It's an age old problem and I don't think there's a right or wrong answer when it comes to loading assets synchronously or asynch. However, I believe it's important for the event model to support the notification of EXTERNPROTOs so that authors have better control of their worlds. We rely heavily on EXTERNPROTOs, some of which contain nested EXTERNPROTOs. Combine this with the variability of loading times over different networks, and it becomes difficult to predict the exact loading behavior of your model for different customers. We also rely heavily on the SAI for our control applications which stream real-time sensor data, from large scale underground mining equipment, into our 3D worlds - see attached image. Data is streamed from over a thousand kilometers through secure VPNs (24 x 7) into these models which we monitor remotely. It's important to know that the EXTERNPROTOs have loaded completely before we can start piping data into the Transforms (via the SAI) of the model. I would certainly support the browser object generating events for when EXTERNPROTOs are loaded. Cheers from Down Under. Con. -----Original Message----- From: owner-x3d-public@web3d.org [mailto:owner-x3d-public@web3d.org] On Behalf Of Tony Parisi Sent: Friday, 8 December 2006 2:57 AM To: 'Dave A'; 'Don Brutzman' Cc: www-vrml@web3d.org; x3d-public@web3d.org Subject: RE: [x3d-public] LoadSensors: create via SAI? Monitor an ExternProto? I remember discussing with Justin the possibility of the Browser object generating events for when EXTERNPROTOs are loaded. However I'm not sure anything came of that? I also recall that we removed the restriction requiring the EXTERNPROTO to be loaded synchronously before continuing processing the world. This in fact is the source of Dave's current dilemma. However I just took a look at the spec again, and I don't see any specific language defining whether EXTERNPROTO loading is synchronous, asynchronous or browser-defined. Anybody have any clues? Tony > -----Original Message----- > From: owner-x3d-public@web3d.org [mailto:owner-x3d-public@web3d.org] > On Behalf Of Dave A > Sent: Wednesday, December 06, 2006 11:49 PM > To: Don Brutzman > Cc: www-vrml@web3d.org; x3d-public@web3d.org > Subject: Re: [x3d-public] LoadSensors: create via SAI? Monitor an > ExternProto? > > Thanks, I'll see what I can do, great suggestion! > > Dave A > > Don Brutzman wrote: > > Dave A wrote: > >> I've futzed with this a bit, getting nowhere. > >> > >> Is there a way to use a LoadSensor to monitor the progress of an > >> ExternalProto? > > > > Here are two possibilities implementable today. > > > > - put a Script in the ProtoDeclare. solely give it an initialize() > > method that outputs an event. this is triggered once the > > ProtoInstance is loaded. the output event can be IS/connected to > > the proto interface for use in the scene. > > > > - depending on the resource involoved, might also use a LoadSensor > within > > the ProtoDeclare itself and similarly expose that output. > > > >> And more to the point, how would I create such a thing using SAI? > > > > no help here.. we really do need a lot more examples using SAI. > > > > all the best, Don > ---------------------------------------------------------------------- > --- > for list subscription/unsubscription, > go to http://www.web3d.org/cgi- > bin/public_list_signup/lwgate/listsavail.html > ------------------------------------------------------------------------ - for list subscription/unsubscription, go to http://www.web3d.org/cgi-bin/public_list_signup/lwgate/listsavail.html
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