Object GUID is persistent, but not granular enough. I've run into cases where multiple items get the same GUID. Same goes for CLSID.
Matt From: [email protected] [mailto:[email protected]] On Behalf Of Ciaran Moloney Sent: Tuesday, June 04, 2013 3:55 PM To: [email protected] Subject: Re: Persistent objects ids Yes, you're right...I can reproduce a change of ID when deleting an object and re-opening a scene. However, I would not dismiss the object GUID, which appears to persists between sessions despite the change in the object ID value. In the below snippet the sphere object changed ID but not GUID. # Name: cylinder # ID: 114 # GUID: {090F2A9A-D1FC-4112-ACC5-9345BEB48954} # # Name: disc # ID: 92 # GUID: {D03EF191-3962-4540-929D-F5438CE59D79} # # Name: torus1 # ID: 68 # GUID: {1AC14CC7-1175-4E30-9CDD-BC0C0C1DE6EA} # # Name: sphere # ID: 80 # GUID: {CC63558A-D5A3-4F55-8621-6D428FE2743A} # -------------------- # Delete cylinder, save and re-open scene # Name: disc # ID: 92 # GUID: {D03EF191-3962-4540-929D-F5438CE59D79} # # Name: torus1 # ID: 69 # GUID: {1AC14CC7-1175-4E30-9CDD-BC0C0C1DE6EA} # # Name: sphere # ID: 99 # GUID: {CC63558A-D5A3-4F55-8621-6D428FE2743A} # # -------------------- On Tue, Jun 4, 2013 at 6:38 PM, Matt Lind <[email protected]<mailto:[email protected]>> wrote: This is not safe between sessions as IDs are dynamically generated and assigned in the order objects were created in the scene. If an older object is deleted and the scene reopened, everything after it will have a new ID. Matt From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Ciaran Moloney Sent: Tuesday, June 04, 2013 8:52 AM To: [email protected]<mailto:[email protected]> Subject: Re: Persistent objects ids Hi, did you try XSIUtils.DataRepository.GetIdentifier() passing the siObjectGUID argument? I've used this to keep track of ICE nodes without relying on name strings. It's persistent between sessions and is preserved when models are exported. Works like a charm. The only problem is that it's possibly a bit tricky to get a pointer back to the object, since you need to know what you're looking for. I use Application.FindObjects() to get a collection of objects of this class, then check for the ObjectGUID I'm looking for. Ciaran On Tue, Jun 4, 2013 at 12:49 PM, Michal Doniec <[email protected]<mailto:[email protected]>> wrote: Hi, Is there any obvious way I am missing which would allow me to identify objects in the scene, but not by name? Something like ObjectID, but persistent between scene saves and loads. I can generate UUID or something similar using "ObjectAdded" event and store custom property but I'd rather avoid it. I want to be able to track objects regardless if they were renamed or not. -- ---------- Michal http://uk.linkedin.com/in/mdoniec
