there is already a
> more precise definition of 'loading' in the spec. somewhere else ?
> 
> -Andreas
> -- 
> Andreas Plesch
> Waltham, MA 02453
> 
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