[Opensim-users] Opensim nooby question on UUIDs

[Dr Ramesh Ramloll]

Thanks Dahlia for replying (on a Sunday night). This clears things a bit
for me. I was wondering if oars also contains UUIDs for those stuff that
need permanent UUIDs. Or are they regenerated, during import into a
completely different install of opensim?
Thanks again.
R


On Sun, May 5, 2013 at 7:48 PM, Dahlia Trimble <dahliatrimble at gmail.com>wrote:

> UUIDs can be temporary or permanent depending on what they are used for.
> In general they are used wherever a unique key is needed for accessing some
> other data. Assets such as textures or notecards are assigned permanent
> UUIDs, and temporary assets such as avatar baked textures get temporary
> UUIDs. UUIDs are used pervasively throughout OpenSimulator and are usually
> assigned by a random number generator. It's generally believed that the
> probability of 2 randomly generated UUIDs not being unique is so small that
> it will essentually never occur (UUIDs are essentially 128 bit integers) so
> they can be used freely without risk. Of course this all depends on the
> quality of the random number generator used to generate the UUIDs ;)
>
> There are also cases where UUIDs can be generated by a hashing algorithm.
> Usually in such cases this is used to detect and prevent duplicate data
> being stored, i.e., if several people upload the same texture, then only
> one copy of the texture need exist in an asset server that uses such a
> hashing scheme.
>
>
> On Sun, May 5, 2013 at 3:53 PM, Dr Ramesh Ramloll <r.ramloll at gmail.com>wrote:
>
>> Hello,
>> I understand that the UUID are unique only with respect to a given
>> session of the sim. Correct me if I am wrong. So UUIDs change, this can be
>> tested trivially.
>> But how do notecards save avatar appearance? This would suggest the UUIDs
>> of clothes or attachments would not change across sessions. So am a bit
>> confused about how notecard data containing UUID pointers still work in a
>> different session.
>> Thanks
>> Ramesh
>>
>> --
>> 'Consider how the lilies grow. They do not labor or spin.'
>> *Rameshsharma Ramloll* PhD, CEO CTO DeepSemaphore LLC, Affiliate *Research
>> Associate Professor*, Idaho State University, Pocatello, ID 83209 Tel:
>> 208-240-0040
>> Blog <http://deepsemaphore.posterous.com/>, LinkedIn<http://www.linkedin.com/in/rameshramloll>
>> , DeepSemaphore LLC <http://www.deepsemaphore.com>, Google+ profile<https://plus.google.com/103652369558830540272/about>
>>
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-- 
'Consider how the lilies grow. They do not labor or spin.'
*Rameshsharma Ramloll* PhD, CEO CTO DeepSemaphore LLC, Affiliate *Research
Associate Professor*, Idaho State University, Pocatello, ID 83209 Tel:
208-240-0040
Blog <http://deepsemaphore.posterous.com/>,
LinkedIn<http://www.linkedin.com/in/rameshramloll>
, DeepSemaphore LLC <http://www.deepsemaphore.com>, Google+
profile<https://plus.google.com/103652369558830540272/about>
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